Question # 1

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 change in internal energy is defined as

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Q - W

Q-T

Q + P

Q - P

A cycle of petrol engine undergoes

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Two process

Three process

Four process

single process

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

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

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50%

90%

40%

62%

A Carnot engine has an efficiency of 50% when its sink temperature is at 27 ^oC. The temperature of source.

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273^oC

300 ^oC

327 ^oC

373 ^oC

The Carnot cycle can be shown by which graph

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P - T graph

P - V Graph

V- T graph

PV -T graph

A heat engine operates between the temperature 1000 K and 400 K, Its efficiency is.

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100%

70%

60%

50%

The mean kinetic energy of gas is at.

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0 ^oC

-273 ^oC

100 K

100 ^oC

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

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

For working of heat engine, there must be.

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A source

A sink

either of these

Both of these

According to first law of thermodynamics the quantity which is conserved.

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Force

Momentum

Energy

Power

No of spark plugs needed in the diesel engine are.

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0

1

2

3

The measure of hotness or coldness of a substance is.

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Temperature

Heat

Internal energy

Energy

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%

The efficiency of diesel engine is about

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25 % to 30%

35% to 40%

40% to 50%

50% to 60%

For a gas obeying Boyle's Law, if the pressure is doubled, the volume becomes.

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Double

Three fold

One half

Remains the same

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