Real Questions and latest syllabus of 1K0-002 exam

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Exam Code: 1K0-002 Practice test 2022 by team
Polycom CVE-2 Questions and Answers
Killexams : Polycom CVE-2 mock test - BingNews Search results Killexams : Polycom CVE-2 mock test - BingNews Killexams : mock test from the ‘Car Doctor’

Q. I have a 1998 Ford Crown Victoria that is losing coolant, I have checked the system for leaks and haven’t found any. Even after being parked for a few days there are no wet spots on the ground. The oil is clean with no signs of no moisture in it. I am adding about a quart of coolant a week, what is the issue.

A. The problem is most likely a leaking cylinder head gasket. The standard procedure is to pressure test the cooling system and if the system holds pressure, then the next step is to look for an internal leak. You can purchase a kit that uses a special chemical to look for exhaust gases in the cooling system. These kits are $35-$50 and are easy to use and quite accurate.

Q. My daughter has a 2007 Toyota Camry Hybrid. Lately the car has started to vibrate/slide as she brakes, as if the ABS system is engaging even though the road is clear and dry. The light with the squiggly lines will appear briefly. No other lights activate. Our mechanic has been able to experience the issue but has not been able to fix the issue. Any advice?

A. The anti-lock brake system uses sensors at each wheel that monitor wheel rotation. What you describe as a phantom ABS application can usually be traced to a rusted or cracked ABS tone wheel. A careful inspection and some testing should be able to pinpoint the problem.

Q. My Mazda 2014 CX-9 has about 55,000 miles on it. During a couple of four-hour drives on the highway I noticed a hum coming from the car. After some novice detective work figured it to be the right rear wheel bearing/hub was the problem. I removed the assembly and replaced it with a “sorry to say” economy brand part I purchased online. I road tested it and for about 300 miles of highway driving, no sounds. Unfortunately, after a few hundred more miles the same “hum” is back, although less intense. I did more internet research, and some comments were that this brand failed prematurely. And other sites mentioned a bit of a sophisticated install process. The replacement of this bearing hub is straightforward: remove defective part and install replacement. Four bolts hold the assembly to the rear axle assembly, and you just remove and reinstall the axel nut. Mixed recommendations on the torque specs for the axel nut: 200ftlbs/258ftlbs. Do you think I just got a lemon part? Did I install it incorrectly? Not like the old days when you’d repack the wheel bearings and “set” them with rotating the wheel and tightening and backing off the holding nut.

A. I suspect you may have gotten an inferior part. You are correct the replacement of the bearing is fairly simple. According to AllData the technical database I use, the attachment bolts should be tightened to 58–75-foot pounds and the axle nut is tightened to 175-202 foot pounds of torque.

Q. I have three simple questions that I can’t get an answer for so I’m coming to you. What window wash fluid do you recommend, especially in the cold Northeast states, are there any window treatment products do you recommend that shed water or prevent fogging and are gas additives worth the money? My car is a 2015 Kia Soul, but I’m sure the advice applies to most cars.

A. When choosing windshield washer fluid (which is basically soap, water and alcohol) look for fluid that will protect against freezing to at least 20 degrees below zero. Some fluids will have additives that do a better job of removing bugs and other debris and some will bead water. What ever fluid you choose, the best results come from a clean windshield. Clean the windshield inside and out with a good quality window cleaner and then go over the windshield with a clean microfiber cloth. Regarding window treatments, I have tried some and had mixed results, so I tend to stay away from them. If you are trying to prevent fogging, first make sure your defroster is set to fresh air. Fogging happens when there is a temperature differential of the inside and outside of the windshield. A DIY method to prevent fogging is to clean the window with shaving foam. I haven’t tried it on my car but it works on my bathroom mirror. Regarding fuel additives, adding a fuel injector cleaner periodically and using a gas line antifreeze just before cold winter temperatures can’t hurt, although typically not necessary if you use quality fuel and keep the fuel tak at least half full to prevent moisture.

Q. My 2008 Suzuki XL7, runs great but the RPM (idle speed) will dip or hesitate? Again, it runs great on the highway. I think it’s the timing belt or serpentine belt is off, what do you think?

A. A worn timing or serpentine won’t cause an engine to idle poorly. I suspect there is a fuel issue. This could be a clogged/dirty fuel injector, vacuum leak or even a sticking exhaust gas recirculation (EGR) valve.

Q. Let me first say that I enjoy the insight that comes from you on both your radio show and Newsday. My question is about thread sealant. When doing routine repairs on my vehicles (brakes, suspension etc.) is it advisable to use thread sealant as an additional measure of safety or is it ok to just tighten nuts and bolts according to manufacturer’s specification?

A. Topically use a thread locker (Loctite is one) when that bolt is under extreme stress or instructed to by the vehicle manufacturer. If the fasteners are something that is something that are removed periodically, I wouldn’t use thread locker, just tighten to manufactures specifications.

Got a car question, email the Car Doctor for a personal reply.

Fri, 25 Nov 2022 22:00:00 -0600 By John Paul, Senior Manager, Public Affairs and Traffic Safety, AAA Northeast en-US text/html
Killexams : 100+ Fascinating Questions That Don't Have Answers

It’s human nature to be curious, and people have an undying desire to answer every question that comes to mind.

With advances in technology and the connectivity of the internet, questions that might have gone unanswered for eternity have come to a conclusive resolution.

However, even with all of the information at our disposal, there are some questions that simply do not have answers.

RELATED: 100 Deep Questions To Get To Know Yourself Much Better

100+ Questions That Don’t Have Answers

There are many questions that have gone unanswered forever and will most likely continue to cause confusion in the minds of those who just need to know. And that list of unanswerable questions is huge.

Some of the questions that plague us are about the concept of time, science, or philosophy. Others are random, weird, or funny and are centered around curiosity, not a bonafide need.

Life’s Biggest Unanswerable Questions

Below is a list of thought-provoking questions that may leave you baffled, send you out in search of real answers, or make you double over in laughter.

1. If God made everything, who made God?

2. Do ghosts exist and, if so, how do we know?

3. How did life first start?

4. Is there anything that can travel faster than light?

5. How did we first determine there was a consciousness and a subconsciousness?

6. Do beings on other planets consider us aliens?

7. If everyone has their truth, how do we know what the real truth is?

8. Why are cars built to go faster than the speed limits?

9. What came first, the sun or the Earth?

10. How far east can you travel before you start traveling west?

Most Confusing Unanswerable Questions

This next set of questions can take you down an endless trail of confusion, thinking and rethinking your answers. In the end, you'll have to accept you simply don't know.

11. Was math invented by humans or simply discovered?

12. When you forget a thought, where does it go?

13. What makes you uniquely you?

14. If rules are meant to be broken, why make them in the first place?

15. What do people who have been deaf since birth hear when they think?

16. What do blind people see when they dream?

17. If you try to lose on purpose, but accidentally win, did you win or lose?

18. If you are expecting the unexpected, isn’t the unexpected now expected?

19. When your soul leaves your body, does it look like you?

20. If Adam and Eve were the first and only people, aren’t we all related?

21. If you enjoyed wasting time, were you really wasting time?

22. Who was the first teacher’s teacher?

23. When you wait for your waiter to come take your order, aren’t you now the “waiter”?

24. What exactly was the first person to milk a cow really trying to do?

25. What is the exact definition of perfect health?

26. Do animals have a subconscious?

27. Will reincarnation ever be possible, or does it already exist?

28. Do you really need a license for a self-driving vehicle?

29. Is it possible to know it all?

30. Can technology be used to control our emotions?

RELATED: 320 Would You Rather Questions For The Best Game Night Ever

Unanswerable Questions About the Concept of Time

Time is a big topic. Because we use it to decide when birthdays, holidays, and other special occasions occur, there tend to be many unanswered questions about the concept.

31. When did time first begin?

32. Is there a reason you are here at this point in your life?

33. Does time end at some point?

34. Will time travel ever be possible?

35. Why do we keep time?

36. Who decided age is based on rotations around the sun?

37. If the early bird gets the worm, why do they tell you that good things come to those who wait?

38. Who created the first calendar and how’d they know where to start?

39. How do we know the future is not actually the past and vice versa?

40. Will there come a time when people will live forever?

41. Will people still drive in 20 years?

42. Does time always move forward?

43. Are past, present, and future real?

44. Is time infinite or will it one day run out?

45. Does time really exist or is it a shared mental construct?

Scientific Unanswerable Questions

Science has resolved a lot of questions for humankind over time. Still, there are many curiosities for which there are still no answers.

46. Is the Earth alive?

47. Where does the universe begin and end?

48. If you drill a hole through the middle of the earth and leap through, are you falling or floating?

49. Were there people that existed before the universe?

50. If everyone on Earth leapt into the ocean at once, would we flood the world?

51. Do caterpillars know they will morph into butterflies or do they just like cocoons?

52. If we evolved from monkeys, why are there still monkeys running around?

53. Who decided February should have 28/29 days while all the rest had 30/31?

54. Will a journey to the center of the earth ever really be possible?

55. Will we ever find a cure for cancer?

56. How long before people can opt to clone themselves?

57. Is there life on other planets?

58. Will we one day be able to back our brains up on storage devices?

59. If a human being is genetically enhanced, are they still human?

Funny Unanswerable Questions

The questions in the section won't necessarily change our lives if answered, but will definitely garner a chuckle or two.

