JEE 2020 Physics:Thermodynamics Quiz (09.07.2019)

In thermodynamic process pressure of a fixed mass of gas is changed in such a manner that the gas releases 30 joule of heat and 18 joule of work was done on the gas. If the initial internal energy of the gas was 60 joule, then, the final internal energy will be :

A cylinder made of perfectly non conducting material closed at both ends is divided into two equal parts by a heat proof piston. Both parts of the cylinder contain the same masses of a gas at a temperature t₀ = 27° and pressure P₀ = 1 atm. Now if the gas in one of the parts is slowly heated to t = 57°C while the temperature of first part is maintained at t₀ the distance moved by the piston from the middle of the cylinder will be (length of the cylinder = 84 cm)

Two identical vessels A & B contain equal amount of ideal monoatomic gas. The piston of A is fixed but that of B is free. Same amount of heat is absorbed by A & B . If B’s internal energy increases by 100 J the change in internal energy of A is

When a system is taken from state ’a’ to state ‘b’’ along the path ‘acb’’, it is found that a quantity of heat Q = 200 J is absorbed by the system and a work W = 80 J is done by it. Along the path ’adb’, Q = 144J. If U_a = 40 J, value of U_b will be

In a thermodynamic process, 185 moles of an ideal diatomic gas is kept in a cylinder at temperature. On supplying heat to the gas, its temperature remains constant but 20 moles get dissociated into atoms. Find the heat supplied to the gas. Assume that

Three processes from a thermodynamic cycle as shown on P-V diagram for an ideal gas. Process 1 → 2 takes place at constant temperature (300 K). Process 2 → 3 takes place at constant volume. During this process 40J of heat leaves the system. Process 3 → 1 is adiabatic and temperature T₃ is 275K. Work done by the gas during the process 3 → 1 is

When unit mass of water boils to become steam at 100°C, it absorbs Q amount of heat. The densities of water and steam at 100°C are ρ₁ and ρ₂ respectively and the atmospheric pressure is p₀. The increase in internal energy of the water is

A ideal monoatomic gas is carried around the cycle ABCDA as shown in the fig. The efficiency of the gas cycle is

One mole of an ideal gas at temperature T₁ expands slowly according to the law P/V = constant. If the final temperature is T₂, work done by the gas equals