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

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

Question # 2

We can express the work in term of

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

Rice takes longest to cook

Question # 7

First law of thermodynamic is special case of

Question # 8

If the formula PV = nRT, n denotes:

Question # 9

The disorder in the system increases due to the

Question # 10

Energy gas behaves like an ideal gast at

Question # 11

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

Question # 12

The motion of molecules in gases is:

Question # 13

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

Question # 14

When heat is removed from the system

Question # 15

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

Question # 16

Boyle's law is applicable in

Question # 17

A succession of events which bring the system back to its initial condition is called

Question # 18

On colliding in a closed container, the gas molecules

Question # 19

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

Question # 20

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

Question # 21

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

Question # 22

The only significant motion possessed by the mono-atomic gas represented is:

Question # 23

A gas which strictly obeys the gas laws under all conditions of temperature and pressure is called:

Question # 24

The nature of thermal radiation is similar to:

Question # 25

The internal energy of an ideal gas system is generally the

Question # 26

A reversible cycle is the one in which

Question # 27

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

Question # 28

The efficiency of carnot engine cannot be 100% or one unless cold reservoir is at

Question # 29

Triple point of water is

Question # 30

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

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 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
2 Rice takes longest to cook
A. In a submarine 100 m below the surface of the sea
B. At sea level
C. At Murree
D. At Mount Everest
3 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
4 The percentage of available heat energy converted into work by a diesel engine is roughly
A. 35 %`
B. 40 %
C. 35 - 40 %
D. 25 %
5 The number of translation degress of freedom for a diatomic gas is
A. 2
B. 3
C. 5
D. 6
6 When heat is removed from the system
A. negative
B. positive
C. zero
D. any one of them
7 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
8 When two objects come to common temperature, the body is said to be in:
A. Static equilibrium
B. Dynamic equilibrium
C. Thermal equilibrium
D. None of these
9 The percentage of available heat energy converted into work by a petrol engine is roughly
A. 35 %
B. 40 %
C. 35 to 40 %
D. 25 %
10 Carnot heat engine only used
A. isothermal processes
B. adiabatic processes
C. both of them
D. none of them

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