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

At absolute temperature, the kinetic energy of the molecules

Question # 2

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

Question # 3

Rate of diffusion is

Question # 4

A diatomic gas molecule has

Question # 5

The internal energy of a system does not depend upon the

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

The work done by the system on its environment is considered as

Question # 10

Triple point of water is

Question # 11

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

Question # 12

On a cold morning a metal surface will fell colder to touch than a wooden surface, because

Question # 13

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

Question # 14

The coefficient of linear expansion of iron is 0.000011 per°K. An iron rod is 10 metre long at 27°C. The length of the rod will be decreased by 1.1 mm when the temperature of the rod changes to

Question # 15

The unit of thermodynamical scale is

Question # 16

Pressure of a gas at constant volume is proportion to

Question # 17

The state in which ice, water and vapour coexists in equilibrium is called

Question # 18

Melting point of ice

Question # 19

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

Question # 20

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

Question # 21

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

Question # 22

Generally a temperature scale is established by

Question # 23

Carnot heat engine only used

Question # 24

Generally a temperature scale is established by using certain physical properties of a material which varies

Question # 25

The length of a metallic rod is 5 meter at 100°C. The coefficient of cubical expansion of the metal will be

Question # 26

If a process cannot be retraced in the backward direction by reversing the controlling factors, it is

Question # 27

For the working of a heat engine, there must be

Question # 28

If the formula PV = nRT, n denotes:

Question # 29

Which of the following is not an example of adiabatic process

Question # 30

In an ideal gas, the molecules have:

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 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
A. 1 : 2
B. 2 : 3
C. 3 : 4
D. 8 : 9
2 We cannot utilize the heat contents of oceans and atmosphere because
A. there is no reservoir at the same temperature
B. there is no reservoir at the temperature lower than any one of two
C. there is no reservoir at the temperature higher than any one of two
D. none of them
3 The kinetic energy of one molecule of a gas at normal temperature and pressure will be (k = 8.31 J/mole K) :
A. 1.7 x 103J
B. 10.2 x 103J
C. 3..4 x 103J
D. 6.8 x 103J
4 In all natural processes where heat flows from one system to another, there is always a net
A. decrease in entropy
B. increase in entropy
C. decrease or increase in entropy
D. none of them
5 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
6 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
7 No spark plug is needed in
A. petrol engine
B. diesel engine
C. both of them
D. none of them
8 The relationship between Boltzmann constant k with R and NAis given as:
A. k = RNA
B. k =R/NA
C. k = NR/NA
D. None of these
9 Melting point of ice
A. Increases with increasing pressure
B. Decreases with increasing pressure
C. Is independent of pressure
D. Is proportional to pressure
10 On the compression stroke of the petrol engine, the inlet value is closed and the mixture is compressed
A. adiabatically
B. isothermally
C. isochorcally
D. isobarically

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