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

Melting point of ice

Question # 2

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

Question # 3

Generally a temperature scale is established by

Question # 4

Hotness and coldness of an object is represented in terms:

Question # 5

Efficiency of carnot engine is independent of the

Question # 6

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

Question # 7

An isochoric process is one which take place at

Question # 8

The volume of a gas will be double of what it is at 0°C (pressure remaining constant) at

Question # 9

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

Question # 10

Sadi carnot described an ideal heat engine in

Question # 11

In an ideal gas, the molecules have:

Question # 12

On colliding in a closed container, the gas molecules

Question # 13

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 # 14

Carnot heat engine only used

Question # 15

Heat travels through vacuum by

Question # 16

Two samples A and B of a gas initially of the same temperature and pressure are compressed from a volume V to a volume V/2 such that A is compressed isothermally and B adiabatically. The final pressure

Question # 17

Boyle's law is applicable in

Question # 18

The motion of molecules in gases is:

Question # 19

At constant volume temperature is increased. Then

Question # 20

Tick the correct pair when M denotes the molecular mass and other symbols carry usual meanings:

Question # 21

One mole of any substance contain

Question # 22

Absolute temperature can be calculated by

Question # 23

The ideal gas law is

Question # 24

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

Question # 25

The value of E0in coulomb's law is:

Question # 26

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

Question # 27

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

Question # 28

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

Question # 29

When heat is added into the system then change in entropy is

Question # 30

R.M.S velocity of a particle is V at pressure P. If pressure increases by two times, then R.M.S velocity becomes

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 A typical four stroke petrol engine undergoes how many successive processes in each cycle
A. one
B. two
C. three
D. four
2 Carnot heat engine only used
A. isothermal processes
B. adiabatic processes
C. both of them
D. none of them
3 Average KE of a gas molecule has:
A. Direct relation with absolute temperature and inverse relation with pressure
B. Direction relation with both absolute temperature and pressure
C. Inverse relation with both absolute temperature and pressure
D. None of these
4 In which process the condition for the application of Boyle's law on the gas is fulfilled
A. isochoric process
B. adiabatic process
C. isothermal process
D. none of them
5 The efficiency of diesel engine is
A. 25%
B. 25 - 30%
C. 35%
D. 35 - 40%
6 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
7 No spark plug is needed in
A. petrol engine
B. diesel engine
C. both of them
D. none of them
8 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
9 The percentage of available heat energy converted into work by a diesel engine is roughly
A. 35 %`
B. 40 %
C. 35 - 40 %
D. 25 %
10 The work done by the system on its environment is considered as
A. positive
B. negative
C. zero
D. any one of them

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