60. Why do people bake cookies but cook bacon?

61. At what age does old age begin?

62. How do you know your life isn’t just one crazy hallucination?

63. If you hit yourself and it hurts, are you weak or are you strong?

64. If something is described as “indescribable,” hasn’t it just been described?

65. How would you look up the word “dictionary” in the dictionary?

66. How far up do bald people go when washing their faces?

67. Why do people say “slept like a baby” when babies wake up throughout the night?

68. If a cyclops closes its eye, is it winking or blinking?

69. Are eyebrows facial hair?

70. Can you talk down to a person taller than you?

71. Are prisons equipped with emergency exits?

72. If you dive into the fountain of youth but can’t swim and drown, will you still live forever?

73. If Cinderella fit the lost slipper perfectly, how did she lose it in the first place?

74. If a word is misspelled in the dictionary, how do we find it?

RELATED: 7 Hard Questions You Must Ask Before You'll Have The Life You Want

Random Unanswerable Questions

Do you know someone who randomly asks questions that make you wonder how they got there? Well, there are some things they might have tossed around in their strange minds.

75. What are dreams made of?

76. How long will people remember you once you die?

77. Why set goals if everyone is eventually just going to die?

78. Are soulmates really a thing or do two people just like each other a lot?

79. Why do we have belly buttons for our entire lives?

80. What do they call French kissing in France?

81. What is the wealth and fame threshold for being “assassinated” and not “murdered”?

82. Do dentists go to other dentists?

83. If R-rated movies are for adults, why do children act in them?

84. Are braces removed when someone dies?

85. Since tomatoes are a fruit, should ketchup be considered a smoothie?

86. Does hating hateful people make you a hateful person?

87. If the number 2 pencil is most widely used, why is it not number 1?

88. If people forget about you after you die, did you really ever exist?

89. Do we all hear sounds the same?

Philosophical Unanswerable Questions

Many thinkers have attempted to provide responses to philosophical questions. But there are some that might forever plague us.

90. Are we actually free-willed or are our actions predetermined by destiny?

91. What happens after you die?

92. Is it really possible to be objective?

93. What is the purpose of human beings?

94. What is God?

94. What is the Devil?

96. Who decided what was right and what was wrong?

97. If killing is so wrong, what makes us kill people who kill other people?

98. Was there a time when nothing existed?

99. Is karma real or are we just making it up so people will be kind?

Weird Unanswerable Questions

Some questions can only be described as "weird." Sure, we might want to know, but is it really necessary?

100. Which came first, the fruit called “orange” or the color?

101. Are we really living or are we actually dying slowly?

102. At what point does it go from partly sunny to partly cloudy?

103. Why does glue not stick to the inside of the bottle?

104. In the word “scent” which letter is silent: the "s" or the "c"?

105. What is the color of a mirror?

106. If it loses its wings, is it still a “fly”?

107. Why does a “cold” make your body temperature hot with fever?

108. If you drop soap on the floor, is the floor now clean or is the soap now dirty?

109. How do we know when it’s “all said and done”?

110. What came first, the chicken or the egg?

RELATED: 7 Seriously Disturbing Thoughts Even 'Normal' People Have

NyRee Ausler is a writer from Seattle, Washington, and author of seven books. She covers lifestyle and entertainment and news, as well as navigating the workplace and social issues.

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Fri, 02 Dec 2022 10:00:00 -0600 en text/html
Killexams : Plastics and Human Rights: Questions and Answers

Plastic production, use, and disposal have significant impacts on human rights. Plastics contain toxic chemical additives, which can pose significant threats to human health. Because they are made of fossil fuels, plastics are driving the climate crisis, which in turn threatens human rights.

On November 28, 2022, countries around the world will begin to negotiate a new Global Plastics Treaty. The negotiations are based on a resolution by the United Nations Environment Assembly, mandating the creation of a legally binding instrument by the end of 2024 to end plastic pollution. The world is drowning in plastic, and the creation of this mandate recognizes the urgency of addressing the problem for the benefit of human beings and the environment. As negotiations proceed, the countries involved should ensure that the treaty addresses plastics in a way that protects human rights.

Each year, more than 300 million metric tons of plastic is created. Many plastic products are single use, cannot be recycled, and remain in the environment for decades or centuries. Only 9 percent of plastic ever produced has been recycled, while the remaining plastic waste is dumped, landfilled, incinerated, or litters the environment. Of all plastic produced, 79 percent has accumulated in landfills, informal dumpsites, or the natural environment, and 12 percent has been incinerated.  

This document examines the ways that plastic production, use, and disposal threaten human rights, and why governments should take immediate steps to limit plastics to meet their human rights obligations.

Why are plastics a human rights issue?

The production, use, and disposal of plastic generates harmful effects on human health and the environment. International human rights law obligates governments to address such harms and to respect, protect, and fulfill the rights to health, water, access to information, and a healthy environment.

The plastic life cycle begins with oil and gas extraction. Ninety-nine percent of plastics are made of fossil fuels, including oil and gas, and plastics and petrochemicals are estimated to drive 30 percent of the growth in oil demand by 2030 and nearly half of the growth in oil demand by 2050. Oil and gas production can emit toxic chemicals through drilling operations, mechanical equipment, storage tanks, and transportation of fuels. For example, benzene, a carcinogenic compound, is often emitted from petroleum operations into the water, soil, and air, which can threaten the health of nearby communities.

Plastic production and manufacturing turns fossil fuel raw materials and chemical additives into plastic that can be used to make packaging, consumer products, and other goods. The refining and manufacturing processes pose threats to human rights, particularly to communities living close to petrochemical production facilities and refineries, by emitting harmful pollutants into the air and water. Refineries and plastic production facilities are often located in low-income and marginalized communities and communities of color, which are disproportionately impacted by pollution and environmental harm.

Plastic products are then used by consumers and in industrial activities. Some studies have linked ingested plastic particles with impacts on cell function, chronic inflammation, and disruptions to the endocrine system. Currently, plastic producers around the world are not required to identify chemical additives in their products, so consumers are not able to access information about the chemical makeup of plastics and their potential impacts on their health.

After use, some plastic is recycled and returns to the plastic production stage. Most plastic is disposed of in formal landfill or informal dumpsites or is incinerated at an industrial facility or disposed of through open burning. When plastic is dumped or landfilled, it naturally breaks down into microplastics, polluting the soil, water, air, wildlife, and human bodies. Methods to dispose of plastic waste, including incineration, contribute to short-term and long-term health effects as harmful chemicals and particulate matter are released into the air.

Why are plastics an increasing problem?

Since the 1950s, plastic has evolved from being a less common, multiuse material to being ubiquitous in modern equipment, packaging, textiles, and other common goods. Global annual plastic production has soared from two million metric tons in 1950 to 380 million metric tons in 2015, a 190-fold increase.

Not only has plastic use increased over recent decades, but plastic production is also projected to triple from 2015 to 2060. Plans to scale up the plastic industry are largely driven by the world’s largest oil and gas producing companies, alongside consumer goods companies. As countries around the world begin to address their dependence on oil and gas as a source of energy, fossil fuel producing companies are increasing investments in plastic and petrochemical production, as well as increasing capacity to make plastic, as an alternative area of growth.

The same fossil fuel companies have led decades-long disinformation campaigns to advance the myth that plastic is recyclable, while internal industry documents as early as the 1970s show that plastic producers knew recycling wasn’t an acceptable solution.

How do plastics contribute to the climate crisis?

Plastics are a major contributor to climate change. The extraction, transport, and refining of oil and gas, their conversation into the raw materials for plastics, and the transportation and burning of plastic waste all emit significant quantities of greenhouse gases, which are contributing to the climate crisis. In 2019, global production, disposal, and incineration of plastic emitted 850 million metric tons of CO2e, or carbon dioxide equivalent, as much as would be emitted by 189 500-Megawatt coal power plants.

If plastic use continues to grow as projected, by 2050 the greenhouse gas emissions from plastic production and incineration will reach 15 percent of the global carbon budget, making global climate goals extremely difficult, if not impossible, to reach.

What makes plastics toxic?

Chemical additives are added to plastics during production to change or enhance performance, functionality, or other properties of the plastic production. While chemical additives provide plastic products qualities that make them useful, they can also be toxic environmental pollutants and harmful to human health. For example, phthalates, bisphenol A (BPA), and per- and polyfluoroalkyl substances (PFAS) are common chemical additives in plastic that are known to harm human health and are linked with cancer and harm to reproductive systems.

How do plastics affect at-risk groups and marginalized communities? 

