Heat and Thermodynamics MCQ question and answer with solution

81

The cloudy nights are warmer than clear nights because

A) The clouds prevent radiation of heat from the ground and the air B) Clouds absorb Sunlight during the day and radiate the same in night C) Clouds make the atmosphere damp and generate heat D) The clouds obstruct the movement of air which creates heat

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Answer & Solution

Answer: Option A

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82

Woollen clothes keep the body warm because

A) wool increases the temperature of the body B) wool is a bad conductor C) wool absorbs radiant heat from outer object D) wool rejects heat from the outer objects

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Answer & Solution

Answer: Option B

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83

The cooling by a desert Cooler is based on

A) hot air replacement B) air dehydration C) evaporative Cooling D) air rehydration

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Answer & Solution

Answer: Option C

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84

What is the function of the thermostat of a refrigerator?

A) To lower the temperature B) To increase the freezing point C) To maintain constant temperature D) To decrease the melting point

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Answer & Solution

Answer: Option C

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85

A circular plate, a cube and a sphere all made up of same material and having the same mass, are heated to 300°C and left in a room. Which of them will have the slowest rate of cooling?

A) Circular plate B) Cube C) Sphere D) All will cool at the same rate

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Answer & Solution

Answer: Option C

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86

Which of the following is a good conductor of heat but bad conductor of electricity?

A) Mica B) Asbestos C) Celluloid D) Paraffin wax

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Answer & Solution

Answer: Option A

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87

The difference in temperature between two bodies is 30° C. What is the difference in degree Fahrenheit?

A) 64°F B) 54°F C) 86°F D) 72°F

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Answer & Solution

Answer: Option B

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88

Consider the following statements.
Assertion (A): Space based solar power (SBSP), it is suggested be made a national goal.
Reason (R): Supply of SBSP is 99% uninterrupted throughout the year, besides the enormity of energy availability.
Select the correct answer:

A) Both (A) and (R) are true and (R) is the correct explanation of (A) B) Both (A) and (R) are true, but (R) is not the correct explanation of (A) C) (A) is true, but (R) is false D) (A) is false, but (R) is true

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Answer & Solution

Answer: Option A

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89

When a piece of ice floating in a glass of water melts, the level of water will

A) Fall B) Rise C) Remain same D) Fall or rise depends on the temperature of water

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Answer & Solution

Answer: Option C

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90

We feel cool when we sit near the fan, this is because

A) fan gives cool air B) fan cools surrounding air C) air vapourises the sweat on our body D) we feel cool when air touches the body

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Answer & Solution

Answer: Option C

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Heat and Thermodynamics MCQ question and answer with solution | Physics Gk MCQs