Question # 1

The efficiency of diesel engine is about

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25% to 30%

35% to 40%

40% to 50%

50% to 60%

The ideal gas law is.

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PV =NVk

P = NkT

PV =nRT

P=nRT

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

A diatomic gas molecules has

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Translational energy only

Rotational energy only

Vibrational energy only

All translational, Rotational and vibrational energy

In reversible process the entropy of system.

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Remain constant

Decrease

Increase

Becomes zero

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

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Adiabatic process

Isochoric process

Isothermal process

Isobaric process

Which remains constant in an adiabatic process.

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Volume

Pressure

entropy

temperature

Mercury is used as a thermometric substance because

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It is opaque

Does not stick to glass

Has low specific heat

All of these

The mean kinetic energy of gas is at.

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0 ^oC

-273 ^oC

100 K

100 ^oC

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

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Isothermal expension

Isothermal compression

Adiabatic expansion

Adiabatic compression

Pascal is the unit of

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Pressure

Force

Tension

Weight

Carnot cycle consists of.

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Two steps

Three steps

Four steps

Five steps

The temperature of human body on Kelvin scale is

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210K

310K

410K

510K

The internal energy of system does not depend on

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Temperature

Pressure

Path

Final and initial state

The collision between the gas molecules is

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Elastic

Inelastic

Both a and b

None of these

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

Value of triple point of water is given as.

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Zero K

100 K

273.16 K

373.16 K

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