Heat & Thermodynamics MCQs with Answers

A frictionless piston-cylinder based enclosure contains some amount of gas at a pressure of 400 kPa. Then heat is transferred to the gas at constant pressure in a quasi-static process. The piston moves up slowly through a height of 10 cm. If the piston has a cross-sectional area of 0.3 m², the work done by the gas in this process is _?

• A.12 kJ
• B.10 kJ
• C.15 kJ
• D.8 kJ

Boiling point of a liquid is the temperature at which _?

• A.Vapour pressure is double the atmospheric pressure
• B.Vapour pressure becomes zero
• C.Vapour pressure is less than the atmospheric pressure
• D.Vapour pressure equals the atmospheric pressure

Internal Energy is a function of _.

• A.Density
• B.Pressure
• C.Volume
• D.Temperature

Which one is not related to evaporation?

• A.Cooling process
• B.Surface phenomenon
• C.Exothermic
• D.Liquid to gas phase change

"The amount of heat evolved or absorbed in a chemical reaction is the same whether the reaction takes place in one step or several steps" is the statement of?

• A.Dalton's law
• B.Henry's law
• C.Raoult's law
• D.Hess's law

In a sample of a substance, at any given temperature the energy of all particles will?

• A.Be the same
• B.Not be same
• C.Be zero
• D.Be inversely proportional to temperature

Which is the average translational kinetic energy of molecules in a gas at temperature 27°C?

• A.6.21 × 10⁻²¹ J
• B.3.11 × 10⁻²¹ J
• C.9.32 × 10⁻²¹ J
• D.1.24 × 10⁻²⁰ J

The measurement of the hotness of an object is called?

• A.Heat
• B.Temperature
• C.Thermal energy
• D.Calorimetry

Which thermodynamic temperature is equivalent to 501.25°C?

• A.775.25 K
• B.774.40 K
• C.774.85 K
• D.773.15 K

Heat is the form of _?

• A.Energy
• B.Matter
• C.Force
• D.Pressure