Exposure to toxins in plastic products – and emitted during disposal – can have particular and unique impacts on children, women, and pregnant and older people due to biological factors. Women exposed to endocrine disrupting chemicals, including BPA, are at increased risk of polycystic ovarian syndrome and recurrent miscarriages. Exposure to these chemicals prior to and during childbearing years can result in increased likelihood of children being born with disabilities. Children, when exposed to the same levels of air pollution as adults, are at risk for more acute health impacts due to their rapid development. Children growing up in areas with high levels of industrial air pollution are likely to have reduced lung function. Exposure to chemicals may lead to harmful effects that do not appear until puberty or adulthood.

Older people are also particularly affected. As the human body ages, changes in organ functioning may make it harder for people’s bodies to process environmental pollutants, including toxins emitted during plastic recycling. A slower metabolism, coupled with earlier-life exposure, can lead to pollutants remaining in older people’s bodies for a longer period than for younger adults, increasing their exposure to toxins.

Isn’t recycling the solution to the plastics crisis?

No. While recycling is often portrayed as a positive, environmentally friendly practice, when plastic is recycled, it releases pollutants and toxins into local environments, threatening the health of those working in and living nearby recycling facilities.

Human Rights Watch documented that plastic recycling in Turkey – the largest recipient of plastic waste exports from the European Union – is harming people’s health. Pollutants and toxins emitted from recycling affect workers, including children, and people living near recycling facilities. Workers and residents of neighboring communities described respiratory problems, severe headaches, skin ailments, lack of protective equipment, and little to no access to medical treatment for occupational illnesses. Many of the facilities Human Rights Watch visited were located dangerously close to homes, in contravention of Turkish laws and environmental regulations.

Why is plastic waste being shipped around the world?

Countries in the Global North, including the United States, Canada, Japan, United Kingdom, and European Union member states, have routinely exported their plastic waste as “recycling” to countries with weak or nonexistent environmental regulations, low labor costs, and little government oversight on environmental and labor rights violations. They do so because they lack the physical infrastructure to recycle it domestically, and profits can be made by selling it to companies in other countries for processing. In this way, they externalize the health, environmental, and economic costs of their high consumption economies instead of reducing levels of consumption or investing in waste management.

For decades, China was the world's single largest importer of plastic waste, importing approximately 45 percent of global plastic waste from 1992 to 2016. Due to the high environmental impacts of plastic waste, the Chinese government created what it calls its National Sword Policy in January 2018, which banned the import of most plastic waste. So exporting countries have searched for new places to send their waste, and Malaysia, Indonesia, Vietnam, and Turkey have recently become key destinations for the world’s plastic waste exports.

What is the Global Plastics Treaty?

In March 2022, the United Nations Environment Assembly agreed to draft a multilateral environmental treaty addressing the global plastics crisis. The mandate paves the way for countries to establish a legally binding instrument to address the impacts of plastics throughout their lifecycle. 

What are some key steps governments can take to ensure the Global Plastics Treaty enhances respect for human rights?

Governments in the UN Environmental Assembly should negotiate and adopt a plastics treaty that protects and respects human rights. A comprehensive and rights-respecting Global Plastics Treaty requires the meaningful participation of civil society. Such participation should include representation from people most at risk from the harm of plastic production, use, and disposal, including Indigenous people, people with disabilities, older people, children and young people, women, waste pickers and workers in the informal economy, labor unions, minorities, and people living in poverty.

Some key elements of a global plastics treaty that would protect human rights are requirements to:

  1. Take steps to decrease the production and consumption of plastic.
  2. End the production of unnecessary virgin plastic.
  3. Increase transparency about chemical additives in plastics and limit the addition of harmful chemical additives in plastic products.
  4. Protect the rights to health, water, food, and a healthy environment of at-risk populations and marginalized communities affected by plastic pollution.
Tue, 22 Nov 2022 21:02:00 -0600 en text/html
Killexams : CBSE Class 10 Chemistry Chapter 2 Important mock test for 2023

CBSE Class 10 Chemistry Chapter 2 Important Questions and Answers: In this article, we are going to discuss the Important questions of CBSE Class 10 Chemistry Chapter 2 Acids, Bases and Salts. It is the second chapter in Unit I Chemical Substances - Nature and Behaviour.

The article covers important Multiple choice questions, Assertion Reason Questions along with their direction, Case study questions, Very short answer questions, Short Answer Questions and Long Answer questions.

These mock test have been specially curated by subject experts. Students should refer to these questions along with the CBSE Class 10 Science sample Paper 2022-23 issued by the board. 

Unit I: Chemical Substances - Nature and Behaviour

Chapter 2 Acids, Bases & Salts


1.The colour of phenolphthalein in acidic medium is-

(a) Yellow

(b) Pink

(c) Colourless


2. Generally, when certain metals react with an acid they release gas.

(a) Nitrogen 

(b) Oxygen

(c) Hydrogen 

d) Argon

3.Milkiness of lime water disappear when excess CO2 is passed due to the formation of-

(a) Calcium hydroxide

(b)Calcium chloride

(c) Calcium bicarbonate

(d)Calcium carbonate

4. What is formed when zinc reacts with sodium hydroxide?

(a) Zinc hydroxide and sodium

(b) Sodium zincate and hydrogen gas

(c) Sodium zinc-oxide and hydrogen gas

(d) Sodium zincate and water

5.The common name for the substance used as antacid-

(a) Washing soda

(b) Plaster of Paris

(c) Bleaching powder

(d) Baking soda

6. Rain is called acid rain when it's:

(a) pH falls below 7 

(b) pH falls below 6

(c) pH falls below 5.6 

(d) pH is above 7

7.When you clean a metal vessel with tamarind the reaction taking place is:

Metaloxide+X-------- Salt+Water. What is X here?




(d)Carbon dioxide

8. Sodium hydroxide turns phenolphthalein solution

(a) pink

(b) yellow

(c) colourless

(d) orange

9.Sodium carbonate is a basic salt because it is a salt of a

(a) strong acid and strong base

(b) weak acid and weak base

(c) strong acid and weak base

(d) weak acid and strong base 

  1. Which one of the given is true, if a substance has a pH value of 7?

(a) The substance is a base

(b) The substance is an acid

(c) The substance is a neutral substance

(d) Either (A) or (B)


DIRECTION: Each of these questions contains an Assertion followed by Reason. Read them carefully

and answer the question on the basis of following options. You have to select the one

that best describes the two statements.

(a) Both A and R are true and R is the correct explanation of A.

(b) Both A and R are true and R is not the correct explanation of A.

(c) A is true but R is false.

(d)A is false but R is true.

  1. Assertion (A) : The acid must be added to water with constant stirring.

Reason(R) : Mixing of an acid with water decreases the concentration of H+ ions per unit volume.

  1. Assertion (A): On heating, colour of hydrated copper sulphate changes from blue to white.

Reason (R) :On strong heating , Copper sulphate crystals lose all the water of crystallisation and form anhydrous salt.

  1. Assertion(A): The aqueous solution of glucose and alcohol do not show acidic character.

Reason(R ): Aqueous solution of glucose and alcohol do not provide H+ ions .

  1. Assertion (A): HCl gas does not change the colour of dry blue litmus paper.

Reason (R): HCl gas dissolves in the water present in wet litmus paper to form H+ ions

  1. Assertion(A): Weak acids have low electrical conductivity.

Reason(R ): Strong acids and weak acids have equal concentration of H+ ions in their solutions.


1 A copper vessel gets tarnished due to formation of an oxide layer on its surface. On rubbing lemon on the vessel, the surface is cleaned, and the vessel begins to shine again. This is due to the fact that it reacts with the acid present in lemon to form a salt which is washed away with water. As a result, the layer of copper oxide is removed from the surface of the vessel and the shining surface is exposed.

1.Which of the following acids is present in lemon?

(a) Formic acid (b) Acetic acid (c) Citric acid (d) Hydrochloric acid

2.The nature of copper oxide is

a) acidic b) basic c) neutral d) amphoteric

3.Name the salt formed in the above reaction

a) copper carbonate b) copper chloride

c)copper citrate d) copper citrate

4.The phenomenon of copper getting tarnished is

a) corrosion b) rancidity c) displacement d)none of these

2 Taj Mahal, the seventh wonder of the world, is made of white stone. This white stone contains the same substance ‘A’ that is present in chalk powder and lime-stone. It is turning yellow due to polluted air. If it is cleaned by an acidic cleaner, a gas ‘B’ is released, which when passed through a solution ‘C’, forms the same substance which is present in the white stone that was used to make Taj mahal.

CBSE Class 10 Chemistry Chapter 2 Important Questions and Answers

2.1. The substance A is-

A.) Ca3CO2 

B.) CaCO3 

C.) Ca(OH)2

D.) CaSO4

2.2. Gas B is-

A..) Hydrogen 

B.) Nitrogen 

C.) Chlorine

D.) Carbon dioxide

2.3. Solution C is-

A.) CaCl2 

B.) B. CaCO3 

C.) Ca(OH)2

D.) CaSO4

2.4.What is the nature of the substance A?

