Heat & Thermodynamics MCQs with Answers

How much energy is required to boil a kettle of water containing 1 litre at 15°C? (Specific heat capacity of water = 4.18 kJ/kg·K)

• A.500 kJ
• B.418 kJ
• C.285 kJ
• D.355 kJ

A Carnot engine, with its cold body at 17°C, has 50% efficiency. If the temperature of its hot body is now increased by 145°C, the efficiency becomes _?

• A.80%
• B.66.67%
• C.75%
• D.60%

Which of the following is NOT a state function?

• A.Internal energy
• B.Enthalpy
• C.Work
• D.Entropy

If an enclosed gas container with a moveable piston is heated, what will happen?

• A.Mass of the gas will increase
• B.Volume will be decreased
• C.Pressure will remain constant
• D.Volume will be increased

Past Paper MCQ

Why does ice float on water?

• A.Because ice is denser than water
• B.Because water is denser than ice
• C.Because ice and water have the same density
• D.Because ice contains air bubbles

Normal human body temperature 98.6°F corresponds to _?

• A.37°C
• B.36°C
• C.38°C
• D.39°C

First law of Thermodynamics is the law of conservation of _?

• A.Momentum
• B.Energy
• C.Mass
• D.Charge

Linear thermal expansion of a solid depends upon ?

• A.Original length of the solid
• B.Increase in temperature
• C.Nature of the material
• D.All of these

During the isothermal process, the temperature _?

• A.First increases then decreases
• B.Increases gradually
• C.Decreases gradually
• D.Remains constant throughout the process

Following properties will decrease with increase in temperature except?

• A.Density
• B.Surface tension
• C.Vapor pressure
• D.Viscosity