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

Electromagnetic waves emitted by hot bodies are called:

Question # 2

The ideal gas law is

Question # 3

In the formula P = N0KT, N0denotes:

Question # 4

At constant volume temperature is increased. Then

Question # 5

The example of irreversible process is

Question # 6

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

Question # 7

In a heat engine, heat is supplied by the

Question # 8

Sadi carnot described an ideal heat engine in

Question # 9

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

Question # 10

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

Question # 11

Absolute zero is considered as that temperature at which:

Question # 12

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

Question # 13

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

Question # 14

If the formula PV = nRT, n denotes:

Question # 15

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

Question # 16

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

Question # 17

Pressure may be define as _______ per second per unit area:

Question # 18

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

Question # 19

Pressure applied at any point of gas at rest is transmitted equally to all parts of the gas. This is the statement of:

Question # 20

If an amount of heat enters the system it could

Question # 21

The volume of a gas will be double of what it is at 0°C (pressure remaining constant) at

Question # 22

The volume of universal gas constant R is:

Question # 23

When heat is removed from the system

Question # 24

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

Question # 25

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

Question # 26

In an adiabatic expansion, the temperature of the gas

Question # 27

Which quantity is important in stating the entropy of the system

Question # 28

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

Question # 29

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

Question # 30

Rate of diffusion is

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 At constant temperature, if the density of the gas is increased, its pressure will:
A. One kg of a substance
B. Unit volume of a substance
C. One mole of a substance
D. None of these
2 If the volume of the gas is to be increased by 4 times, then
A. Temperature and pressure must be doubled
B. At constant P the temperature must be increased by 4 times
C. At constant T the pressure must be increased by four times
D. It cannot be increased
3 While deriving equation of pressure by kinetic theory of gases, we take into account:
A. Only linear motion of molecules
B. Only rotational motion
C. Only vibratory motion
D. All of these
4 Hotness and coldness of an object is represented in terms:
A. Heat
B. Temperature
C. Chemical energy
D. None of these
5 When two objects are rubbed together, their internal energy
A. remains same
B. decreases
C. remains the same then decreases
D. increases
6 The Boltzman constant has the value
A. 1.38 x 10-23JK-1
B. 1.28 x 10-23JK-1
C. 1.38 x 10-26JK-1
D. 1.28 x 10-26JK-1
7 Which of the following is not thermo dynamical function?
A. Enthalpy
B. Work done
C. Gibb's energy
D. Internal energy
8 In a heat engine, heat is supplied by the
A. cold reservoir
B. sink
C. hot reservoir
D. none of them
9 Triple point of water is
A. 273.16°F
B. 372.16K
C. 273.16°F
D. 273.16
10 Hydrogen and helium of same volume V at same temperature T and same pressure P are mixed to have same volume V. The resulting pressure of the mixtures will be
A. R/2
B. P
C. 2P
D. Depending on the relative mass of the gases

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