A.) Acidic 

B.) Basic 

C.) Neutral

D.) None

2.5.The polluted air around Taj mahal leads to the following problem because of which it is getting Marble cancer:

A.) Global Warming

B.) Acid Rain 

 C.) GreenHouse Effect

D.) All are correct

  1. Salt of a strong acid and strong base is neutral with a pH value of 7. NaCl common salt is formed by a combination of hydrochloric acid and sodium hydroxide solution. This is the salt that is used in food. Some salt is called rock salt which was formed when seas of bygone ages dried up. The common salt thus obtained is an important raw material for various materials of daily use, such as sodium hydroxide, baking soda, washing soda, and bleaching powder.

1 Which of the following does not form an acidic salt?

a) Phosphoric acid 

b) Carbonic acid

c)Hydrochloric acid 

d) Sulphuric acid

2 Which of the following salts has no water of crystallization?

a) Copper sulphate 

b) Washing soda

c)Baking soda 

d) Gypsum

3. The formula of baking soda is

a) NaCl 

b) KHCO3 

c) NaHCO3 

d) Na2CO3

4. Which of the following is treated with chlorine to obtain bleaching powder

a) Ca SO4 

b) Ca (OH)2 

c) Mg (OH)2 

d) KOH




  1. Name an olfactory indicator?
  2. The pH of an aqueous solution decreases from 3 to 2. What will happen to the nature of the solution ?
  3. A cloth strip dipped in onion juice is used for testing a liquid ‘X. The liquid ‘X changes its odour. Which type of an indicator is onion juice?
  4. Which bases are called alkalies? provide an example.
  5. A milkman adds a very small amount of baking soda to fresh milk. Why?
  6. Name the hardest substance in the body.
  7. Acidic and basic solutions in water conduct electricity. Why?


  1. With the help of an example explain what happens when a base reacts with a non- metallic oxide. What do you infer about the nature of non-metal Oxide?
  2. An old man complained of acute pain in stomach. Doctor gave him a small antacid tablet and he got immediate relief. What actually happened?
  3. A gas X reacts with lime water and forms a compound Y which is used as a bleaching agent in the chemical industry. Identify X and Y. provide the chemical equation of the reaction involved.
  4. A doctor applied surgical bandages on the fractured bones of a patient after making it wet. What changes are likely to occur?
  5. A sample of bleaching powder was kept in an airtight container. After a month, it lost some of its chlorine content. How will you account for it?
  6. Salt A commonly used in bakery products on heating gets converted into another salt B which itself is used for removal of hardness of water and a gas C is evolved. The gas C when passed through lime water, turns it milky. Identify A, B and C.
  7. When electricity is passed through a common salt solution, sodium hydroxide is produced along with the liberation of two gases ‘X’ and T. The gas ‘X’ burns with a pop sound whereas T is used for disinfecting drinking water.

(i) Identify X and Y.

(ii) provide the chemical equation for the reaction stated above.

(iii) State the reaction of Y with dry slaked lime.

  1. Mohan and Priyanka were playing in the garden. Priyanka was stung by a bee and started crying and returned home. Her mother immediately observed the affected area and applied a thin coating of toothpaste as first aid, then took her to the nearest doctor.

(i) Why did Priyanka cry?

(ii) Name the chemical substance present in bee sting.

(iii) How is toothpaste effective in such an incident?

  1. Fresh milk has pH of 6. When it changes to curd, will its pH value increase or decrease? Why?
  2. The oxide of a metal M was water soluble. When a blue litmus trip was dipped in this solution, it did not undergo any change in colour .Predict the nature of the oxide.


1 (a) Name the raw materials used in the manufacture of Sodium carbonate in Solvay process?

(b) How is sodium bi carbonate formed during the Solvay process separated from a mixture of NH4Cl and NaHCO3?

(c)How is sodium carbonate obtained from Sodium bi Carbonate?

2 (a) Why does an aqueous solution of an acid conduct electricity?

(b) How does the concentration of hydrogen ion changes the solution of an acid is diluted with water?

(c ) Which has a higher pH value ; a concentrated or dilute HCl?

(d) What would you observe on adding dilute HCl to

(i) Sodium bicarbonate placed in a test tube.

(ii) Zinc metal in a test tube.



1 C

2 C

3 C

4 B

5 D 

6 C

7 A

8 A

9 D

10 C


1 B

2 A

3 A

4 C

5 C



i) C

ii) B

iii) D

iv) A


i) B

ii) D

iii) C

iv) B

v) B


i) B

ii) C

iii) C

iv) B


Q.1. Name an olfactory indicator?

Ans- Onion

Q.2. The pH of an aqueous solution decreases from 3 to 2. What will happen to the nature of the solution ?

Ans- The acidic character of the solution will further increases.

Q.3. A cloth strip dipped in onion juice is used for testing a liquid ‘X. The liquid ‘X changes its odour. Which type of an indicator is onion juice?

Ans - Olfactory indicator

Q.4. Which bases are called alkalies? provide an example.

Ans - Water soluble bases are called alkalies. e.g.- NaOH

Q.5. A milk man adds a very small amount of baking soda to fresh milk. Why?

Ans- It is done to prevent the formation of lactic acid which spoils the milk.

Q.6. Name the hardest substance in the body.

Ans- Tooth enamel (Calcium phosphate).

Q.7. Acidic and basic solutions in water conduct electricity. Why?

Ans- Because they produce hydrogen and hydroxide ions respectively.


1 With the help of an example, explain what happens when a base reacts with a non- metallic oxide. What do you infer about the nature of non-metal oxide?

Ans: Oxides of non-metals react with bases to form salt and water. For example, the reaction between carbon dioxide and calcium hydroxide. Calcium hydroxide, which is a base, reacts with carbon dioxide to produce salt and water. Hence, oxides of non-metals are acidic in nature.

CBSE Class 10 Chemistry Chapter 2 Important Questions and Answers

2 An old man complained of acute pain in stomach. Doctor gave him a small antacid tablet and he got immediate relief. What actually happened?

Ans: The old man was suffering from acute acidity. Antacid tablet contains NaHCO3. It reacts with the acid HCl formed because of acidity and neutralizes its effect.

3. A gas X reacts with lime water and forms a compound Y which is used as a bleaching agent in the chemical industry. Identify X and Y. provide the chemical equation of the reaction involved.

Ans: X is chlorine Y is CaOCl2 (calcium oxychloride) used as bleaching agent. 

Ca (OH) 2+ Cl2 --------------CaOCl2 +H2O

4. A doctor applied surgical bandages on the fractured bones of a patient after making it wet. What changes are likely to occur?

Ans: Surgical bandages are made from plaster of Paris. When applied on the fractured bones after making them wet , it changes into a hard mass called Gypsum.

CaSO4.1/2 H2O + 3/2 H2O------- CaSO4.2H2O

  1. A sample of bleaching powder was kept in an airtight container. After a month, it lost some of its chlorine content. How will you account for it?

Ans: Bleaching powder if kept even in an air tight container will slowly decompose of its own and form calcium chlorate and calcium chloride. The reaction is called auto oxidation. This will result in decrease in its Chlorine contents.

6CaOCl2 -----Ca(ClO3)2 + 5CaCl2

  1. Salt A commonly used in bakery products on heating gets converted into another salt B which itself is used for removal of hardness of water and a gas C is evolved. The gas C when passed through lime water, turns it milky. Identify A, B and C.

Ans: Baking soda is a salt used in bakery products. It gives sodium carbonate and carbon dioxide gas on heating. Sodium carbonate is used to remove the hardness of water. Carbon dioxide turns lime water milky. Therefore,

CBSE Class 10 Chemistry Chapter 2 Important Questions and Answers

  • Salt A is sodium bicarbonate
  • Salt B is sodium carbonate, which is used to remove hardness of water.
  • The C is carbon dioxide gas which turns lime water milky.
  1. When electricity is passed through a common salt solution, sodium hydroxide is produced along with the liberation of two gases ‘X’ and T. The gas ‘X’ burns with a pop sound whereas T is used for disinfecting drinking water.

(i) Identify X and Y.

(ii) provide the chemical equation for the reaction stated above.

(iii) State the reaction of Y with dry slaked lime.


(i) The gas X’ is H2 and gas ‘Y’ is Cl2.

(ii) The chemical equation for the reaction is:

CBSE Class 10 Chemistry Chapter 2 Important Questions and Answers

(iii) Cl2 reacts with slaked lime to form bleaching powder. 

Ca (OH)2 + Cl2 → CaOCl2 + H2O

  1. Mohan and Priyanka were playing in the garden. Priyanka was stung by a bee and started crying and returned home. Her mother immediately observed the affected area and applied a thin coating of toothpaste as first aid, then took her to the nearest doctor.

(i) Why did Priyanka cry?

(ii) Name the chemical substance present in bee sting.

