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Thermodynamics — BITSAT Physics PYQs

32 previous year questions from Thermodynamics with answers and solutions. Numbered list, year tags, and one-tap solutions — built for serious JEE / NEET practice.

Thermodynamics — BITSAT Physics PYQs

In the given cycle A B C D A , the heat required for an ideal monoatomic gas will be

A gas can be taken from A to B via two different processes A C B and A D B . When path A C B is used 60 J of heat flows into the system and 30J of work is done by the system. If pa

A source supplies heat to a system at the rate of 1000 W . If the system performs work at a rate of 200 W . The rate at which internal energy of the system increases

On celcius scale the temperature of body increases by 40^ C . The increase in temperature on Fahrenheit scale is:

A hypothetical gas expands adiabatically such that its volume changes from 08 litres to 27 litres. If the ratio of final pressure of the gas to initial pressure of the gas is 16 81

A thermodynamic system is taken through cyclic process. The total work done in the process is :

An ideal gas at atmospheric pressure is adiabatically compressed so that its density becomes 32 times of its initial value. If the final pressure of gas is 128 atmospheres, the val

The compressibility of water is 4 10⁻⁵ per unit atmospheric pressure. The decrease in volume of 100 ~cm ³ of water under a pressure of 100 atmosphere will be

In an adiabatic process, the pressure is increased by 2 3 % . If = 3 2 , then the volume decreases by nearly

An ideal monoatomic gas at 300 K expands adiabatically to twice its volume. The final temperature of gas is

The pressure versus temperature graph of an ideal gas is shown in the figure below. If the density of gas at point A is &#961; 0 , then the density of the gas at point B will be

The figure shows the graph of p V T versus p for 2 &#215; 10 - 4 kg of hydrogen gas at two different temperatures, where p , V and T represents pressure, volume and temperature res

A reservoir is at 827 &deg; C and Carnot&#39;s engine takes a thousand kilo calorie of heat from it and exhausts it to a sink at 27 &deg; C . What is the amount of work and the eff

Helium gas goes through a cycle A B C D A (consisting of two isochoric and two isobaric lines) as shown in figure. The efficiency of this cycle is approximately

Figure below shows two paths that may be taken by a gas to go from a state A to a state (c) In process AB , 400 ~J of heat is added to the system and in process BC , 100 ~J of heat

A vessel of volume 20L contains a mixture of hydrogen and helium at temperature of 27^ C and pressure 2 atm. The mass of mixture is 5 ~g . Assuming the gases to be ideal, the ratio

One mole of O ₂ gas having a volume equal to 22.4 Litres at 0^ C and 1 atmospheric pressure in compressed isothermally so that its volume reduces to 11.2 litres. The work done in t

In a thermodynamic process, the pressure of a fixed mass of a gas is changed in such a manner that the gas releases 20 ~J of heat and 8 ~J of work is done on the gas. If the initia

Two balloons are filled one with pure he gas and other with air respectively. If the pressure and temperature of these balloons are same, then the number of molecules per unit volu

A thermodynamical system is changed from state ( P ₁, ~V ₁ ) to ( P ₂, ~V ₂ ) by two different process, the quantity which will remain same will be

A Carnot's heat engine works between the temperatures 427^ C and 27^ C . What amount of heat should it consume per second to deliver mechanical work at the rate of 1.0 ~kW ?

A vessel containing 1 more of O ₂ gas (molar mass 32) at temperature T . The pressure of the gas is p. An identical vessel containing one mole of he gas (molar mass 4 ) at temperat

Two gases occupy two containers A and B the gas in A , of volume 0.10 ~m ³, exerts a pressure of 1.40 MPa and that in B of volume 0.15 ~m ³ exerts a pressure 0.7 MPa . The two cont

A solid body of constant heat capacity 1 ~J / ^ C is being heated by keeping it in contact with reservoirs in two ways: (i) Sequentially keeping in contact with 2 reservoirs such t

Which of the following process is possible according to the first law of thermodynamics?

For an isothermal expansion of a perfect gas, the value of P P is equal to

A sample of ideal monoatomic gas is taken round the cycle ABCA as shown in the figure. The work done during the cycle is

In the equation PV ^ = constant, the value of is unity. Then the process is

An ideal refrigerator has a freezer at a temperature of 13^ C . The coefficient of performance of the engine is 5 . The temperature of the air (to which heat is rejected) is

A sample of gas expands from volume V ₁ to V ₂ . The amount of work done by the gas is greatest when the expansion is

A cyclic process is shown in the p-T diagram. Which of the curves show the same process on a P - V diagram?

Which one the following graphs represents the behaviour of an ideal gas

The pressure versus temperature graph of an ideal gas is shown in the figure below. If the density of gas at point A is ρ 0 , then the density of the gas at point B will be

The figure shows the graph of p V T versus p for 2 × 10 - 4 kg of hydrogen gas at two different temperatures, where p , V and T represents pressure, volume and temperature res

A reservoir is at 827 ° C and Carnot's engine takes a thousand kilo calorie of heat from it and exhausts it to a sink at 27 ° C . What is the amount of work and the eff