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

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

Question # 2

If water in a closed bottle is taken up to the moon and opened, the water gets

Question # 3

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

Question # 4

Good absorbers of heat are

Question # 5

In thermodynamics, internal energy is the function of

Question # 6

Pressure exerted by a gas is

Question # 7

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

Question # 8

Adiabatic change occurs when the gas

Question # 9

Triple point of water is

Question # 10

A heat engine is that which converts

Question # 11

At O° K which of the following properties of a gas will be zero?

Question # 12

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

Question # 13

The process which is carried out at constant temperature is known as

Question # 14

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

Question # 15

On the exaust stroke, the outlet values opens. The residual gases are expelled and piston moves

Question # 16

While deriving the equation for pressure of a gas we consider the

Question # 17

On the compression stroke of the petrol engine, the inlet value is closed and the mixture is compressed

Question # 18

Which of the following is not an example of adiabatic process

Question # 19

The internal energy of a system does not depend upon the

Question # 20

The example of irreversible process is

Question # 21

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

Question # 22

The relationship between Boltzmann constant k with R and NAis given as:

Question # 23

The heat required to raise the temperature of one mole of the gas through 1 K at constant volume is called

Question # 24

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

Question # 25

Maximum density of H2O is at the temperature

Question # 26

The internal energy of an ideal gas system is generally the

Question # 27

One mole of any substance contain

Question # 28

Two metal rods A and B have their initial lengths in the ratio 2 : 3 and coefficients of linear expansion in the ratio 4 : 3. When they are heated through same temperature difference the ratio of their linear expansion is

Question # 29

If the distance between two charges is doubled, the force between them will become:

Question # 30

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

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 If 42 J heat is transferred to the system and the work done by the system is 32 J then what will be the change in internal energy
A. 0 J
B. 2 J
C. 5 J
D. 10 J
2 Electromagnetic waves emitted by hot bodies are called:
A. Photoelectrons
B. Alpha rays
C. Thermal radiation
D. None of these
3 In the study of thermodynamics, which gas is considered as the working substance
A. real gas
B. ideal gas
C. any gas may be ideal or real
D. none of them
4 A typical four stroke petrol engine undergoes how many successive processes in each cycle
A. one
B. two
C. three
D. four
5 Pressure may be define as _______ per second per unit area:
A. Change in force
B. Change in momentum
C. Change in energy
D. Work done
6 First law of thermodynamic is special case of
A. Law of conservation of energy
B. Charle's law
C. Law of conservation of mass
D. Boyle's law
7 Boyle's law is applicable in
A. Isochoric process
B. Isothermal process
C. Isobaric process
D. Isotonic process
8 At constant temperature, on increasing the pressure of a gas by 5%, its volume. The final temperature of the gas will be
A. 81 K
B. 355 K
C. 627 K
D. 627°C
9 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
10 Hotness and coldness of an object is represented in terms:
A. Heat
B. Temperature
C. Chemical energy
D. None of these

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