Heat and Thermodynamics MCQ question and answer with solution

71

Running a fan in the summer season is given relief because-

A) Our sweat evaporates rapidly from the fan air B) When the wind blows from the fan, more heat comes out of our body C) Fan provides cool air D) The fan increases the conductivity of the air

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Answer & Solution

Answer: Option A

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72

Heat from the Sun reaches Earth by the process of

A) conduction B) convection C) radiation D) All of these

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Answer & Solution

Answer: Option C

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73

A perfect black body is one whose emissive power is

A) maximum B) zero C) unity D) minimum

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Answer & Solution

Answer: Option C

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74

When a bottle is filled with water and it is freezing the bottle breaks down, because

A) Water expands upon freezing B) Bottle shrinks at freezing point C) The temperature outside the bottle is higher than inside D) Water expands on heating

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Answer & Solution

Answer: Option A

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75

Consider the figures of a metal ball and a metal ring given below.
The metal ball can just pass through the hole of a metal ring formed out of a strip. When the ball is heated it gets stuck. But when the metal is heated
Heat and Thermodynamics mcq question image

Heat and Thermodynamics mcq question image

A) The ball can still pass through the ring as diameter expands on heating B) The ball gets stuck because of the diameter of the hole decrease on expansion C) The ball will still pass through because the hole diameter does not change D) The ball will pass through because there is no change in the ring

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Answer & Solution

Answer: Option A

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76

The boiling point of water decreases at higher altitudes is due to

A) low temperature B) low atmospheric pressure C) high temperature D) high atmospheric pressure

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Answer & Solution

Answer: Option B

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77

Radiations coming from the sun are mostly in the form of

A) light only B) light and long wavelength infrared C) light and short wavelength infrared D) Both short and long wavelength infrared

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Answer & Solution

Answer: Option B

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78

The temperature of a place on one sunny day is 113 in Fahrenheit scale. The Kelvin scale reading of this temperature will be

A) 318 K B) 45 K C) 62.8 K D) 335.8 K

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Answer & Solution

Answer: Option A

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79

Water pipes in hilly areas often burst on a cold frosty night because

A) the material of which pipes are made contract due to cold and so breaks B) water in the pipes freezes and on freezing water expands, so pipes break C) frost makes the pipes rusty, so they break D) None of the above

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Answer & Solution

Answer: Option B

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80

Transfer of heat by convection can take place in

A) solids and liquids B) solids and vacuum C) gases and liquids D) vacuum and gases

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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