During the adiabatic expansion of 2 moles of a gas, the internal energy of the gas is found to decrease by 2 joules, the work done during the process by the gas will be equal to -

(1) 1 J

(2) –1 J

(3) 2 J

(4) – 2 J

Concept Questions :-

First law of thermodynamics
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

If $\gamma$ denotes the ratio of two specific heats of a gas, the ratio of slopes of adiabatic and isothermal PV curves at their point of intersection is

(1) $\frac{1}{\gamma }$

(2) $\gamma$

(3) $\gamma -1$

(4) $\gamma +1$

Concept Questions :-

Types of processes
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Air in a cylinder is suddenly compressed by a piston, which is then maintained at the same position. With the passage of time

(1) The pressure decreases

(2) The pressure increases

(3) The pressure remains the same

(4) The pressure may increase or decrease depending upon the nature of the gas

Concept Questions :-

Types of processes
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The adiabatic Bulk modulus of a perfect gas at pressure P is given by

(1) P

(2) 2P

(3) P/2

(4) γ P

Concept Questions :-

Types of processes
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

An adiabatic process occurs at constant

(1) Temperature

(2) Pressure

(3) Heat

(4) Temperature and pressure

Concept Questions :-

Types of processes
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

A polyatomic gas $\left(\gamma =\frac{4}{3}\right)$ is compressed to $\frac{1}{8}$ of its volume adiabatically. If its initial pressure is P0, its new pressure will be -

(1) 8 P0

(2) 16 P0

(3) 6 P0

(4) 2 P0

Concept Questions :-

Types of processes
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

For adiabatic processes $\left(\gamma =\frac{{C}_{p}}{{C}_{v}}\right)$

(1) ${P}^{\gamma }V$ = constant

(2) ${T}^{\gamma }V$ = constant

(3) $T{V}^{\gamma -1}$ = constant

(4) $T{V}^{\gamma }$ = constant

Concept Questions :-

Types of processes
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

An ideal gas is expanded adiabatically at an initial temperature of 300 K so that its volume is doubled. The final temperature of the hydrogen gas is (γ = 1.40)      [Given :  ]

(1) 227.36 K

(2) 500.30 K

(3) 454.76 K

(4) –47°C

Concept Questions :-

Types of processes
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

In an adiabatic expansion of a gas initial and final temperatures are T1 and T2 respectively, then the change in internal energy of the gas is -

(1) $\frac{R}{\gamma -1}\left({T}_{2}-{T}_{1}\right)$

(2) $\frac{R}{\gamma -1}\left({T}_{1}-{T}_{2}\right)$

(3) R(T1T2)

(4) Zero

Concept Questions :-

First law of thermodynamics
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Helium at 27°C has a volume of 8 litres. It is suddenly compressed to a volume of 1 litre. The temperature of the gas will be [γ = 5/3]

(1) 108°C

(2) 9327°C

(3) 1200°C

(4) 927°C

Concept Questions :-

Types of processes