Question # 1

Which is the process in which temperature of the system remains constant.

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Adiabatic process

Isochoric process

Isothermal process

Isobaric process

When hot and cold water are mixed, the entropy.

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Decreases

Increases

Remain constant

Zero

No of spark plugs needed in the diesel engine are.

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0

1

2

3

Not change in entropy of a system after one complete Carnot cycle is.

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Positive

Negative

Zero

None of these

the change in internal energy is defined as

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Q - W

Q-T

Q + P

Q - P

The efficiency of a Carnot Heat Engine is 100% if temperature of sink T2 is.

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0 ^oC

0 K

0 ^oF

100 K

Entropy of measure of.

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Internal energy of system

Order of system

Disorder of system

Potential energy of system

Transformation of heat other forms of energy is discussed in

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Thermal physics

Thermodynamics

Atomic physics

Nuclear physics

The collision between the gas molecules is

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Elastic

Inelastic

Both a and b

None of these

In thermodynamics system internal energy decrease by 100 J and 100 J of work done on the system then heat lost will be.

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Zero

100 J

200 J

-200 J

The temperature scale which is independent of nature of substance is.

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Thermodynamic scale

Centigrade scale

Fahrenheit scale

Regnault scale

A constant temperature, if pressure of a given mass of gas is halved, then its volume becomes.

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Halve

Doubled

Four time

Constant

The kinetic energy of molecules of an ideal gas at absolute zero is

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Very low

Very high

Zero

First increases then decreases

Which one is true for isothermal process.

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Q = 0

W = 0

Q = W(D) Delta U = 0

None of these

The temperature of human body on Kelvin scale is

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210K

310K

410K

510K

Efficiency of a heat engine working between 27 ^oC and 32 ^oC will be.

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50%

90%

40%

62%

A system does 600 J of work and at the same time has its internal energy increased by 320 J. How much heat has been supplied.

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28o J

920 J

600 J

200 J

The difference between two molar capacities is equal to.

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Plank's constant

General gas constant

Molar gas constant

Boltzmann constant

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