Heat & Thermodynamics MCQs with Answers

Consider an ideal gas confined to a cylinder with a fixed piston. On heating the gas, all the heat supplied increases:

• A.Kinetic energy of the molecules
• B.Potential energy of the molecules
• C.Both kinetic and potential energy of the molecules
• D.Internal energy without any change in kinetic energy

If 200 ml of a gas at constant pressure is heated from 0°C to 100°C, the volume is corrected by multiplying by ?

• A.273/100
• B.273/373
• C.100/273
• D.373/273

Unequal expansion of metals makes possible the operation of ?

• A.Thermometers
• B.Thermostats
• C.Barometers
• D.Hydrometers

The molar specific heat at constant volume for polyatomic gas is _?

• A.Cv = 3R/2
• B.Cv = 5R/2
• C.Cv = 2R
• D.Cv = 3R

The temperature and pressure at which solid, liquid, and gaseous water coexist in equilibrium is called the of water.

• A.Critical point
• B.Boiling point
• C.Triple point
• D.Freezing point

The process of change of solid state into liquid state by absorption of heat is called ?

• A.Sublimation
• B.Freezing
• C.Condensation
• D.Melting

Boyle's law holds good only when?

• A.Pressure is constant
• B.Temperature is constant
• C.Volume is constant
• D.Mass is constant

Ice can be melted at a temperature below 0°C by applying pressure. The process is an example of a?

• A.Chemical change
• B.Spontaneous physical change
• C.Non-spontaneous physical change
• D.Irreversible chemical change

The rms speed at NTP of a gas can be calculated from the expression ?

• A.√(3RT/M)
• B.√(2RT/M)
• C.√(RT/M)
• D.√(3M/RT)

Which colour of clothes is a good reflector of heat?

• A.Black colour
• B.Blue colour
• C.Red colour
• D.White colour