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

During the whole carnot cycle

Question # 2

If the volume of the gas is to be increased by 4 times, then

Question # 3

In which process the condition for the application of Boyle's law on the gas is fulfilled

Question # 4

The absolute temperature of the tripple point of water is

Question # 5

Rate of diffusion is

Question # 6

Pressure exerted by a gas is

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

The disorder in the system increases due to the

Question # 12

According to kinetic theory of gases, molecules of a gas behave like

Question # 13

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

Question # 14

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

Question # 15

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

Question # 16

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

Question # 17

A gas is compressed adiabatically till its temperature is double. The ratio of its final volume to initial volume will be

Question # 18

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

Question # 19

The curve representing an isothermal process is called

Question # 20

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

Question # 21

Which of the following is a state variable

Question # 22

At the constant temperature, if the value of a given mass of a gas is double, then the density of gas becomes:

Question # 23

The basis to define a temperature scale that is independent of material properties is provided by

Question # 24

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

Question # 25

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

Question # 26

In thermodynamics, internal energy is the function of

Question # 27

The Boltzman constant has the value

Question # 28

If the ratio of densities of two gases is 1:4, then the ratio of their rates of diffusion into one another is

Question # 29

Absolute zero is considered as that temperature at which:

Question # 30

At constant temperature, on increasing the pressure of a gas by 5%, its volume. The final temperature of the gas will be

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 For the working of a heat engine, there must be
A. a source of heat at high temperature
B. a sink at low temperature
C. both of them
D. none of them
2 The efficiency of petrol engine is usually not more than 25% to 30% because of
A. friction
B. heat losses
C. both of them
D. none of them
3 Since the absolute scale is independent of the property of the working substance, hence, can be applied at
A. very high temperature
B. very low temperature
C. any one of them
D. none of them
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 The pressure exerted by the gas is
A. directly proportional to the P.E
B. inversely proportional to the P.E
C. inversely proportional to the K.E
D. directly proportional to the K.E
6 Which of the following is not an assumption of kinetic energy
A. a finite volume of gas consists of very large number of molecules
B. the gas molecules are in random motion
C. collision between the gas molecules are inelastic
D. the size of the gas molecules is much smaller than the separation between molecules
7 We can express the work in term of
A. directly measurable variables
B. indirectly measurable variables
C. either of them
D. both of them
8 Brownian motion increases due to
A. Increase in size of Brownian particle
B. Increase in temperature of medium
C. Increase in density of medium
D. Increase in viscosity of medium
9 In the reverse process, the working substance passes through the same stages as in the direct process and
A. thermal effects at each stage are exactly reversed
B. mechanical effects at each stage are exactly reversed
C. thermal and mechanical effects at each stage remain the same
D. thermal and mechanical effects at each stage are exactly reversed
10 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

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