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

While deriving the equation for pressure of a gas we consider the

Question # 2

For making cooking utensils, which of the following pairs of properties is most suited?

Question # 3

What temperature is the same on Celsius scale as well as on Fahrenheit scale?

Question # 4

Brownian motion increases due to

Question # 5

The bicycle pump provides a good example of

Question # 6

The ideal gas law is

Question # 7

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

Question # 8

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

Question # 9

Carnot heat engine only used

Question # 10

Gas constant per molecule is called:

Question # 11

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

Question # 12

Average KE of a gas molecule has:

Question # 13

First law of thermodynamic is special case of

Question # 14

During the whole carnot cycle

Question # 15

The kinetic energy of one molecule of a gas at normal temperature and pressure will be (k = 8.31 J/mole K) :

Question # 16

When the temperature of source and sink of a heat engine become equal entropy change will be

Question # 17

Maximum density of H2O is at the temperature

Question # 18

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

Question # 19

Generally a temperature scale is established by

Question # 20

First law of thermodynamics is consequence of conservation of

Question # 21

We cannot utilize the heat contents of oceans and atmosphere because

Question # 22

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

Question # 23

The basis to define a temperature scale that is independent of material properties is provided by

Question # 24

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

Question # 25

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

Question # 26

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

Question # 27

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 # 28

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

Question # 29

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

Question # 30

Adiabatic change occurs when the gas

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 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
2 While deriving the equation for pressure of a gas we consider the
A. rotational motion of molecules
B. vibrational motion of molecules
C. linear motion of molecules
D. all of them
3 Good absorbers of heat are
A. Poor emitters
B. Non emitters
C. Good emitters
D. Highly polarized
4 The example of reversible process is
A. an explosion
B. changes occur suddenly
C. slow compression of a gas
D. all of them
5 The earliest heat engine was
A. petrol engine
B. diesel engine
C. electric engine
D. steam engine
6 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
A. second law thermodynamics
B. first law of thermodynamics
C. third law of thermodynamics
D. none of them
7 A process is a reversible process, if the entropy of the system
A. increases
B. decreases
C. remains constant
D. none of them
8 Which of the following is a state variable
A. entropy
B. pressure
C. volume
D. all of them
9 The internal energy of an ideal gas system is generally the
A. translational K.E of molecules
B. vibrational K.E of molecules
C. rotational K.E of molecules
D. all of them
10 In thermodynamics, internal energy is the function of
A. temperature
B. pressure
C. state
D. none of them

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