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

Carnot heat engine only used

Question # 2

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

Question # 3

The ideal gas law is

Question # 4

Generally a temperature scale is established by

Question # 5

On a cold morning a metal surface will fell colder to touch than a wooden surface, because

Question # 6

No spark plug is needed in

Question # 7

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

Question # 8

An isochoric process is one which take place at

Question # 9

The disorder in the system increases due to the

Question # 10

Good absorbers of heat are

Question # 11

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

Question # 12

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

Question # 13

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 # 14

During the whole carnot cycle

Question # 15

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

Question # 16

The temperature scale approved in SI units is:

Question # 17

A heat engine is that which converts

Question # 18

First law of thermodynamics is consequence of conservation of

Question # 19

We can express the work in term of

Question # 20

The product of the pressure and volume of an ideal gas is

Question # 21

A process is a reversible process, if the entropy of the system

Question # 22

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

Question # 23

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

Question # 24

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

Question # 25

Maximum density of H2O is at the temperature

Question # 26

Which of the following does not have the same units:

Question # 27

Since the absolute scale is independent of the property of the working substance, hence, can be applied at

Question # 28

Real gases strictly obey gas law at:

Question # 29

Internal energy is the sum of all the forms of

Question # 30

Average KE of a gas molecule has:

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 In case of an ideal gas, the P.E associated with its molecule is
A. maximum
B. zero
C. minimum
D. not fixed
2 The Boltzman constant has the value
A. 1.38 x 10-23JK-1
B. 1.28 x 10-23JK-1
C. 1.38 x 10-26JK-1
D. 1.28 x 10-26JK-1
3 The percentage of available heat energy converted into work by a diesel engine is roughly
A. 35 %`
B. 40 %
C. 35 - 40 %
D. 25 %
4 Pressure applied at any point of gas at rest is transmitted equally to all parts of the gas. This is the statement of:
A. Newton's second law
B. Pascal's law
C. Carnot theorem
D. Second law of thermodynamics
5 A reversible cycle is the one in which
A. some of the changes are reversible
B. all of the changes are reversible
C. all of the changes are irreversible
D. none of them
6 Boyle's law is applicable in
A. Isochoric process
B. Isothermal process
C. Isobaric process
D. Isotonic process
7 The temperature of gas is produced by
A. At potential energy of its molecules
B. The kinetic energy of its molecules
C. The attractive force between its molecules
D. The repulsive force between its molecules
8 Adiabatic change occurs when the gas
A. expands
B. compressed
C. expands or compressed
D. expands or compressed rapidly
9 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
10 Two metal rods A and B have their initial lengths in the ratio 2 : 3 and coefficients of linear expansion in the ratio 4 : 3. When they are heated through same temperature difference the ratio of their linear expansion is
A. 1 : 2
B. 2 : 3
C. 3 : 4
D. 8 : 9

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