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 pressure of gas everywhere inside the vessel will be the same provided the gas is of

Question # 2

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

Question # 3

R.M.S velocity of a particle is V at pressure P. If pressure increases by two times, then R.M.S velocity becomes

Question # 4

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

Question # 5

The efficiency of diesel engine is

Question # 6

The volume of universal gas constant R is:

Question # 7

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

Question # 8

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

Question # 9

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 # 10

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

Question # 11

The example of reversible process is

Question # 12

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

Question # 13

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

Question # 14

At constant volume temperature is increased. Then

Question # 15

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 # 16

Adiabatic change occurs when the gas

Question # 17

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

Question # 18

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

Question # 19

Internal energy is the sum of all the forms of

Question # 20

Brownian motion increases due to

Question # 21

A process in which no heat enters or leaves the system is called

Question # 22

Electromagnetic waves emitted by hot bodies are called:

Question # 23

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

Question # 24

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

Question # 25

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

Question # 26

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

Question # 27

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

Question # 28

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

Question # 29

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

Question # 30

The value of E0in coulomb's law is:

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 A reversible cycle is the one in which
A. some of the changes are reversible
B. all of the changes are reversible
C. all of the changes are irreversible
D. none of them
2 In a heat engine, heat is supplied by the
A. cold reservoir
B. sink
C. hot reservoir
D. none of them
3 In an ideal gas, the molecules have:
A. Kinetic energy only
B. Potential energy only
C. Both KE and PE
D. None of these
4 At the constant temperature, if the value of a given mass of a gas is double, then the density of gas becomes:
A. Double
B. Remains constant
C. Half
D. None of these
5 Melting point of ice
A. Increases with increasing pressure
B. Decreases with increasing pressure
C. Is independent of pressure
D. Is proportional to pressure
6 Pressure applied at any point of gas at rest is transmitted equally to all parts of the gas. This is the statement of:
A. Newton's second law
B. Pascal's law
C. Carnot theorem
D. Second law of thermodynamics
7 The work done by the system on its environment is considered as
A. positive
B. negative
C. zero
D. any one of them
8 Efficiency of carnot engine is independent of the
A. temperature of sink
B. temperature of source
C. nature of the working substances
D. none of them
9 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
10 A typical four stroke petrol engine undergoes how many successive processes in each cycle
A. one
B. two
C. three
D. four

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