(iii) How is toothpaste effective in such an incident?

  1. Fresh milk has a pH of 6. When it changes to curd, will its pH value increase or decrease? Why?

Ans- When fresh milk changes to curd, the pH of the solution is likely to decrease. Actually, lactose present in milk gets converted to lactic acid when curd is formed from milk. Therefore, the medium becomes more acidic and its pH decreases.

  1. The oxide of a metal M was water soluble. When a blue litmus trip was dipped in this solution, it did not undergo any change in colour .Predict the nature of the oxide.

Ans- The metal oxide (MO) is of basic in nature. It dissolves in water to from metal hydroxide as follow.

MO + H2O-----M(OH)2

A blue litmus does not undergo any change in color in the basic medium.


1 (a) Name the raw materials used in the manufacture of Sodium carbonate in Solvay process?

(b) How is sodium bi carbonate formed during the Solvay process separated from a mixture of NH4Cl and NaHCO3?

(c)How is sodium carbonate obtained from Sodium bi Carbonate?

Ans- (a) The raw materials used are: NaCl, Lime stone or CaCO3 and NH3

(b) NaHCO3 is sparingly soluble or less soluble in water and gets separated as a precipitate while NH4Cl remains in solution. The filtrate is removed by filtration.

(c ) NaHCO3 is converted to sodium carbonate upon heating.

2NaHCO3 ---- Na2CO3 + H2O + CO2

2 (a) Why does an aqueous solution of an acid conduct electricity?

(b) How does the concentration of hydrogen ion changes the solution of an acid is diluted with water?

(c ) Which has a higher pH value ; a concentrated or dilute HCl?

(d) What would you observe on adding dilute HCl to

(i) Sodium bicarbonate placed in a test tube.

(ii) Zinc metal in a test tube.

Ans- (a) An aqueous solution of an acid conducts electricity because in water an acid dissociates to provide ions. Since current is carried by the movements of ions, a.q. solution of acid conduct electricity.

(b) Upon dilution, more of acid dissociates into ions Therefore concentration of hydrogen ion increases.

(c ) Although more H+ ions are formed upon dilution , but the number of ions per unit volume  decrease. Therefore, pH will increase upon dilution.

(d) (i) CO2 gas would evolve accompanied by brisk effervescences.

NaHCO3 +HCl ------NaCl + CO2 + H2O

(ii) Hydrogen gas would evolve accompanied by brisk effervescences.

Zn + 2HCl --- ZnCl2 + H2

The Central Board of Secondary Education has not yet announced a date for the release of their date sheet for CBSE Class 10 board examination 2023. However, the board exams are likely to commence in February, 2023.

Students should ensure that they do not miss covering and revising these important questions from the chapter Acids, Base and Salts. 

The candidates appearing for CBSE Class 10 board examinations still have about three months.  Therefore, the students must begin preparing for their examinations. 

Use CBSE Class 10 Science Syllabus 2022-23 to know what all courses need to be covered. 

If starting now, students would be able to pass their exams with flying colours. 

All the best!


CBSE Class 10 Chemistry Chapter 1 Important mock test for 2023

CBSE Class 10 Chemistry Chapter 3 Important mock test for 2023

CBSE Class 10 Chemistry Chapter 4 Important mock test for 2023

Tue, 29 Nov 2022 02:35:00 -0600 text/html
Killexams : CaixaBank robot answers the most customer questions

CaixaBank’s artificial intelligence (AI)-based virtual assistant has answered more questions for more customers than any other support channel, after four million people used the service.

The Spanish bank said the CaixaBankNow virtual assistant receives an average of 50,000 questions a day, either spoken or written, to help access services such as making payments or blocking lost cash cards.

A CaixaBank statement said: “The online assistant offers immediate answers on a wide range of topics, such as the features of banking products and services, how to take out a product or stepping customers through the process of restoring their digital banking password. It also lets customers make an appointment at their branch, check their balance and activity, and carry out simple operations, such as blocking cards or sending money through the Spanish mobile payment solution Bizum.”

The main queries addressed to the virtual assistant were customers asking about bills, deposits, accessing the Bizum mobile payments system, and making appointments with in-branch advisers.

The AI assistant also supports the bank’s staff in offering answers to questions and is an example of how digital transformation at banks goes beyond transforming customer engagements with chatbots or replacing repetitive manual tasks with robotic process automation software.

The CaixaBankNow AI is also capable of answering questions from CaixaBank’s employees, such as those involving internal rules and technology, and can answer more than 1,500 questions in different languages.

The bank added: “Now CaixaBank is applying all the power of AI to develop tools for its managers and customers, and for other strategic objectives, such as employee training.”

In 2020, the bank introduced AI as part of its internal training platform to help its staff understand what training they could benefit from and help them to access it.

Courses in languages, executive skills, digital skills, finance and risk management, among others, are offered through the service.

Mon, 14 Nov 2022 23:34:00 -0600 en text/html
Killexams : The 6 Questions 'Andor' Season 2 Must Answer

Andor took 'Star Wars' fans back to the beginning of Cassian Andor's (Diego Luna) journey with the rebellion against the Empire.

Set five years before the events of 2016 film Rogue One: A Star Wars Story, there is still some way to go before Cassian becomes the rebel captain that fans know and love.

The Disney+ show has reached the end of its first season, and with a second season already confirmed there are many issues that the drama needs to address in its forthcoming episodes.

From left, Forest Whittaker as Saw Gerrera, Genevieve O'Reilly as Mon Mothma, Diego Luna as Cassian Andor and Stellan Skarsgard as Luthen Rael in "Andor," which will be returning to Disney+ for a second season. Lucasfilm Ltd. & TM.

Season 2 of Andor will be formatted in a slightly different way to Season 1, as it will be split into three-episode blocks, with each episode representing one year in Cassian's life until the events of Rogue One.

With that in mind, there are a lot of things that need to be addressed in Season 2 in order to fully complete Cassian's story, so let's break them down.

1. What Will Happen to Cassian?

The Andor Season 1 finale ended with Cassian sneaking onto Luthen Rael's (Stellan Skarsgård) ship, and offering him the chance to kill him as Luthen had originally planned to do.

Claiming he was not playing a game, Cassian gives Luthen an ultimatum: he can kill him or take him into custody. To this, Luthen smiles but his decision is not revealed before the credits start to roll.

Now, given there's a second season it is safe to assume that Luthen does not take Cassian up on his offer to kill him, and what is most likely to happen is that Cassian will become a part of the rebellion for real.

But how this comes to pass will certainly be an important subject for the show to tackle in Season 2.

2. How Will Mon Mothma's Plans Go?

All season long, Mon Mothma (Genevieve O'Reilly) has been trying to find a way to address her money problems. With the Empire tightening its grip on the galaxy, Mon is no longer able to secretly funnel her family fortune into the rebellion.

One way that she chooses to tackle this is by making an alliance with Davo Sculdun (Richard Dillane), an oligarch that Mon describes as a "brute" but she soon realizes may be her only way to hide her rebellious cause.

Davo suggests that they unite their houses by having her daughter marry his son, and the finale sees the two factions meet for the nuptials.

If the marriage did go ahead, one thing Season 2 will need to address is whether Mon's plans will come to fruition. As she's the leader of the rebellion in Rogue One it will be interesting to see exactly how this happens.

3. What Will Happen with Saw Gerrera and Luthen Rael?

Saw Gerrara (Forest Whittaker) is one of the main leaders of the rebellion, and he plays an important part in Rogue One as well as several other 'Star Wars' projects.

Whittaker reprised his role for a few scenes opposite Skarsgård, where it becomes clear that the cause is split into factions that are as yet unable to work together.

Luthen tells Saw of a plot from the Empire to target one of the other rebel leaders, which causes tension between the two and kickstarts Saw's paranoia against the other rebel leaders as seen in Rogue One.

It will be interesting to see how their dynamic continues and what the repercussions might be, particularly given Luthen is not in Rogue One but Saw is.

4. Will Dedra Meero and Syril Karn Team Up?

Denise Gough as Dedra Meero in "Andor." Lucasfilm Ltd. & TM.

Dedra Meero (Denise Gough) and Syril Karn (Kyle Soller) are two sides of the same coin of the Empire, and both have one goal throughout Season 1: Catch Cassian Andor.

Syril wants to catch Cassian to fix his reputation, while Dedra wants to stop any hint of insurrection against the Empire. Though their goal was the same the pair were still at odds with one another in Season 1, but this seems like it might change in Season 2 given the finale.

In the last episode, the residents of Ferrix finally stand up against the Empire at Maarva's (Fiona Shaw) funeral, and during the attack Dedra gets caught in the crossfire. It is only thanks to Syril that she is able to survive the uprising and in the pair's closing moments together it seems as if they could finally see eye-to-eye.

A team up between the two members of the Empire seems like a reasonable thing to happen in Season 2, but how they do will be the question.

