Question # 1

Which of following is irreversible process

Choose an answer

Slow compression of an elastic spring

Slow evaporation of substances in isolated vessel

Slow expansion of a gas

A chemical explosion

The efficiency of any heat engine can never be

Choose an answer

+ve

100%

-ve

None of these

A device based upon the thermodynamics property of matter is called.

Choose an answer

Calorimeter

Heat engine

thermometer

Voltmeter

The entropy of the universe with passage of time is.

Choose an answer

Increases

Decreases

Remain constant

Increases and decreases

the change in internal energy is defined as

Choose an answer

Q - W

Q-T

Q + P

Q - P

The number of spark plug needed in diesel engine is

Choose an answer

0

2

3

4

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

Choose an answer

0 ^oC

0 K

0 ^oF

100 K

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

Choose an answer

Double

Three fold

One half

Remains the same

The ideal gas law is.

Choose an answer

PV =NVk

P = NkT

PV =nRT

P=nRT

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

Choose an answer

Maximum

Zero

1/2 kx²

1/2 kx

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

Choose an answer

Isothermal expension

Isothermal compression

Adiabatic expansion

Adiabatic compression

Unite of thermodynamics scale of temperature is.

Choose an answer

Centigrade

Fahrenheit

Kelvin

Celsius

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

Choose an answer

100%

70%

60%

50%

During adiabatic process, which factor remains constant.

Choose an answer

Entropy

Pressure

Momentum

Power

Mercury is used as a thermometric substance because

Choose an answer

It is opaque

Does not stick to glass

Has low specific heat

All of these

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

Choose an answer

50%

90%

40%

62%

If heat engine absorb 400 J and rejects 200 J heat energy, its efficiency will be.

Choose an answer

25%

50%

70%

100%

Size of the molecules is much smaller as compared to the

Choose an answer

Mass of the molecules

Distance between the molecules

Density of the molecules

Volume of the molecules

More Classes

Other Links

Physics Fsc Part 1 Chapter 11 Online Test MCQs With Answers

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer