ECAT Pre General Science Physics Chapter 11 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 11 Heat & Thermodynamics

Try The MCQ's Test For ECAT Pre General Science Physics Chapter 11 Heat & Thermodynamics

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ECAT Pre General Science Physics Chapter 11 Heat & Thermodynamics

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Question # 1

An amount of water of mass 20 g at 0°C is mixed with 40 g of water at 10°C. Final temperature of mixture is

Question # 2

Tick the correct pair when M denotes the molecular mass and other symbols carry usual meanings:

Question # 3

When the temperature of source and sink of a heat engine become equal entropy change will be

Question # 4

Heat required to raise the temperature of one mole of a gas through 1 K at constant pressure is called

Question # 5

A carnot cycle consists of

Question # 6

The example of reversible process is

Question # 7

When two objects come to common temperature, the body is said to be in:

Question # 8

The temperature of gas is produced by

Question # 9

In the reverse process, the working substance passes through the same stages as in the direct process and

Question # 10

In the study of thermodynamics, which gas is considered as the working substance

Question # 11

The temperature scale approved in SI units is:

Question # 12

The product of the pressure and volume of an ideal gas is

Question # 13

Real gases strictly obey gas law at:

Question # 14

The curve representing an isothermal process is called

Question # 15

The highest efficiency of a heat engine whose low temperature is 17°C and the high temperature is 200°C is

Question # 16

The efficiency of diesel engine is

Question # 17

The internal energy of a system does not depend upon the

Question # 18

If an amount of heat enters the system it could

Question # 19

In an ideal gas, the molecules have:

Question # 20

At what temperature the adiabatic change is equivalent to the isothermal change?

Question # 21

The second law of thermodynamics is concerned with the circumstances in which

Question # 22

On the power stroke, a spark fires the mixtures causing a rapid increase in pressure and temperature and the burning mixture expands

Question # 23

Rice takes longest to cook

Question # 24

Good absorbers of heat are

Question # 25

A process which can be retraced in exactly reverse order, without producing any change in the surroundings is called

Question # 26

If R is gas constant for 1 gram mole, Cpand Cvare specific heat for a solid then

Question # 27

A heat engine is that which converts

Question # 28

In case of an ideal gas, the P.E associated with its molecule is

Question # 29

What temperature is the same on Celsius scale as well as on Fahrenheit scale?

Question # 30

In the formula P = N0KT, N0denotes:

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 The work done by the system on its environment is considered as
A. positive
B. negative
C. zero
D. any one of them
2 Which quantity is important in stating the entropy of the system
A. initial entropy
B. final entropy
C. change in entropy
D. none of them
3 If denotes the total number of molecules in cubic vessel such that m is mass of each milecule and I is length of each side of vessel, then mN/I3gives the:
A. Force
B. Density
C. Work done
D. Pressure
4 At constant volume temperature is increased. Then
A. Collision on walls will be less
B. Number of collisions per unit time will increase
C. Collision will be in straight lines
D. Collision will not change
5 A diatomic gas molecule has
A. translational energy
B. rotaional energy
C. vibrational energy
D. all of them
6 Truth of kinetic energy is confirmed by:
A. Diffusion of gases
B. Brownian motion
C. Both A and B
D. None of these
7 R.M.S velocity of a particle is V at pressure P. If pressure increases by two times, then R.M.S velocity becomes
A. 2V
B. 3V
C. 0.5V
D. V
8 The ideal gas law is
A. P = nRT
B. V = nRT
C. PV =RT
D. PV =nRT
9 The highest efficiency of a heat engine whose low temperature is 17°C and the high temperature is 200°C is
A. 70%
B. 100%
C. 35%
D. 38%
10 The percentage of available heat energy converted into work by a diesel engine is roughly
A. 35 %`
B. 40 %
C. 35 - 40 %
D. 25 %

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