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

Question # 2

If 42 J heat is transferred to the system and the work done by the system is 32 J then what will be the change in internal energy

Question # 3

Pressure exerted by a gas is

Question # 4

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

Question # 5

If a liquid is heated in weightlessness, the heat is transmitted through

Question # 6

Internal energy is the sum of all the forms of

Question # 7

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

Question # 8

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 # 9

The bicycle pump provides a good example of

Question # 10

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

Question # 11

The number of translation degress of freedom for a diatomic gas is

Question # 12

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

Question # 13

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

Question # 14

Gas constant per molecule is called:

Question # 15

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 # 16

At constant volume temperature is increased. Then

Question # 17

The absolute temperature of the tripple point of water is

Question # 18

At absolute temperature, the kinetic energy of the molecules

Question # 19

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

Question # 20

A diatomic gas molecule has

Question # 21

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

Question # 22

An irreversible heat flow from a hot to cold substances of a system, causes the disorder to

Question # 23

We cannot utilize the heat contents of oceans and atmosphere because

Question # 24

The example of reversible process is

Question # 25

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

Question # 26

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

Question # 27

The value of E0in coulomb's law is:

Question # 28

The absolute temperature for an ideal gas is

Question # 29

Pressure of a gas at constant volume is proportion to

Question # 30

Real gases strictly obey gas law at:

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 On colliding in a closed container, the gas molecules
A. Transfer momentum to the walls
B. Momentum becomes zero
C. Move in opposite directions
D. Perform Brownian motion
2 Melting point of ice
A. Increases with increasing pressure
B. Decreases with increasing pressure
C. Is independent of pressure
D. Is proportional to pressure
3 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
4 If water in a closed bottle is taken up to the moon and opened, the water gets
A. Freeze
B. Boiled
C. Dissociated into O2and H2
D. Evaporated
5 Pressure may be define as _______ per second per unit area:
A. Change in force
B. Change in momentum
C. Change in energy
D. Work done
6 Hotness and coldness of an object is represented in terms:
A. Heat
B. Temperature
C. Chemical energy
D. None of these
7 No spark plug is needed in
A. petrol engine
B. diesel engine
C. both of them
D. none of them
8 The efficiency of diesel engine is
A. 25%
B. 25 - 30%
C. 35%
D. 35 - 40%
9 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
10 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
A. 0°C
B. 10°C
C. 17°C
D. 20°C

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