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

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

Question # 2

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 # 3

Real gases strictly obey gas law at:

Question # 4

Generally a temperature scale is established by

Question # 5

Efficiency of carnot engine is independent of the

Question # 6

The pressure exerted by the gas is

Question # 7

According to the second law, which is must to produce work

Question # 8

We cannot utilize the heat contents of oceans and atmosphere because

Question # 9

Rate of diffusion is

Question # 10

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

Question # 11

The process which is carried out at constant temperature is known as

Question # 12

Which of the following is not thermo dynamical function?

Question # 13

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

Question # 14

In the formula P = N0KT, N0denotes:

Question # 15

The temperature of gas is produced by

Question # 16

At absolute temperature, the kinetic energy of the molecules

Question # 17

The efficiency of diesel engine is

Question # 18

In thermodynamics, internal energy is the function of

Question # 19

What temperature is the same on Celsius scale as well as on Fahrenheit scale?

Question # 20

Which of the following is a state variable

Question # 21

Hotness and coldness of an object is represented in terms:

Question # 22

A real gas can be approximated to an ideal gas at

Question # 23

The motion of molecules in gases is:

Question # 24

One mole of any substance contain

Question # 25

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 # 26

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

Question # 27

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

Question # 28

First law of thermodynamic is special case of

Question # 29

Absolute zero is considered as that temperature at which:

Question # 30

We can express the work in term of

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 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
2 First law of thermodynamics is consequence of conservation of
A. Work
B. Energy
C. Heat
D. All of these
3 The efficiency of carnot engine cannot be 100% or one unless cold reservoir is at
A. 100 K
B. 273 K
C. 0 K
D. -273 K
4 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
5 No spark plug is needed in
A. petrol engine
B. diesel engine
C. both of them
D. none of them
6 The temperature scale approved in SI units is:
A. Celsius scale
B. Kelvin scale
C. Fehrenheit scale
D. None of these
7 The motion of molecules in gases is:
A. Orderly
B. Random
C. Circular
D. All of these
8 For the working of a heat engine, there must be
A. a source of heat at high temperature
B. a sink at low temperature
C. both of them
D. none of them
9 The earliest heat engine was
A. petrol engine
B. diesel engine
C. electric engine
D. steam engine
10 The nature of thermal radiation is similar to:
A. Ultraviolet rays
B. Light rays
C. Both of them
D. None of these

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