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

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

Question # 2

In the reverse process, the working substance passes through the same stages as in the direct process and

Question # 3

Electromagnetic waves emitted by hot bodies are called:

Question # 4

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 # 5

In which process the condition for the application of Boyle's law on the gas is fulfilled

Question # 6

At the constant temperature, if the value of a given mass of a gas is double, then the density of gas becomes:

Question # 7

The motion of molecules in gases is:

Question # 8

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 # 9

The behaviour of gases is well accounted by the kinetic theory based on

Question # 10

Boyle's law is applicable in

Question # 11

Absolute temperature can be calculated by

Question # 12

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

Question # 13

The pressure exerted by the gas is

Question # 14

If R is gas constant for 1 gram mole, Cpand Cvare specific heat for a solid then

Question # 15

Which of the following is not an assumption of kinetic energy

Question # 16

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

Question # 17

A gas which strictly obeys the gas laws under all conditions of temperature and pressure is called:

Question # 18

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

Question # 19

Generally a temperature scale is established by using certain physical properties of a material which varies

Question # 20

Average KE of a gas molecule has:

Question # 21

Generally a temperature scale is established by

Question # 22

The concept of entropy was introduced into the study of thermodynamics in

Question # 23

Real gases strictly obey gas law at:

Question # 24

Which quantity is important in stating the entropy of the system

Question # 25

In a heat engine, heat is supplied by the

Question # 26

Which of the following is a state variable

Question # 27

10 c.c. each of oxygen and hydrogen are kept in separate flasks. Then which of the following relations is correct?

Question # 28

In the theory of dimensional analysis, heat may be properly represented by:

Question # 29

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

Question # 30

Efficiency of carnot engine is independent of the

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 In an adiabatic expansion, the temperature of the gas
A. increases
B. becomes zero
C. decreases
D. decreases rapidly
2 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
3 The work done on the system by the environment is considered as
A. positive
B. negative
C. zero
D. any one of them
4 The length of a metallic rod is 5 meter at 100°C. The coefficient of cubical expansion of the metal will be
A. 2.0 x 10-5/°C
B. 4.0x10-5/°C
C. 6.0x10-5/°C
D. 2.33x10-5/°C
5 At absolute temperature, the kinetic energy of the molecules
A. Becomes zero
B. Becomes maximum
C. Becomes minimum
D. Remain constant
6 The work done by the system on its environment is considered as
A. positive
B. negative
C. zero
D. any one of them
7 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
8 When the temperature of source and sink of a heat engine become equal entropy change will be
A. Zero
B. Max
C. Min
D. -ve
9 Carnot heat engine only used
A. isothermal processes
B. adiabatic processes
C. both of them
D. none of them
10 Maximum density of H2O is at the temperature
A. 32°F
B. 39.2°F
C. 42°F
D. 4°F

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