Heat & Thermodynamics MCQs with Answers

If the pressure of a certain amount of gas is reduced to 1/4 of its initial pressure at a fixed temperature, then what would be its final volume?

• A.2 times
• B.4 times
• C.1/2 times
• D.1/4 times

The statement that is not true of radiation is that it ?

• A.Travels at the speed of light
• B.Always originates in the sun
• C.Can travel through vacuum
• D.Transfers energy without requiring a medium

Which one of the following is the best heat conductor?

• A.Silver
• B.Copper
• C.Aluminium
• D.Iron

What is the efficiency of a Carnot engine with source temperature 1000 K and sink temperature 250 K?

• A.25%
• B.50%
• C.75%
• D.100%

The heat of combustion is measured by ?

• A.Thermometer
• B.Bomb calorimeter
• C.Barometer
• D.Hygrometer

The value of universal gas constant (R) in SI units is?

• A.1.987 cal/mol·K
• B.0.0821 L·atm/mol·K
• C.8.314 J/mol·K
• D.62.36 L·torr/mol·K

The properties used for heat?

• A.Hot, Energy, Cold
• B.Mass, Volume, Density
• C.Length, Time, Temperature
• D.Force, Pressure, Work

What is the heat change called at constant pressure or temperature?

• A.Entropy (ΔS)
• B.Internal Energy (ΔU)
• C.Enthalpy (ΔH)
• D.Gibbs Free Energy (ΔG)

The melting point of Ice on Fahrenheit Scale is taken as _?

• A.0°F
• B.100°F
• C.32°F
• D.212°F

Intermolecular forces between molecules of ideal gas are ?

• A.Very strong
• B.Moderate
• C.Absent
• D.Weak but present