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 example of irreversible process is

Question # 2

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

Question # 3

Which of the following is not an example of adiabatic process

Question # 4

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

Question # 5

Pressure may be define as _______ per second per unit area:

Question # 6

The temperature scale approved in SI units is:

Question # 7

At constant temperature, if the density of the gas is increased, its pressure will:

Question # 8

An amount of water of mass 20 g at 0°C is mixed with 40 g of water at 10°C. Final temperature of mixture is

Question # 9

Sadi carnot described an ideal heat engine in

Question # 10

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

Question # 11

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

Question # 12

Gas constant per molecule is called:

Question # 13

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

Question # 14

The motion of molecules in gases is:

Question # 15

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

Question # 16

When two objects are rubbed together, their internal energy

Question # 17

The earliest heat engine was

Question # 18

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

Question # 19

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

Question # 20

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

Question # 21

The value of E0in coulomb's law is:

Question # 22

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

Question # 23

At absolute temperature, the kinetic energy of the molecules

Question # 24

Pressure applied at any point of gas at rest is transmitted equally to all parts of the gas. This is the statement of:

Question # 25

Which of the following does not have the same units:

Question # 26

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

Question # 27

The curve representing an adiabatic process is called

Question # 28

In all natural processes where heat flows from one system to another, there is always a net

Question # 29

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

Question # 30

The volume of universal gas constant R is:

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ECAT Class Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 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
2 10 c.c. each of oxygen and hydrogen are kept in separate flasks. Then which of the following relations is correct?
A. Each have same number of molecules
B. Don't have same number of molecules
C. Can't be predicted
D. None
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 When two objects are rubbed together, their internal energy
A. remains same
B. decreases
C. remains the same then decreases
D. increases
5 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
6 The second law of thermodynamics is concerned with the circumstances in which
A. heat can be converted into work
B. direction of flow of heat
C. none of them
D. both of them
7 At what temperature the adiabatic change is equivalent to the isothermal change?
A. Zero degree Celsius
B. Zero Kelvin
C. Critical temperature
D. Above critical temperature
8 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
9 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
10 Specific heat at constant pressure is greater than the specific heat at constant volume because
A. Heat is used up to increase temperature at constant pressure
B. Heat is used by gas for expansions purposes at constant pressure
C. Heat is use dup to increase internal energy
D. The above statement is invalid

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