Heat & Thermodynamics MCQs with Answers

The classical expression for the mean energy of a one-dimensional oscillator is?

• A.KBT
• B.2KBT
• C.KBT/2
• D.KBT/2 + KBT/2

When water freezes its density _?

• A.First increases then decreases
• B.Increases
• C.Remains the same
• D.Decreases

A fixed temperature at which a pure liquid boils is called ?

• A.Melting point
• B.Boiling point
• C.Freezing point
• D.Condensation point

Rate of evaporation of a liquid can be increased by _?

• A.Increasing atmospheric pressure
• B.Keeping atmospheric pressure constant
• C.Decreasing atmospheric pressure
• D.Atmospheric pressure has no effect on evaporation

1 BTU is equal to _ Joules.

• A.1000
• B.1020
• C.1100
• D.1055

A thermometer is made up of a glass tube which is filled with?

• A.Alcohol
• B.Water
• C.Mercury
• D.Nitrogen

Which of the following processes has zero entropy change?

• A.Isothermal
• B.Adiabatic
• C.Isobaric
• D.Isochoric

The solubility of a solute substance increases _?

• A.As the liquid heats up
• B.As the liquid cools down
• C.When the liquid is at freezing point
• D.When the liquid is at room temperature only

A heat engine operates between two temperatures, 500 K and 300 K. What is its efficiency?

• A.20%
• B.40%
• C.60%
• D.80%

The heat from Sun reaches to Earth in form of waves called _?

• A.Conduction
• B.Convection
• C.Radiation
• D.None of these