5. How Does Cassian Meet K-2SO?

Alan Tudyk's straight-talking yet witty robot K-2SO was one of the fan favorites of Rogue One, and in the film it is explained that Cassian reprogrammed the droid during one of his missions.

Originally, Tudyk was meant to return to the franchise in Season 1 of Andor but this changed and it was confirmed before the show premiered that the character would be back in Season 2 instead.

Andor will have to explain exactly how the two characters came to meet, and what happened to make Cassian reprogram the droid for the rebellion. But this is more than likely to be explored in the show's second season.

6. Will We See Any Other 'Rogue One' Characters?

On that note, the question remains whether the show will also mark the return of any of the other main Rogue One characters.

From the main team that made it their mission to steal the Death Star plans there was also Jyn Erso (Felicity Jones), Bodhi Rook (Riz Ahmed), Chirrut Imwe (Donnie Yen) and Baze Malbus (Jiang Wen).

Given Saw's presence in Andor there is a possibility that Jyn could make a cameo appearance, the character was with Saw until the age of 16 at which point he abandoned her and she lived a life of crime in order to survive. There are any number of ways that Jones could return as Jyn, so hopefully it'll come to pass.

Also, during this period Bodhi would be working with Jyn's father Galen Erso (Mads Mikkelsen) as an Imperial cargo pilot.

The Season 1 finale featured a post-credit scene that showed the Death Star being built, the weapon was designed by Galen so there is a chance that either him or Bodhi could make an appearance in Season 2.

Andor Season 1 is available to watch in full on Disney+ now.

The cast of "Andor" season 1, which is out in full on Disney+ now.
Tue, 22 Nov 2022 21:57:00 -0600 en text/html
Killexams : Wednesday: 8 Questions Season 2 Needs to Answer

Well… that’s not quite good enough for us, in fact, it’s more than a little frustrating. Here’s what we need to understand and what we hope to get answers to if the show gets renewed. 

Did Wednesday Actually Murder Laurel Gates/Ms. Thornhill? 

We knew Wednesday was going to be pretty dark before we even watched an episode, but are we seriously expected to believe Wednesday actually curb-stomped a woman to death, even if she was out to get her? 

Laurel Gates was the epitome of the kind of world Wednesday thought she lived in. Spending time earning her trust as the seemingly unassuming Ms. Thornhill (Christina Ricci), Wednesday had (against her better judgement) learned to appreciate the support she was receiving. But then having a gun pointed at you by someone who literally resurrected the dead in order to wipe you out will change a few things. 

Killing Laurel Gates has kind of been breezed over. Sure it was self-defense, but it was still taking the active decision to end someone else’s life. So is there a chance that Laurel isn’t actually dead, rather severely maimed? And will she come back to exact even more revenge on Wednesday in the future? 

Who’s Stalking Wednesday? 

In between the ancestral background checks, the mystery of the week, the overarching murder mystery and figuring out how to make friends, Wednesday also had to deal with a stalker. 

Someone has been taking photographs of her throughout the first season, and by the end of the finale, their physical prints were brought into the 21st century. Wednesday was gifted a phone, and immediately started receiving these weird snaps. While most would freak out about it, Wednesday just sees it as a new case to solve, and is kind of thrilled at someone paying her this kind of unauthorised attention. But there is literally no clue as to who this person could be. 

Sat, 26 Nov 2022 16:55:00 -0600 en-US text/html
Killexams : Holiday Trivia: 30 mock test For Your Next Party Game

Marta Pérez; Styling: Vero Designs

Ah, Christmastime: the most wonderful time of year. The season for cozy sweaters, holiday parties, and tree decorating, is also the season for gathering to reminisce, reconnect, and make new memories. Whether planning a holiday soiree with friends or adding festive ideas to an annual family tradition, a game of fun-filled trivia is sure to brighten up any holiday celebration. We’ve got you covered with Christmas and holiday trivia mock test guaranteed to make your event sparkle.

Why trivia for the holidays? Stephen Walsh, owner of the independent trivia company Walsh Trivia in Baltimore, Maryland, says December is by far his busiest time of year, hosting both public and private holiday-themed trivia competitions for companies, families and friends. His in-person and virtual holiday events routinely attract hundreds of participants, and Walsh believes trivia is a unique niche that people of all ages can experience together.

“Trivia is unique because it's something everyone can have fun with,” he says. “It’s low-pressure, keeps players engaged and the questions are often catalysts for great conversations. Participants are learning something new about their teammates as they play. Trivia adds laughter and light to the holiday season while also remaining accessible for everyone.”

Below, Walsh shares top Christmas and holiday-themed trivia mock test that will enliven any gathering. Read on for knowledge that will dazzle the room this season! 

In what decade did the first Christmas stamp appear in the U.S.?

Mandy Busby Creative

Answer: The sixties. Following years of requests for a holiday stamp, the U.S. Postal Service issued its first Christmas stamp in Pennsylvania in November 1962. The department printed its largest number ever for a specialty stamp—350 million—and quickly sold out. The supply was replenished, and by the end of the year, 1 billion stamps had been printed. The rest is history! The tradition continues today with new holiday stamps unveiled each year.

How much does the average American currently spend on gifts and holiday items?

Alison Gootee; Styling: Elizabeth Demos

Answer: More than you think! Nearly $1,000, according to the latest data from the National Retail Federation. Roughly one week’s median salary, the amount consistently goes up each year, with an estimated 96 percent of Americans buying gifts for their families. And the most popular present of all? Gift cards.

What iconic holiday character first appeared in a 1939 booklet published by the department store Montgomery Ward?

Answer: Believe it or not, we have a marketing campaign to thank for the most famous reindeer of all: Rudolph. The original eight reindeer were popularized by Clement Clarke Moore's 1823 poem A Visit from St. Nicholas, but Rudolph didn’t come along until 1939, when he was dreamed up in Chicago by Montgomery Ward advertising copywriter Robert Lewis May. The copyright was later transferred to May and became a book, and the famed version of the song Rudolph the Red-Nosed Reindeer (by Gene Autry) hit No. 1 in 1949.

Many cultures have a tradition of hanging this food-shaped ornament on the Christmas tree. What is the item and meaning behind it?

picture alliance / Getty Images

Answer: The Christmas pickle, or the Weihnachtsgurke! It's a German tradition that's popular in the Midwest (and the South) today. Read all about it here.

Both gingerbread houses and candy canes were almost certainly introduced to the U.S. by immigrants from what country?

Sheri Giblin; Food Styling: Margaret Dickey; Prop Styling: Amy Stone

Answer: Germany. Some historians have gingerbread houses dating all the way back to ancient Rome, but both sweets have become synonymous with the holidays in the U.S. thanks to the millions of German immigrants who arrived in the 19th and early 20th century. Gingerbread houses had been especially popular in Germany since the publication of the Brothers Grimm's Hansel and Gretel in 1812, and candy canes are thought to have originated in in the U.S. in 1847 when August Imgard, a German-Swedish immigrant, decorated a tree with paper ornaments and candy canes.

Which U.S. President was the first to recognize Hanukkah with a menorah lighting at the White House?

Answer: Jimmy Carter in 1979. Since then, every U.S. president has celebrated Hanukkah in some way. The first official White House Hanukkah Party took place in 2001, hosted by George W. Bush. An annual reception hosted by the President and First Lady, the guest list includes hundreds of American Jewish leaders and school and yeshiva deans.

What holiday shopping day saw total sales increase by 362 percent from 2015 to 2019?

Hector Manuel Sanchez

Answer: Cyber Monday. While Black Friday (the day after Thanksgiving) is still the busiest shopping day of the year, Cyber Monday (the Monday following Thanksgiving) is the fastest growing day. Sales grew from $2.98 billion in 2015 to a historic high of $10.8 billion in 2020.

Can you name three towns in the South with holiday-inspired names?

Photo: Ralph Anderson

Answer: Believe it or not, Christmas, Florida is a real town. As is Santa Claus, Georgia, and Mistletoe, Kentucky. Here's our list of 18 Southern towns with festive names.

What famous author gave us the line that Christmas “doesn’t come from a store. Maybe Christmas…perhaps…means a little bit more!”?

Answer: Dr. Seuss, also known as Theodor “Ted” Geisel, in his holiday classic How the Grinch Stole Christmas. After the debut of Seuss’ 1957 children’s book, his lead character of the Grinch has appeared in numerous films and television specials and is featured in two of the three highest-grossing Christmas films of all time at the U.S. box office.

The holiday decoration tinsel was originally made from strands of what metal?

Photo: Hector Manuel Sanchez; Styling: Lindsey Ellis Beatty

Answer: Silver. Once a display of wealth, it was tradition in Germany to hang tinsel ("estincele,” or sparkle in Old French, or “lametta,” meaning tiny blade in Italian) made of thin strips of silver on a Christmas tree to reflect candlelight. But since silver has a hefty price tag, cheaper alternatives have been made since the early 20th century. 

Where did the tradition of celebrating Christmas in July start?

Answer: In Brevard, North Carolina on July 24th and 25th in 1933 at a girls' camp called Keystone Camp. Real all about how Christmas in July came to be in North Carolina here.

