Heat and Thermodynamics MCQ question and answer with solution

51

If the door of a refrigerator is kept open, than which of the following is true?

A) Room is cooled B) Room is heated C) Room is either cooled or heated D) Room is neither cooled nor heated

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Answer & Solution

Answer: Option B

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52

The normal temperature of human body on the Kelvin scale is

A) 280 B) 290 C) 300 D) 310

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Answer & Solution

Answer: Option D

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53

°F = . . . . . . . . . °C

A) 15 B) 25 C) 35 D) 45

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Answer & Solution

Answer: Option C

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54

Assertion (A): Black hole is such a celestial existence which cannot be seen by telescope.
Reason (R): The gravitational field of black hole is much strong that even light does not escape from it.

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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55

Refers to absolute zero temperature-

A) 273°C less than 0 B) 295°C less than 0 C) 300°C less than 0 D) 255°C less than 0

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Answer & Solution

Answer: Option A

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56

Assertion (A): Large cold storage plants use ammonia as refrigerant while domestic refrigerators use chlorofluorocarbons.
Reason (R): Ammonia can be liquefied at ambient temperatures at low pressures.

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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57

When hot liquid is poured into a thick glass tumbler, it cracks because glass

A) is a bad conductor of heat so only under surface expands B) has high temperature coefficient of expansion C) has a very low specific heat D) has low temperature coefficient of expansion

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Answer & Solution

Answer: Option A

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58

Maximum temperature inside pressure cooker depends on

A) Area of hole on the top and weight kept on it B) Area of hole on the top and food being cooked C) Weight kept on hole at top and food being cooked D) Area of hole on the top only

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Answer & Solution

Answer: Option A

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59

Why is it difficult to measure the coefficient of expansion of a liquid than solid?

A) Liquids tend to evaporate at all temperatures B) Liquids conduct more heat C) Liquids expand too much when heated D) Their containers also expand when heated

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Answer & Solution

Answer: Option D

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60

When ice melts, then

A) Volume increases B) Volume decreases C) Mass increases D) Mass decreases

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Answer & Solution

Answer: Option B

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