حرارت اور حرکیاتِ حرارت

For a fixed mass of ideal gas in a rigid container, doubling the absolute temperature will:

• 1 Halve the pressure
• 2 Double the pressure
• 3 Leave the pressure unchanged
• 4 Quadruple the pressure

What is the efficiency of a Carnot engine working between 500 K and 300 K?

• 1 60%
• 2 20%
• 3 40%
• 4 80%

The average kinetic energy of the molecules of an ideal gas is proportional to:

• 1 Pressure
• 2 Absolute temperature
• 3 Volume
• 4 Mass of the gas

How much heat is needed to melt 0.5 kg of ice at 0 degrees C? (Latent heat of fusion = 334 kJ/kg)

• 1 167 kJ
• 2 334 kJ
• 3 668 kJ
• 4 83.5 kJ

In an isothermal process for an ideal gas, the change in internal energy is:

• 1 Positive
• 2 Negative
• 3 Zero
• 4 Equal to the work done on the gas