Physics - Questions and Answers, General Study (GK)

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481.

A hollow sphere of radius R A cube of side R and thin circular plate of radius R made up of the same material, are all heated to 20 degree Celsius above room temperature, When left to cool in the room, which of them will reach the room temperature first?

(a)Circular plate

(b)Cube

(c)Sphere

(d)All of them will reach the room temperature at the same time

Comment

Answer is: C

482.

Relation between the colour and temperature of a star is given by

(a)Wien's displacement law

(b)Hubble's law

(c)Planck's law

(d)Hippacrus low

Comment

Answer is: A

483.

The temperature of gas is measured with a

(a)Gas thermometer

(b)Platinum resistance thermometer

(c)Vapour pressure thermometer

(d)Pyrometer

Comment

Answer is: D

484.

Cooking taken longest time

(a)At Shimla

(b)At Mount Everest

(c)At the sea level

(d)None of these

Comment

Answer is: B

485.

A large Iceberg melts at the base but not at the top because

(a)Ice at the top is different kind

(b)Higher pressure at the base lowers the melting point of ice

(c)Ice at the base contain impurities

(d)The base of icebergs remains in the warmer condition

Comment

Answer is: B

486.

Which of the following is the correct device for detection of thermal radiation?

(a)Liquid in glass thermometer

(b)Constant volume Gas thermometer

(c)Thermophile

(d)None of these

Comment

Answer is: C

487.

A gas is enclosed in a container which is then placed on a fast moving train. The temperature of gas

(a)Falls

(b)Rises

(c)Remain unchanged

(d)Becomes unsteady

Comment

Answer is: C

488.

A cooking pot should have

(a)High specific heat and high conductivity

(b)High specific heat and low conductivity

(c)Low specific heat and high conductivity

(d)Low specific heat and low conductivity

Comment

Answer is: C

489.

The temperature at which the vapour pressure of a liquid becomes equal to the external pressure is its

(a)Inversion point

(b)Melting point

(c)Boiling point

(d)None of these

Comment

Answer is: C

490.

The freezer in a refrigerator is located at the top of section so that

(a)The motor is not heated

(b)The heat gained from the environment is high

(c)The heat gained from the environment is low

(d)The entire Chamber of the refrigerator is cooled quickly due to convection

Comment

Answer is: D

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Physics - Questions and AnswersPage 49

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