Chapter Test: Thermodynamics -2 JEE Physics Free MCQs

A mixture of 8gm of helium and 14gm of nitrogen is enclosed in a vessel of constant volume at 300K. The quantity of heat absorbed by the mixture to double the root mean velocity of its molecules is –

(R = universal gas constant )

One mole of ideal monoatomic gas is taken along a cyclic process as shown in the figure. Process

1 → 2 shown is 1/4^th part of a circle as shown by dotted line process 2 → 3 is isochoric while

3 → 1 is isobaric. If efficiency of the cycle is n% where n is an integer. Find n.

n moles of an ideal gas undergoes a process A to B as shown. Maximum temperature of gas during the process is –

An ideal gas is expanded so that amount of heat given is equal to the decrease in internal energy. The gas undergoes the process TV^1/5 = constant. The adiabatic compressibility of gas when pressure is P, is –

The pressure volume graph of an ideal gas cycle is shown in the fig. The adiabatic process is described by

In a given process of an ideal gas, dW = 0 and dQ < 0. Then for the gas –

The molar heat capacity for the process is xR, where R is gas constant, when 10 J of heat added to a monoatomic ideal gas, then gas performs a work of 5 J on its surrounding, then x is.

The figure shows two isotherms at temperatures T₁ and T₂. A gas is taken from one isotherm to another isotherm through different processes. Then change in internal energy ΔU has relation -

For one complete cycle of a thermodynamic process on a gas as shown in the P-V diagram. Which of the following is correct ?

The ratio of two specific heats of CO, C_P/C_V is-

1 mole of a monoatomic and 2 mole of diatomic gas are mixed, Now the resulting gas is taken through a process in which molar heat capacity was found 3R. Polytropic constant in the process is -

For an ideal gas graph is shown for three processes. Processes 1, 2, and 3 are respectively –

In an adiabatic expansion of air the volume increases by 5%. What is the percentage change in pressure ? [(1.05)^7/5 = 1.07]

A carnot engine works between ice point and steam point. It is desired to increase efficiency by 20%, by changing temperature of sink to –

Pressure versus temperature graph of an ideal gas is as shown in figure corresponding density (ρ) versus volume (V) graph will be -

Find the amount of work done to increase the temperature of one mole of an ideal gas by 30ºC if it is expanding under the condition V ∝ T^2/3 -

Kelvin- Planck statement states that

For proper utilization of exergy, it is desirable to make first law efficiency ____ and the source and use temperatures should ____.

If the door of refrigerator is left open inside a closed room, what would happen to the temperature of the room?

Refrigerator transfers heat from the cold cooling coils to warm surroundings, which law of thermodynamics favour this process

What amount of work is needed to freeze 1 gm of water at 0˚C in a refrigerator .The temperature of surroundings is 320 K?

The coefficient of performance of a refrigerator is given by