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
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Difficulty Level:

If the volume of the given mass of a gas is increased four times and the temperature is raised from 27°C to 127°C. The isothermal elasticity will become

(a) 4 times                                (b) 1/4 times

(c) 3 times                                (d) 1/3 times

Concept Questions :-

Types of processes
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Difficulty Level:

A system performs work ΔW when an amount of heat is ΔQ added to the system, the corresponding change in the internal energy is ΔU. A unique function of the initial and final states (irrespective of the mode of change) is -

(1) ΔQ

(2) ΔW

(3) ΔU and ΔQ

(4) ΔU

Concept Questions :-

First law of thermodynamics
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Difficulty Level:

A container of volume 1m3 is divided into two equal compartments by a partition. One of these compartments contains an ideal gas at 300 K. The other compartment is vaccum. The whole system is thermally isolated from its surroundings. The partition is removed and the gas expands to occupy the whole volume of the container. Its temperature now would be -

(1) 300 K

(2) 239 K

(3) 200 K

(4) 100 K

Concept Questions :-

First law of thermodynamics
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Difficulty Level:

110 J of heat is added to a gaseous system, whose internal energy change is 40 J, then the amount of external work done is

(1) 150 J

(2) 70 J

(3) 110 J

(4) 40 J

Concept Questions :-

First law of thermodynamics
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Difficulty Level:

Which of the following is not thermodynamical function ?

(1) Enthalpy

(2) Work done

(3) Gibb's energy

(4) Internal energy

Concept Questions :-

Basic terms
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Difficulty Level:

When the amount of work done is 333 cal and change in internal energy is 167 cal, then the heat supplied is -

(1) 166 cal

(2) 333 cal

(3) 500 cal

(4) 400 cal

Concept Questions :-

First law of thermodynamics
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Difficulty Level:

First law thermodynamics states that

(1) System can do work

(2) System has temperature

(3) System has pressure

(4) Heat is a form of energy

Concept Questions :-

First law of thermodynamics