Heat and Thermodynamics MCQ question and answer with solution

81

Pressure cooker cooks food in lesser time because

A) The temperature of boiling water decreases due to high pressure B) Air has no effect as it is closed from all sides C) Temperature of boiling water increases due to high pressure D) Evaporation of the water used is very small

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Answer & Solution

Answer: Option C

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82

. . . . . . . . is not related to gases.

A) Boyle's law B) Joule's law C) Avogadro's law D) Charles's law

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Answer & Solution

Answer: Option B

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83

Under which condition real gas can work as an ideal gas?

A) High pressure and low temperature B) Low pressure and high temperature C) High pressure and high temperature D) Low pressure and low temperature

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Answer & Solution

Answer: Option B

Solution:

Real gases behave like ideal gases when the intermolecular forces become negligible.

At low pressure, gas molecules are far apart, reducing intermolecular attractions.

At high temperature, molecules move rapidly, so the effect of intermolecular forces becomes very small.

Therefore, under low pressure and high temperature, a real gas shows ideal gas behavior.

84

According to Newton's Law of Cooling the rate of cooling of a body is proportional to the

A) temperature of the body B) temperature of the surrounding C) fourth power of the temperature of the body D) difference of the temperature of the body and the surrounding

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Answer & Solution

Answer: Option D

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85

When a glass rod is placed in steam, its length increases but its width

A) Remains unchanged B) Decreases C) Increases D) Becomes irregular

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Answer & Solution

Answer: Option C

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86

The normal temperature of a human body is . . . . . . . .

A) 98.6°C B) 98.6°F C) 37°F D) 40°C

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Answer & Solution

Answer: Option B

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87

Assertion (A): A piece of ice added to the drink, cools it.
Reason (R): Ice takes latent heat from the drink for melting resulting in 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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88

Below is a statement (A) and a reason (R)-
(A): Left a small gap between tracks
(R): Iron spread in summer.

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

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Answer & Solution

Answer: Option C

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89

The amount of radiation emitted by a perfectly black body proportional to

A) temperature on ideal gas scale B) fourth root of temperature C) fourth power of temperature D) square root of temperature on ideal gas scale

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Answer & Solution

Answer: Option C

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90

Fruit stored in a cold chamber exhibit longer storage life because

A) Exposure to Sunlight is prevented B) Concentration of carbon dioxide in enviroment is increases C) Rate of respiration is decreased D) There is increase in humidity

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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