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

The silver coating on the inside of a vacuum flask reduces heat loss by ______

A. conduction.      B. radiation      C. condensation.      D. convection

Water falls through a height of 50m. Determine the temperature rise of the water at the bottom of the fall. [Neglect energy losses]. Specific heat capacity of water = 4200jkg^-1k^-1, g = 10ms^-2    

A. 0.119°C     B. 0.840°C    C. 1.190°C    D. 8.400°C

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.

When compared with water, mercury is preferred as a thermometric liquid because it ________

A. has a higher density
B. has a lower specific heat capacity
C. exhibits anomalous thermal expansion
D. contains molecules which have very strong adhesive forces

The design of the thermostat of an electric Iron is based on the _______

A. emission of electrons from metals when heated
B. Increase in size of metals when heated
C. Increase in the density of metals when heated
D. change in the mass of metals when heated.