ECAT Pre Engineering Physics Chapter 11 MCQ Test With Answer

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

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

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Physics ECAT Pre Engineering Chapter 11 Heat & Thermodynamics

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Question # 1

The unit of thermodynamical scale is

Question # 2

The efficiency of diesel engine is

Question # 3

While deriving equation of pressure by kinetic theory of gases, we take into account:

Question # 4

An irreversible heat flow from a hot to cold substances of a system, causes the disorder to

Question # 5

If the formula PV = nRT, n denotes:

Question # 6

In the theory of dimensional analysis, heat may be properly represented by:

Question # 7

10 c.c. each of oxygen and hydrogen are kept in separate flasks. Then which of the following relations is correct?

Question # 8

The behaviour of gases is well accounted by the kinetic theory based on

Question # 9

Specific heat at constant pressure is greater than the specific heat at constant volume because

Question # 10

The efficiency of petrol engine is usually not more than 25% to 30% because of

Question # 11

The bicycle pump provides a good example of

Question # 12

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

Question # 13

The example of irreversible process is

Question # 14

The disorder in the system increases due to the

Question # 15

The temperature of gas is produced by

Question # 16

The work done by the system on its environment is considered as

Question # 17

If a molecule with momentum mv strikes a wall and rebound then the change in momentum will be:

Question # 18

The percentage of available heat energy converted into work by a petrol engine is roughly

Question # 19

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

Question # 20

Melting point of ice

Question # 21

For the working of a heat engine, there must be

Question # 22

Amount of heat required to raise the temperature of a body through 1 K is called its

Question # 23

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

Question # 24

If a system undergoes a natural process it will go in the direction that causes the entropy of the system plus the environment to increase, this is another statement of

Question # 25

In all natural processes where heat flows from one system to another, there is always a net

Question # 26

In the formula P = N0KT, N0denotes:

Question # 27

When heat is added into the system then change in entropy is

Question # 28

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

Question # 29

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 # 30

The rate of change of momentum of a molecule is equal to:

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 If an amount of heat enters the system it could
A. decrease the internal energy
B. not change the internal energy
C. increase the internal energy
D. none of them
2 We cannot utilize the heat contents of oceans and atmosphere because
A. there is no reservoir at the same temperature
B. there is no reservoir at the temperature lower than any one of two
C. there is no reservoir at the temperature higher than any one of two
D. none of them
3 The curve representing an isothermal process is called
A. adiabat
B. isotherm
C. fixed temperature
D. none of them
4 If a process cannot be retraced in the backward direction by reversing the controlling factors, it is
A. a reversible process
B. an irreversible process
C. any one of them
D. both of them
5 According to the second law, which is must to produce work
A. a source contains a large amount of heat energy
B. two sources at the same temperature
C. two sources at the different temperatures
D. a source contains a small amount of energy
6 The efficiency of carnot engine cannot be 100% or one unless cold reservoir is at
A. 100 K
B. 273 K
C. 0 K
D. -273 K
7 The efficiency of diesel engine is
A. 25%
B. 25 - 30%
C. 35%
D. 35 - 40%
8 The absolute temperature of the tripple point of water is
A. 100°C
B. 4°C
C. 373 K
D. 273.16 K
9 If N is the total number of molecules and V is the volume of the container, then the expression for the pressure of gas is
A. P=P/V<1/2mv2>
B. P=2N/V<1/2mv2>
C. P=2/3N/V<1/2mv2>
D. P=2/3N/V<mv2>
10 Rate of diffusion is
A. Faster in solids than in liquids and gases
B. Faster in liquids than in solids and gases
C. Equal to solids, liquids and gases
D. Faster in gases than in liquids and solids

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