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

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

Question # 2

In an adiabatic process the work is done at the expense of the

Question # 3

A process which can be retraced in exactly reverse order, without producing any change in the surroundings is called

Question # 4

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

Question # 5

If a liquid is heated in weightlessness, the heat is transmitted through

Question # 6

Rice takes longest to cook

Question # 7

The pressure exerted by the gas is

Question # 8

If the formula PV = nRT, n denotes:

Question # 9

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

Question # 10

In thermodynamics, internal energy is the function of

Question # 11

The unit of thermodynamical scale is

Question # 12

The example of reversible process is

Question # 13

The efficiency of petrol engine is usually not more than 25% to 30% because of

Question # 14

Real gases strictly obey gas law at:

Question # 15

In a heat engine, heat is supplied by the

Question # 16

The curve representing an adiabatic process is called

Question # 17

Boyle's law is applicable in

Question # 18

A heat engine is that which converts

Question # 19

Internal energy is the sum of all the forms of

Question # 20

The rate of change of momentum of a molecule is equal to:

Question # 21

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

Question # 22

Carnot heat engine only used

Question # 23

Heat travels through vacuum by

Question # 24

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

Question # 25

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

Question # 26

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

Question # 27

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

Question # 28

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

Question # 29

The disorder in the system increases due to the

Question # 30

The earliest heat engine was

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 The example of reversible process is
A. an explosion
B. changes occur suddenly
C. slow compression of a gas
D. all of them
2 The unit of thermodynamical scale is
A. centigrade
B. fahrenheit
C. kelvin
D. none of them
3 Since the absolute scale is independent of the property of the working substance, hence, can be applied at
A. very high temperature
B. very low temperature
C. any one of them
D. none of them
4 Which quantity is important in stating the entropy of the system
A. initial entropy
B. final entropy
C. change in entropy
D. none of them
5 If 42 J heat is transferred to the system and the work done by the system is 32 J then what will be the change in internal energy
A. 0 J
B. 2 J
C. 5 J
D. 10 J
6 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
A. A greater than than of B
B. A is equal to that of B
C. A is less than that of B
D. A is twice the pressure of B
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 The kinetic energy of one molecule of a gas at normal temperature and pressure will be (k = 8.31 J/mole K) :
A. 1.7 x 103J
B. 10.2 x 103J
C. 3..4 x 103J
D. 6.8 x 103J
9 The nature of thermal radiation is similar to:
A. Ultraviolet rays
B. Light rays
C. Both of them
D. None of these
10 The example of irreversible process is
A. slowly liquification
B. slowly evaporation
C. an explosion
D. all of them

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