Thermal Physics Quiz

Two different objects are in thermal contact with one another. The objects are at different temperatures. The temperatures of the two objects determine

• the process by which thermal energy is transferred.

• the heat capacity of each object.

• the direction of transfer of thermal energy between the objects.

• the amount of internal energy in each object.

The kelvin temperature of an object is a measure of

• the total energy of the molecules of the object.

• the total kinetic energy of the molecules of the object.

• the maximum energy of the molecules of the object.

• the average kinetic energy of the molecules of the object.

The specific heat capacity of a metal block of mass m is determined by placing a heating coil in its centre, as shown in the diagram above. The block is heated for time t and the maximum temperature change recorded is Δθ. The ammeter and voltmeter readings during the heating are I and V respectively. The specific heat capacity is best calculated using which one of the following expressions?

• 
• 
• 
• 

The main mechanism of convection is

• phase change

• molecules transfer kinetic energy

• different fluid density

• emission of electromagnetic waves

A black boy emits radiation with its greatest wavelength of λmax. The surface temperature of the black body doubles without any other change occuring. What is the wavelength at which the greatest intensity of radiation is emitted?

• λmax

• λmax/2

• λmax/4

• λmax/16

The specific latent heat of vaporization of a substance is greater than its specific latent heat of fusion because

• boiling takes place at a higher temperature than melting.

• thermal energy is required to raise the temperature from the melting point to the boiling point.

• the volume of the substance decreases on freezing but increases when boiling.

• the increase in potential energy of the molecules is greater on boiling than on melting.