Standard Books Physics Thermodynamics Class 11 Questions

"Two systems in thermal equilibrium with a third system separately are in thermal equilibrium with each other." This statement is

System in which there is no exchange of matter, work or energy from surroundings is

U = q + w, is mathematical expression for

Internal energy of an ideal gas depends upon

Which of the following is not a path function?

The work done during the expansion of a gas from 4 dm³ to 6 dm³ against a constant external pressure of 3 atm is (1 L atm = 101.32 J)

An electric heater supplies heat to a system at a rate of 120 W. If system performs work at a rate of 80 J s⁻¹, the rate of increase in internal energy is

If w is the amount of work done by the system and q is the amount of heat supplied to the system, identify the type system of the system.

A vessel has 6 g of oxygen at pressure P and temperature 400 K. A small hole is made in it so that oxygen leaks out. How much oxygen leaks out if the final pressure is $\frac{P}{2}$ and temperature 300 K?

An ideal gas undergoing a change of state from A to B through four different paths I, II, III and IV as shown in the P-V diagram that lead to the same change of state, then the change in internal energy is

A process is called reversible when

A cylinder contains 10 kg of gas at a pressure of $10^7$ N m$^{-2}$. The quantity of gas taken out of the cylinder, if final pressure is $2.5 \times 10^6$ N m$^{-2}$ is

For an isothermal reversible expansion process, the value of q can be calculated by the expression

1 kg of water is heated from 40°C to 70°C. If its volume remains constant, then the change in internal energy is (specific heat of water = 4148 J kg⁻¹ K⁻¹)

A gas at 300 K has pressure $4 \times 10^{-10}$ N m$^{-2}$. If $k_B = 1.38 \times 10^{-23}$ J K$^{-1}$, the number of molecules per cm$^3$ is of the order of

The relation between the slope of isothermal curve and slope of adiabatic curve

In an adiabatic expansion of ideal gas

Two litres of an ideal gas at a pressure of 10 atm expands isothermally into a vacuum until its total volume is 10 litres. How much heat is absorbed and how much work is done in the expansion?

When the temperature of a gas filled in a closed vessel is increased by 1°C, its pressure increases by 0.4 percent. The initial temperature of gas was

For a gas of molecular weight M, specific heat capacity at constant pressure is γ = $\frac{C_p}{C_v}$

The enthalpy change of a reaction does not depend upon

Two moles of oxygen is mixed with eight moles of helium. The effective specific heat of the mixture at constant volume is

Consider the given diagram for 1 mole of a gas X and answer the following question. The process A → B represents

One mole of an ideal monatomic gas at temperature $T_0$ expands slowly according to the law $\frac{P}{V} =$ constant. If the final temperature is $2T_0$, heat supplied to the gas is

The amount of heat supplied to $4 \times 10^{-2}$ kg of nitrogen at room temperature to rise its temperature by 50°C at constant pressure is (Molecular mass of nitrogen is 28 and $R = 8.3 \text{ J mol}^{-1} \text{ K}^{-1}$)

Which of the following relationships is not correct for the relation between ΔH and ΔU?

According to the first law of thermodynamics, ΔU = q + w. In special cases the statement can be expressed in different ways. Which of the following is not a correct expression?

A sample of ideal gas (γ = 1.4) is heated at constant pressure. If 100 J of heat is supplied to the gas the work done by the gas is

What amount of heat must be supplied 35 g oxygen at room temperature to raise its 80°C at constant volume? (molecular mass of oxygen is 32 and R = 8.3 J mol⁻¹ K⁻¹)

A system changes from state X to Y with a change in internal energy measuring to 25 kJ mol⁻¹, by a reversible path and returns from Y to X by an irreversible path. What will be the net change in internal energy?

Heat is supplied to a diatomic gas at pressure. The ratio of ΔQ : ΔU : W is

200 joules of heat was supplied to a system at constant volume. It resulted in the increase in temperature of the system from 29R to 323 K. What is the change in internal energy of the system?

A 10 kW drilling machine is used to drill a bore in a small aluminium block of mass 8 kg. Find the rise in temperature of the block in 2.5 minutes, assuming 50% power is used up in heating the machine itself or lost to the surroundings. (Specific heat of aluminium = 0.91 J g⁻¹ °C⁻¹)

In thermodynamics, which one of the following properties is not an intensive property?

The temperature of equal masses of three different liquids A, B and C are 12°C, 19°C and 28°C respectively. The temperature when A and B are mixed is 16°C and when B and C are mixed is 23°C. The temperature when A and C are mixed is

The specific heat of air at constant 0.172 Cal g⁻¹°C⁻¹. The change in internal energy when 5g of air is heated from 0°C to 4°C at constant volume is

The molar heat capacity of water at constant pressure, Cₚ is 75 J K⁻¹ mol⁻¹. When 10 kJ of heat is supplied to 1 kg water which is free to expand, the increase in temperature of water is

At what temperature will the speed of sound in air be 3 times its value at 0°C?

Match the column I (type of processes) with column II (feature).

For the reaction of one mole of zinc dust with one mole of sulphuric acid in a bomb calorimeter, ΔU and w correspond to

A block of ice at −8°C is slowly heated and converted to steam at 100°C. Which of the following curves represents the phenomena qualitatively?

In the reaction : S + 3/2 O₂ → SO₃ + 2x kcal and SO₂ + 1/2 O₂ → SO₃ + y kcal, heat of formation of SO₂ in kcal is

According to equipartition law of energy each particle in a system of particles have thermal E equal to

If 10 g of ice is added to 40 g of water at 15°C, then the temperature of the mixture is (specific heat of water = 4.2 × 10³ J kg⁻¹ K⁻¹, Latent heat of fusion of ice = 3.36 × 10⁵ J kg⁻¹)

If R is universal gas constant, the amount of needed to raise the temperature of 2 moles of an ideal monatomic gas from 273 K to 373 K when no work is done is

Formation of ammonia is shown by the reaction, N₂(g) + 3H₂(g) → 2NH₃(g); ΔH° = -91.8 kJ mol⁻¹. What will be the enthalpy of reaction for the decomposition of NH₃ according to the reaction? 2NH₃(g) → N₂(g) + 3H₂(g); ΔH° = ?

The given P-V diagram shows expansion of a gas. Which one of the following statement is true?

A gas mixture consists of 2 moles of oxygen and 4 moles of argon at temperature T. Neglecting all vibrational modes, the total internal energy of the system is

If an ideal gas undergoes isothermal process from some initial state i to the final state f, then the change in internal energy during this process is

Which of the following relationship is not correct?