Thermodynamics and Kinetic Theory — Practice

Question 1

How much heat is needed to raise the temperature of 2 kg of water by 10 °C? (specific heat of water = 4200 J kg⁻¹ K⁻¹)

Accepted Answer

A

Question 2

The heat required to melt 0.1 kg of ice at 0 °C is (latent heat of fusion = 3.36 × 10⁵ J/kg)

Accepted Answer

A

Question 3

100 J of heat is supplied to a gas, which does 40 J of work. The increase in its internal energy is

Accepted Answer

A

Question 4

In an isothermal expansion of an ideal gas, the change in internal energy is

Accepted Answer

A

Question 5

In an adiabatic process, which quantity is zero?

Accepted Answer

A

Question 6

At constant pressure, the absolute temperature of a fixed mass of ideal gas is doubled. Its volume

Accepted Answer

A

Question 7

The average translational kinetic energy of a gas molecule depends on

Accepted Answer

A

Question 8

If the absolute temperature of a gas is increased to 4 times its value, the rms speed of its molecules becomes

Accepted Answer

A

Question 9

At the same temperature, the rms speed of hydrogen molecules (M = 2) compared with oxygen molecules (M = 32) is

Accepted Answer

A

Question 10

For one mole of an ideal gas, the relation between the molar specific heats is

Accepted Answer

A

Question 11

The ratio of specific heats γ = Cp/Cv for a monatomic ideal gas is

Accepted Answer

A

Question 12

At ordinary temperatures, the number of degrees of freedom of a diatomic gas molecule is

Accepted Answer

A

Question 13

At constant temperature, if the pressure on a fixed mass of gas is doubled, its volume

Accepted Answer

A

Question 14

A Carnot engine works between 400 K and 300 K. Its maximum efficiency is

Accepted Answer

A

Question 15

A Carnot refrigerator operates between 300 K (hot) and 250 K (cold). Its coefficient of performance is

Accepted Answer

A

Practice — Thermodynamics and Kinetic Theory