Our present-day version of Santa Claus is based on folklore traditions surrounding Saint Nicholas, a real-life Christian bishop in what modern day country?

inhauscreative/Getty Images

Answer: Turkey. Active in the fourth century, St. Nicholas’ existence was not officially recorded, so nothing certain is known of his life except that he was probably bishop of Myra in the 4th century. His reputation for generosity became legendary, as well as stories of miracles he performed. St. Nicholas’ lore persisted in Holland as Sinterklaas (a Dutch variant of the name St. Nicholas), which gave rise to our current version of a gift-giving “Saint Nick” or Santa Claus.

Which American pop singer spent her early years growing up on a Christmas tree farm run by her parents?

Laurey W. Glenn

Answer: Taylor Swift, who loved growing up on the 11-acre farm in Reading, Pennsylvania, so much that she wrote a song about it (“Christmas Tree Farm," written and released in 2019).

Which iconic Christmas song was released on a No. 1 Christmas album in 1994—but didn’t reach No. 1 on the Billboard Hot 100 singles chart until 25 years later?

Answer: “All I Want for Christmas Is You” by Mariah Carey. Her 1994 album “Merry Christmas” ranked No. 3 on the album charts and sold 15 million copies worldwide, but the album’s lead single didn’t hit No. 1 until 2019. While the original continues to dominate the airwaves each December, Carey also recorded a new version as a duet with Justin Bieber for his 2011 album Under the Mistletoe.

The combined might of Bing Crosby, Fred Astaire and Irving Berlin helped make this song from the 1942 musical film Holiday Inn the biggest Christmas song ever. What was the song?

John Swope / Getty Images

Answer: "White Christmas"—written by Berlin, the song won an Academy Award and the version sung by Bing Crosby became the world's best-selling single of all time, with estimated sales topping 50 million copies worldwide. When other versions of the song are added to Crosby's, sales of the song exceed 100 million.

How many pieces of holiday mail and packages will the U.S. Postal Service deliver each day this year between Thanksgiving and New Year’s Day?

Laurey W. Glenn

Answer: 60 million. Thanks to new package processing equipment and operational improvements, the Postal Service is expected to process nearly 60 million packages every day this holiday season, up from 53 million in 2021. Last year, the USPS projected that more than 12 billion holiday letters, cards and packages would be delivered between Thanksgiving and New Year's Day.

The 1944 MGM movie musical Meet Me in St. Louis introduced a Judy Garland holiday megahit that was later covered by dozens of artists, including Garth Brooks, James Taylor, Christina Aguilera, Josh Groban and John Legend. What song was it?

Answer: "Have Yourself a Merry Little Christmas"—originally dreamed up by songwriters Hugh Martin and Ralph Blaine, the song has continued to live on through the years—both as its original Judy Garland recording for the film and its many covers. Other popular recordings of the song include versions by Frank Sinatra, Tori Amos, Michael Bublé, and Sam Smith.

Which of the four presidents on Mt. Rushmore is rumored to have had his own recipe for eggnog?

Monica Farber / Southern Living

Answer: George Washington. This urban legend has flourished for decades. The first president allegedly had his own recipe for the popular holiday drink. There’s just one problem: it likely isn’t true, as there is no documented evidence of eggnog consumption at Mount Vernon. It’s unclear how the myth began, but we do know that Washington was fond of a brandy-based drink known as a cherry bounce. 

What country has a tradition of eating KFC on Christmas day?

Southern Living

Answer: Japan! Aptly nicknamed "Kentucky Fried Christmas," what began as a cheeky gimmick in the mid-1980s has evolved into a more widespread justification for locals to bring home a festive feast of KFC to share with family the week of Christmas. A “party barrel” bucket filled with fried chicken, coleslaw and cake makes for an annual holiday treat that many Japanese families enjoy, year after year.

In the song "The Twelve Days of Christmas," what is given on the seventh day?

Answer: Seven swans-a-swimming! An English Christmas carol that embodies the spirit of the holidays, the classic tune describes gifts that increase on each of the 12 days of the Christmas season. The song’s lyrics were first published in England in the late eighteenth century, with its most popular melody derived from a 1909 arrangement of a traditional folk melody by English composer Frederic Austin. Variations of the song also exist in Scotland, the Faroe Islands, Sweden and France.

Kwanzaa was first celebrated in the U.S. in what decade?

Victor Protasio; Food Styling: Emily Nabors Hall; Prop Styling: Audrey Davis

Answer: The 1960s. Dr. Maulana Karenga created Kwanzaa in 1966 as a way of uniting the African American community. Modeled after traditional African harvest celebrations, the weeklong holiday is celebrated as a cultural holiday; many people celebrate it in addition to other religious traditions. As many as 12 million Americans celebrate Kwanzaa annually, including writer Jessica B. Harris, who shares the meaning and principles of Kwanzaa here.

Name the animatronic cassette-playing bear toy that every kid wanted for Christmas in the mid-1980s?

Answer: Teddy Ruxpin. Alongside Cabbage Patch Dolls, Pez dispensers and California Raisins figurines, the ‘80s brought us the toy that parents searched high and low for at Christmastime. The best-selling toy of 1985 and 1986, the talking bear was novel in its ability “tell stories” while the cassette tape played. If you’ve still got one, you’re in luck: a Teddy Ruxpin in mint condition can fetch upwards of $1,000 today.

Was "Jingle Bells" always a Christmas song?

Alison Gootee; Styling: Elizabeth Demos

Answer: No! One of the most well-known holiday tunes in the world, "Jingle Bells" was published by James Lord Pierpont in 1857 as “The One Horse Open Sleigh” with no particular connection to Christmas. The song developed a Christmas and winter connection as it grew it popularity starting in the 1860’s. In 1965, "Jingle Bells" became the first song broadcast from space when the astronauts aboard Gemini 6 performed the song on a harmonica and jingle bells as a prank.

In the holiday favorite A Christmas Story, what is the name of the neighbors whose dogs ate the Christmas turkey?

Answer: The Bumpuses. In Bob Clark's classic 1983 comedy film, the house next to Ralphie Parker’s is home to the Bumpuses and their 785 smelly hound dogs. The dogs hilariously get to the Parkers’ Turkey dinner before they can stop them.

The beloved ballet The Nutcracker was first performed in what city in 1892?

Answer: St. Petersburg, Russia. With its iconic score by Pyotr Tchaikovsky, the ballet The Nutcracker features a unique instrument that Tchaikovsky had recently discovered in France: the celesta, which provides the unforgettable sounds we now associate with the Sugar Plum Fairy. The Nutcracker is now one of the most popular annual ballets to be performed across the U.S. each holiday season. Editor Tip: It also makes the perfect mother-daughter holiday tradition!

Who starred at George Bailey in the holiday classic It’s a Wonderful Life?

Answer: James “Jimmy” Stewart. A 1946 Christmas film, the movie was the first Stewart appeared in after returning from military service following World War II. Considered one of the greatest films in history, it was nominated for five Academy Awards and remains a beloved American family holiday tradition. There’s even a pilgrimage to make: The Seneca Falls It’s a Wonderful Life Museum in Seneca Falls, NY, features a year-round museum and a It’s a Wonderful Life-themed town festival each December.

What is the name of potato pancake that is traditionally prepared to celebrate Hanukkah?

Antonis Achilleos; Food Styling: Emily Nabors Hall; Prop Styling: Lydia Pursell

Answer: Latke! Is there anything more delicious? Traditionally made with potatoes (but sometimes other vegetables!) and a staple for Hanukkah, every family has their own recipe for latkes and no two are the same. With origins in Italian pancakes made with ricotta cheese, potato latkes gained popularity in Eastern Europe in the 1800s and have been a hit ever since. 

In the holiday classic Home Alone, where are the McAllisters going on vacation when they leave Kevin behind?

Answer: Paris. The 1990 American Christmas film Home Alone stars Macaulay Culkin as Kevin McAllister, a boy who gets accidentally left at home while his family heads to Paris for vacation. Hilarious hijinks ensue when burglars break in. Home Alone is currently the second highest-grossing Christmas film of all time at $476.7 million, surpassed only by 2018’s The Grinch, which brought in $512.9 million. 

In the song Frosty The Snowman, what makes Frosty come to life?

Classic Media/CBS

Answer: An old silk hat. An international holiday sensation written by Steve Nelson and Jack Rollins in 1950, Frosty The Snowman tells of a snowman who comes to life—but only after a magical silk hat is placed upon his head. Numerous book and film adaptations followed, including the popular Christmas special narrated by Jimmy Durante (in his final film role) that has aired every year since its debut in 1969. 

In Charles Dickens’ “A Christmas Carol,” what is Scrooge’s first name?

Answer: Ebenezer. First published as a novella in 1843, the book commonly known as A Christmas Carol tells the story of an elderly grouch who is transformed into a kinder man following visits from the ghost of his former business partner Jacob Marley and several impactful spirits. An instant success, the holiday staple has never been out of print and has been adapted many times for film, stage and opera. 

