A thermodynamic system is taken through the cycle ABCD as shown in figure. Heat rejected by the gas during the cycle is (a)2 pV                                     (b)4 pV

(c)$\frac{1}{2}pV$                                    (d)pV

Concept Questions :-

First law of thermodynamics
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Difficulty Level:

One mole of an ideal gas from an initial state B undergoes via two processes. It first undergoes isothermal expansion from volume V to 3V and then its volume is reduced from 3V to V at constant pressure. The correct P-V diagram representing the two processes is - Concept Questions :-

Types of processes
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Difficulty Level:

An ideal gas goes from state A to state B

via three different processes as indicated

in the p-V diagram

If  indicates the heat absorbed

by the gas along the three processes and

indicates the change in

internal energy along the three processes

respectively, then (a)

(b)

(c)

(d)

Concept Questions :-

First law of thermodynamics
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Difficulty Level:

A mass of diatomic gas ($\gamma$=1.4) at a pressure of 2 atm is compressed adiabatically so that its temperature rise from $27°\mathrm{C}$ to $927°\mathrm{C}.$ The pressure of the gas is final state is-

(a) 28 atm                                            (b) 68.7 atm

(c) 256 atm                                           (d) 8 atm

Concept Questions :-

Types of processes
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Difficulty Level:

If  represent the increase in internal energy and work done by the system respectively in a thermodynamical process,which of the following is true?

(a) $∆U=-∆W,$ in a adiabatic process

(b) $∆U=∆W,$ in a isothermal process

(c) $∆U=∆W,$ in adiabatic process

(d) $∆U=-∆W,$in a isothermal process

Concept Questions :-

Types of processes
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Difficulty Level:

A monoatomic gas at pressure ${\mathrm{p}}_{1}$ and ${\mathrm{V}}_{1}$ is compressed adiabatically to $\frac{1}{8}\mathrm{th}$ its original volume. What is the final pressure of the gas ?

(a)                                    (b) ${\mathrm{p}}_{1}$

(c)                                     (d)

Concept Questions :-

Types of processes
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Difficulty Level:

The internal energy change in a system that has absorbed 2 kcal of heat and done 500 J of work is

(a) 8900 J                                      (b) 6400 J

(c) 5400 J                                      (d) 7900 J

Concept Questions :-

First law of thermodynamics
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Difficulty Level:

In thermodynamic processes which of the following statements is not true?

(a) In an adiabatic process the system is insulated from the surroundings

(b) In an isochoric process pressure remains constant

(c) In an isothermal process the temperature remains constant

(d) In an adiabatic process $p{V}^{\gamma }=$constant

Concept Questions :-

Types of processes
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Difficulty Level:

If Q, E and W denote respectively the heat added, change in internal energy and the work done in a closed cyclic process, then

(a) W=0                                  (b) Q=W=0

(c) E=0                                   (d) Q=0

Concept Questions :-

Cyclic process
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Difficulty Level:

At ${10}^{°}C$ the value of the density of a fixed mass of an ideal gas divided by its pressure is x. At ${110}^{°}C$ this ratio is

(a) x

(b)$\frac{383}{283}x$

(c)$\frac{10}{110}x$

(d) $\frac{283}{383}x$

Concept Questions :-

Basic terms