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

Amount of heat required to raise the temperature of a body through 1 K is called its

Question # 2

Which of the following is not an example of adiabatic process

Question # 3

A typical four stroke petrol engine undergoes how many successive processes in each cycle

Question # 4

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

Question # 5

Which of the following is a state variable

Question # 6

While deriving equation of pressure by kinetic theory of gases, we take into account:

Question # 7

At O° K which of the following properties of a gas will be zero?

Question # 8

In which process the condition for the application of Boyle's law on the gas is fulfilled

Question # 9

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

Question # 10

A real gas can be approximated to an ideal gas at

Question # 11

The volume of given mass of a gas will be doubled at atmosphere pressure if the temperature of the gas is changed from 150°C to

Question # 12

An isochoric process is one which take place at

Question # 13

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

Question # 14

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

Question # 15

Real gases strictly obey gas law at:

Question # 16

Which of the following does not have the same units:

Question # 17

Which of the following is not an assumption of kinetic energy

Question # 18

A reversible cycle is the one in which

Question # 19

The heat required to raise the temperature of one mole of the substance through 1 K is called

Question # 20

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

Question # 21

The unit of thermodynamical scale is

Question # 22

On the exaust stroke, the outlet values opens. The residual gases are expelled and piston moves

Question # 23

On the compression stroke of the petrol engine, the inlet value is closed and the mixture is compressed

Question # 24

Triple point of water is

Question # 25

First law of thermodynamics tells us that heat energy can be converted into equivalent amount of work, but it is silent about

Question # 26

The disorder in the system increases due to the

Question # 27

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

Question # 28

If an amount of heat enters the system it could

Question # 29

If the distance between two charges is doubled, the force between them will become:

Question # 30

For the working of a heat engine, there must be

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 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
2 R.M.S velocity of a particle is V at pressure P. If pressure increases by two times, then R.M.S velocity becomes
A. 2V
B. 3V
C. 0.5V
D. V
3 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
4 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 %
5 If a molecule with momentum mv strikes a wall and rebound then the change in momentum will be:
A. -2 mv
B. Zero
C. 2 mv
D. mv
6 At absolute temperature, the kinetic energy of the molecules
A. Becomes zero
B. Becomes maximum
C. Becomes minimum
D. Remain constant
7 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
8 A real gas can be approximated to an ideal gas at
A. Low density
B. High pressure
C. High density
D. Low temperature
9 The efficiency of petrol engine is usually not more than 25% to 30% because of
A. friction
B. heat losses
C. both of them
D. none of them
10 When two objects are rubbed together, their internal energy
A. remains same
B. decreases
C. remains the same then decreases
D. increases

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