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Physics Past Questions and Answers

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Physics Questions

Question 386:

The mode of heat transfer which does not require a material medium is

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A Conduction
B Radiation
C Convection
D Propagation

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Question 387:

The expansion of solids can be considered a disadvantage in the

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A Balance wheel of a watch
B Fitting of wheels on rims
C Fire alarm
D Thermostat

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Question 388:

The specific latent heat of fusion of lead is the amount of heat required to

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A Melt lead at its melting point
B Heat a unit mass of lead through 1<sup style='font-size: smaller;'>o</sup>C
C Change the state of a unit mass of lead at its melting point
D Change the state of a unit mass of lead at its boiling point

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Question 389:

Which of the following is common to evaporation and boiling? They

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A Take place at any temperature
B Are surface phenomena
C Involve change of state
D Take place at a definite pressure

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Question 390:

Mercury is suitable as a barometric fluid because it

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A Expands uniformly
B Is opaque
C Is several times denser than water
D Is a good conductor of heat

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