Heat & Thermodynamics MCQs with Answers

Pressure of a gas is directly proportional to _?

• A.Density of the gas
• B.Volume of the gas
• C.Kinetic energy
• D.Temperature in Celsius

A system absorbs 80 J through heating while doing 100 J of work. What is the change in the internal energy of the system?

• A.+180 J
• B.+20 J
• C.-20 J
• D.-180 J

In which unit are gas bills typically charged?

• A.Kilowatt-hour (kWh)
• B.British Thermal Unit (BTU)
• C.Cubic meter (m³)
• D.Joule (J)

If a gas expands suddenly, then its:

• A.Temperature decreases
• B.Temperature increases
• C.Temperature remains constant
• D.Pressure increases

Radiation is the chief method of energy transfer _?

• A.From a hot iron rod to its handle
• B.From the earth's surface to the atmosphere
• C.From the ocean depths to the surface
• D.From the sun to an earth satellite

In which of the systems listed below is the entropy decreasing?

• A.A solid dissolves in water
• B.A solid melts into a liquid
• C.A liquid evaporates into a gas
• D.A gas is cooled

Which of the following is true about air in terms of heat conduction?

• A.Air is a good conductor of heat
• B.Air is a bad conductor of heat
• C.Air conducts heat only at high temperatures
• D.Air conducts heat only in the presence of moisture

How can a bearing be removed from a shaft?

• A.By heating
• B.By cooling
• C.By applying lubricant
• D.By hammering

The conversion factor for converting Celsius to Fahrenheit is:

• A.9/5
• B.5/9
• C.32/9
• D.9/32

The change from liquid to solid, or the reverse of melting, is called?

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