Question # 1

A finite volume of gas consists of

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Small no. of molecules

Large no. of molecule

Average no. of molecule

None of these

The potential energy to the molecules of an ideal gas is considered to be.

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Maximum

Zero

1/2 kx²

1/2 kx

Temperature of a gas is increased from 27 oC to 127 oC. The ratio of its mean K.E. will be

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3/4

9/16

4/3

10/9

The actual efficiency of property turned petrol engine is.

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20% to 30%

30% to 35%

40% to 45%

25% to 30%

The efficiency of heat engine whose sink is at 17 ^oC and source at 200 ^oC is.

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38%

63%

80%

90%

In case the work done in zero.

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Constant pressure

Constant volume

Constant temperature

Constant mass

The molecules of an ideal gas exert

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Force on each other

No force on each other

Large force on each other

Pressure on each other

An ideal heat engine can only be 100% efficient if its cold temperature reservoir is at.

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0 K

0 ^oC

100 K

100 ^oC

If heat is added to a system, then its entropy will.

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Increases and positive

Decrease and positive

Increases but negative

Decreases but negative

The internal energy of a piece of lead when beaten by hammer will.

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Increase

Decrease

Remains constant

Increases and then decrease

During adiabatic process, which factor remains constant.

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Entropy

Pressure

Momentum

Power

At constant temperature and pressure, if volume of given mass of a gas is doubled then density is.

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Doubled

1/4 original

1/2 of original

Unchanged

Boltzman constant 'k' has same unit as.

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Temperature

Energy

Entropy

Pressure

Unite of thermodynamics scale of temperature is.

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Centigrade

Fahrenheit

Kelvin

Celsius

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

Entropy of measure of.

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Internal energy of system

Order of system

Disorder of system

Potential energy of system

In the thermodynamics process , the equation W = -delta U represents.

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Isothermal expension

Isothermal compression

Adiabatic expansion

Adiabatic compression

At which of the following temperature a body has maximum internal energy.

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-273 ^oC

0 K

273 K

-273 K

The unit o pressure of gas is

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Nm^-2

Pascal

Atmosphere

All of these

Value of triple point of water is given as.

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Zero K

100 K

273.16 K

373.16 K

A diatomic gas molecules has

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Translational energy only

Rotational energy only

Vibrational energy only

All translational, Rotational and vibrational energy

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 entropy of the universe with passage of time is.

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Increases

Decreases

Remain constant

Increases and decreases

First law of thermodynamics can be defined by the equation

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

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Thermodynamic scale

Centigrade scale

Fahrenheit scale

Regnault scale

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