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Read the original article on Southern Living.

Wed, 16 Nov 2022 05:19:00 -0600 en-US text/html Killexams : mock test from the ‘Car Doctor’

Q. First time reaching out. I have a 2013 Honda Civic. Lately, I have been hearing a weird sound from the rear of the car. Almost sounds as if something is banging around in the trunk, but my trunk is empty. Thought it was a loose pipe of some sort, but after checking quickly under the car, I didn’t see anything obvious hanging. Could it be the gas tank at all?

A. Great idea to look in the truck I have seen loose spare tires, jacks, lug wrenches, soda and soup cans. At this point the car needs to go on a lift and look for loose or worn suspension bushings and worn strut mounts. The issue could also be a loose baffle in the muffler. It shouldn’t take more than 30 minutes to find the source of the noise and to rule out if it is a safety issue.

Q. I own a 2022 Subaru Forester when I turn off the car there is a noise that starts. I recorded a video and had the Subaru dealer look at it and they tell that is nothing, they didn’t find anything with my car. Is it nothing?

A. Great idea to record the noise. More than likely the noise is the heat shield that surrounds the exhaust system expanding and contracting as it cools. In the past I have seen manufacturers add shims to fill the gap and quiet the noise. Where the car is new I would provide the dealer a little time to see if Subaru has come up with a fix to quiet the noise.

Q. My question is how long does diesel fuel stay fresh in a car? Can I add Stabil to diesel or is that for gas engines only?

A. I have seen untreated diesel fuel last six months or more. Over time untreated diesel fuel will become sludgy and can even grow an algae like substance. Stabil does have a product specifically for diesel engines and if are storing a diesel-powered vehicle for anytime it would be best to use a fuel additive.

Q. I have a 2018 Nissan Murano SL with approximately 38,000 miles. I have bled and flushed brakes in the past before but decided to try using a pressure bleeder. I read in the service manual to either disconnect the ABS (anti-lock brakes) control unit or negative battery cable when bleeding brakes. I’d like to not disconnect battery, so I attempted to disconnect the ABS module, which is near impossible to reach without removing parts. Is it absolutely necessary that the ABS module be disconnected, will there be any adverse effects? In the past on older vehicles I never had an issue but I’m unsure how to proceed with these newer vehicles.

A. Nissan is very specific to disconnect the battery of the module to prevent any damage to the anti-lock brake system. ABS brake systems will sometimes need to use a scan tool to cycle the ABS system to remove any air. Changing brake fluid is a great idea every three to four years, but as a bit of a cheat, siphon out some (no all) of the fluid from the master cylinder. If you do this at each oil change you will “freshen” up the brake fluid.

Q. I have a 2022 Infiniti QX 60. Bought brand new with 3000 miles. With my vehicle running, pulling into a parking space that is on an incline, foot on the brake pedal, and then placed into park. With the foot still on the brake pedal, turn off the motor. The vehicle will roll back approximately 2 to 3 inches after you remove your foot from the brake pedal. The dealership has said they’ve tested other new vehicles on the lot and that they all do this. This is a scary situation as someone may be exiting from the other doors, you still have your foot on the brake, they open the door and can be in a tight situation where the car will roll backwards, as you let your foot off the brake pedal. Or you could open the door yourself and an object could be next to the side of your driver’s door. I Got my driver’s license in 1965, and never had any other vehicle that did this or it was in one that did this. Having worked on cars and knowing what 1-8-4-3-6-5-7-2 stands for, helps when you’re talking to the mechanics in the shop. I still have my 1970 AMX race car. The standard answer is they all do it which I don’t agree with. Appreciate any help that you can provide me.

A. The 2022 Infiniti QX has the new nine-speed automatic transmission that replaced the less than desirable CVT transmission. I agree that three inches of roll back is too much, and I would personally want to test another vehicle for comparison. Infiniti is a little cheeky about this. In the owner’s manual it states that you should always apply the parking brake when stopped and the “park” position is not a substitute for the parking brake. At this point I haven’t been able to locate any technical bulletins about this issue. If in fact “they all do it” it may be an undesirable characteristic of this transmission. By the way in my opinion the AMC AMX is one of the most underappreciated muscle cars of its time. Readers if you are wondering, 1-8-4-3-6-5-7-2 is the firing order for a small block Chevy engine.

Got a car question, email the Car Doctor for a personal reply.

Fri, 02 Dec 2022 21:01:00 -0600 By John Paul, Senior Manager, Public Affairs and Traffic Safety, AAA Northeast en-US text/html
Killexams : CBSE Class 10 Maths Chapter 2 Important mock test for 2023

CBSE Class 10 Maths Chapter 2 Important mock test for 2023: Important MCQs, Objective type questions, short answer questions and long answer questions questions that can asked from CBSE Class 10 Maths Chapter 2 Polynomials.

CBSE Class 10 Maths Chapter 2 Important mock test for 2023: According to the latest course structure of Class 10 Mathematics by CBSE board, Unit 2 Algebra has a total weightage of 20 marks. In this article we are going to cover the various kinds of MCQs, Objective type questions, short answer questions and long answer questions questions that can asked from CBSE Class 10 Maths Chapter 2 Polynomials. These important questions have been prepared by subject experts. Using these questions along with the sample Paper for practice, students would be able to score very well. 

Polynomials is the first chapter of the second unit. The other chapters in Unit 2 of CBSE Class 10 Maths are Linear Equations in Two Variables, Quadratic Equations and Arithmetic Progressions.

The chapter covers Zeros of a polynomial. Relationship between zeros and coefficients of quadratic polynomials.

CBSE Class 10 Maths Chapter 2 Important mock test for 2023


 CBSE Class 10 Maths Chapter 2 Important  mock  test for 2023



Q1. Write the zeros of the polynomial x2 − x − 6

Q2. Write a polynomial whose zeros are (2+√3) and (2 − √3)

Q3. If α, β are the zeros of the polynomial, such that α+β=6 and α β=4, then write the


Q4. If α and 1/α are the zeros of the polynomial 4x2 − 2x + (k − 4) , find the value of k .

Q5. Check whether -2 is a zero of the polynomial 9x3 − 18x2 − x − 2


Q1. Find the zeroes of the polynomial 2x2 − 9 and verify the relationship between zeros and coeffients.

Q2. Find a quadratic polynomial the sum and product of whose zeros are 3 and -2/5


Q3. If α and β are zeros of 3x2 + 5x + 13 ,then find the value of 1/α + 1/β

Q4. Check whether x = −3 is a zero of x3 + 11x2 + 23x − 35.

Q5. Find p and q if p and q are the zeros of the quadratic polynomial x2+ px + q.






To check your preparation level for the upcoming class 10th board exam, attempt the practise papers for CBSE class 10 below:

These practise papers have been prepared by subject experts, especially incorporating the modifications and updates in the latest syllabus by CBSE.



1CBSE Class 10 Maths Chapter 2 Important  mock  test for 2023


CBSE Class 10 Maths Chapter 2 Important  mock  test for 2023


CBSE Class 10 Maths Chapter 2 Important  mock  test for 2023


CBSE Class 10 Maths Chapter 2 Important  mock  test for 2023


CBSE Class 10 Maths Chapter 2 Important  mock  test for 2023


CBSE Class 10 Maths Chapter 2 Important  mock  test for 2023


Q1. X2 − x − 6 = (x − 3)(x + 2) so the zeros are 3 and −2

Q2. = K(x2 − (α + β)x + αβ)

= K(x2 − (2 + √3 + 2 − √3)x + (2 + √3)(2 − √3))

=K (x2 − (4)x + 22− (√3)2)

= K(x2 − 4x + (4 − 3))

= K(x2 − 4x + 1)

Q3. P(x) = K (x2 − (α + β)x + αβ) = K(x2 − 6x + 4)


CBSE Class 10 Maths Chapter 2 Important  mock  test for 2023


CBSE Class 10 Maths Chapter 2 Important  mock  test for 2023



Q1. ± 3/√2

Q2. x2 − 15x − 2

Q3. − 5/13

Q4. x= -3 is not a zero

Q5. 5 p = 1; q = −2



1 i) y = 14/21, − 1/7

ii) x = −√3 , −7/√3

iii) x = − 2/√3,  3/ 4√3∕2

2 Product = -2

3 Correct proof

4 The quadratic polynomial cannot have equal zeros for any odd integer k > 1

5 k = − 1/9



CBSE Class 10 Maths Chapter 2 Important  mock  test for 2023


CBSE Class 10 Maths Chapter 2 Important  mock  test for 2023


CBSE Class 10 Maths Chapter 2 Important  mock  test for 2023


CBSE Class 10 Maths Chapter 2 Important  mock  test for 2023


CBSE Class 10 Maths Chapter 2 Important  mock  test for 2023


All the best!

Thu, 17 Nov 2022 20:47:00 -0600 text/html
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