Physics Practice Test – Heat Energy and Measurement of Temperature (Questions with Answers and Explanations)

It takes a shorter time for a liquid to boil at the top of a mountain than at the base because at the top, the ______

A. temperature is higher      B. pressure is lower     C. humidity is higher       D. temperature a constant.

The energy required to change a solid to liquid at constant temperature is called _____

A. thermal capacity     B. specific heat capacity     C. latent heat of fusion     D. latent heat of vapourisation

The amount of energy required to change a kilogram of ice block into water without a change in temperature is ______

A. heat capacity of ice
B. specific heat capacity
C. specific latent heat of vaporization of ice
D. specific latent heat of fusion of ice

An electric drill rated 400 W is used to drill a hole in copper of mass 400 g in 20 s. Calculate the rise in temperature if all the heat produced is absorbed by the copper. [Specific heat capacity of copper = 400 Jkg^-1K^-1 ].

A. 100°C     B. 8.75°C      C. 50°C     D. 45°C

The sagging of overhead electrical cables is the consequence of _____

A. linear expansivity      B. superficial expansivity      C. cubic expansivity      D. conductivity