Heat and Thermodynamics MCQ question and answer with solution

11

A fan produces feeling of comfort during hot weather, because

A) fan supplies cold air B) our perspiration evaporates rapidly C) one body radiates more heat D) conductivity of air increase

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Answer & Solution

Answer: Option B

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12

A thermometer is used to measure

A) heat B) thermal inductance C) fire D) temperature

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Answer & Solution

Answer: Option D

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13

Water is used in hot water bags because it

A) is easily obtained B) is cheaper and is not harmful C) has high specific heat D) is easy to heat water

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Answer: Option C

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14

A metal plate with a circular hole at the centre is heated. What will happen to the area of the hole?

A) Increase B) Decrease C) Remain constant D) Will increase first and then decrease

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Answer & Solution

Answer: Option A

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15

To convert temperature from Celsius to Kelvin scale, you must:

A) Add 273 to the given temperature B) Divide the given temperature by 273 C) Subtract 273 from the given temperature D) Multiply the given temperature by 273

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Answer & Solution

Answer: Option A

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16

Decrease in which of the following factors leads to an increase in the rate of evaporation?

A) Ambient temperature B) Humidity C) Area of the free surface of the liquid concerned D) Wind speed above the surface of the liquid

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Answer & Solution

Answer: Option B

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17

Water boils at a lower temperature on the hills because

A) it is cold on the hills B) there is less carbon dioxide on the hills C) there is a decrease in air pressure on the hills D) there is less oxygen

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Answer & Solution

Answer: Option C

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18

Which of the following is the example of ideal black body?

A) Kajal B) Blackboard C) A pin hole in a box D) None of the above

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Answer: Option C

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19

Let the average temperatures in Centigrade (C) and Fahrenheit (F) be $$\overline C $$ and $$\overline F $$. If $$\overline C $$ and $$\overline F $$ are related to $$F = \frac{9}{2}C + 32,$$ then $$\overline F $$ and $$\overline C $$ have the relation

A) $$\overline F = \frac{9}{2}\overline C + 32$$ B) $$\overline F = \overline C + 32$$ C) $$\overline F = \frac{9}{2}\overline C $$ D) $$\overline F = \frac{9}{5}\overline C - 32$$

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Answer & Solution

Answer: Option A

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20

On a cold day when the room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C, because

A) metals have higher thermal capacity than plastics B) plastics than a lower density than metals C) metals are good conductors of heat D) plastics have a higher thermal conductivity than metals

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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