Heat and Thermodynamics MCQ question and answer with solution

71

Consider the following statements.
1. Steam at 100°C and boiling water at 100°C contain same amount of heat.
2. Latent heat of fusion of ice is equal to the latent heat of vaporization of water.
3. In an air conditioner, heat is extracted from the room air at the evaporator coils and is ejected out at the condensor coils.
Which of these statements is/are correct?

A) Only 1 and 2 B) Only 2 and 3 C) Only 2 D) Only 3

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Answer & Solution

Answer: Option D

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72

Centigrade which is the mother's unit of temperature is named on which of the following-

A) Calvin B) Jean Pierre Christian C) Marten stromer D) Andres Celsius

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Answer & Solution

Answer: Option D

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73

Assertion (A) A piece of ice added to drink, cools it.
Reason (R) Ice takes latent heat from the drink for melting resulting the cooling of the drink.
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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74

A gas thermometer is more sensitive than a liquid thermometer because a gas

A) is lighter than liquid B) expands more than a liquid C) is easy to obtain D) does not change state easily

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Answer & Solution

Answer: Option D

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75

Which of the following is the more thermal insulation in the group?

A) Rubber, Glass, Plastic, Cotton, Copper B) Plastic, Ebonite, Paper, Cotton, Bakelite, Dry air, Rubber C) Silver, Copper, Gold, Iron D) Bakelite, Dry air, Paper ebonite, Aluminium

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Answer & Solution

Answer: Option B

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76

Borosilicate glass ware is used in microwave ovens because-

A) It is not brittle B) It is highly heat resistant C) It cooks faster than any other vessel D) It is energy efficient

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Answer & Solution

Answer: Option B

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77

In a pressure cooker food is cooked in shorter time because

A) the boiling point of water increases B) the boiling point of water decreases C) the food takes less heat D) None of the above

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Answer & Solution

Answer: Option A

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78

The density of the liquid when heated

A) decreases B) increases C) does not change D) may increases on decreases depending on pressure

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Answer & Solution

Answer: Option A

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79

The absolute zero is a temperature at which . . . . . . . .

A) molecular motion in a gas would cease B) water freezes C) all gases become liquid D) all gases become solid

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Answer & Solution

Answer: Option D

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80

Assertion (A): Woollen clothes keeps us warm.
Reason (R): Woollen fibres are made from a special type of protein, which is a bad conductor of heat.
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 C

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