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

Calculate the energy required to vapourise 50 g of water initially at 80° C. [specific heat capacity of water = 4-2 Jg^-1K^-1 ] [specific latent heat of vapourisation of water = 2260 Jg^-1] 

A. 113,000 J      B. 117,200 J      C. 234,400 J      D. 420.000 J

The working principle of a pressure cooker is based on the ______

A. increase in the volume of steam inside it
B. complete trapping of heat inside it
C. increase in the pressure of the pot
D. decrease in the pressure of the pot.

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.

A faulty thermometer registers 102.5^oC at 100^oC. If the thermometer has no zero error, what will it register at 55.0^oC ?

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