Heat & Thermodynamics MCQs with Answers

Bimetallic strip is used in _?

• A.Electric iron
• B.Electric fan
• C.Electric heater
• D.Electric motor

What is the term for the random thermal motion of atoms, molecules, clusters of atoms, etc., in gases, liquids, and some solids?

• A.Brownian motion
• B.Diffraction
• C.Osmosis
• D.Convection

Enthalpy is defined as?

• A.Internal energy at constant temperature
• B.Heat content at constant volume
• C.Heat content at constant pressure
• D.Work done at constant pressure

The correct value of 0°C on the Kelvin scale is _?

• A.273.15 K
• B.273 K
• C.-273.15 K
• D.0 K

If the pressure of a given mass of gas is doubled at constant temperature, what will happen to its volume?

• A.Become doubled
• B.Become halved
• C.Remain unchanged
• D.Become four times

The heat engine operating in reverse is called ?

• A.Generator
• B.Turbine
• C.Refrigerator
• D.Compressor

What is volume considered as?

• A.Vector quantity
• B.Path function
• C.State function
• D.Intensive property

During the drilling of a metal surface the drill bit heats up. This heat comes from the _?

• A.Heat transferred from the surrounding air
• B.Chemical reaction between drill and metal
• C.Electrical resistance in the drill motor
• D.Work done against friction

Why does cooking occur more quickly in a pressure cooker?

• A.It increases the boiling point of water
• B.It decreases the boiling point of water
• C.It increases the freezing point of water
• D.It reduces the specific heat capacity of water

For all irreversible processes, the entropy of the system _?

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