Physics Past Questions and Answers

Which of the following statements correctly defines the boiling point of a liquid? The temperature at which the

A Saturated vapour pressure equals the atmospheric pressure
B Molecules leaves the liquid at a rate equal to the rate at which they return
C Molecules leave the liquid at a rate higher than that at which they return
D Molecules leave the liquid at a rate lower than the rate at which they return

Question 3917:

The diagram given is used to determine the

A Boiling point of water
B Atmospheric pressure
C Upper fixed point of a thermometer
D Amount of water in the atmosphere

Question 3918:

An aluminium rod of length 1.8m at 10°C is heated to proceed produce a difference in length of 0.007m. Calculate the temperature to which it is heated. (Linear expansivity of aluminium = 2.3 x 10\(^{-5}\)K\(^{-1}\)

A 155oC
B 160oC
C 169oC
D 179oC

Question 3919:

A mercury-in-glass thermometer read 4cm at ice point and 29cm at steam point. Calculate the temperature when the mercury level is at 9cm

A 13oC
B 20oC
C 33oC
D 38oC

Question 3920:

The continuous stirring in the method of mixtures to determine the specific thermal capacity of a substance ensures

A Continuous dissipation of heat to the room
B Uniform distribution of thermal energy to all parts of the mixture
C That the thermal energy is confined to the mixture
D That there is rapid heat exchange