ECAT Pre General Science Chapter 11 online mcq test with answers for Physics chapter 11 (Heart & Thermodynamics)

Question # 1

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

32°C A
-32°C B
-40°C C
-212°C D

Question # 2

No spark plug is needed in

petrol engine A
diesel engine B
both of them C
none of them D

Question # 3

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

Conduction A
Convection B
Radiation C
Neither, because the liquid cannot be heated in weightlessness D

Question # 4

Maximum density of H₂O is at the temperature

32°F A
39.2°F B
42°F C
4°F D

Question # 5

Heat required to raise the temperature of one mole of a gas through 1 K at constant pressure is called

heat capacity A
specific heat capacity B
specific heat at constant volume C
specific heat at constant pressure D

Question # 6

Pressure of a gas at constant volume is proportion to

Total energy of gas A
Average P.E to molecules B
Average K.E of molecules C
Total internal energy of gas D

Question # 7

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

-2 mv A
Zero B
2 mv C
mv D

Question # 8

The work done by the system on its environment is considered as

positive A
negative B
zero C
any one of them D

Question # 9

Average KE of a gas molecule has:

Direct relation with absolute temperature and inverse relation with pressure A
Direction relation with both absolute temperature and pressure B
Inverse relation with both absolute temperature and pressure C
None of these D

Question # 10

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

100 K A
273 K B
0 K C
-273 K D

Question # 11

Good absorbers of heat are

Poor emitters A
Non emitters B
Good emitters C
Highly polarized D

Question # 12

Which of the following is a state variable

entropy A
pressure B
volume C
all of them D

Question # 13

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

ML²T^-2 A
MT^-2 B
ML^-1T^-1 C
None of these D

Question # 14

The highest efficiency of a heat engine whose low temperature is 17°C and the high temperature is 200°C is

70% A
100% B
35% C
38% D

Question # 15

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 greater than than of B A
A is equal to that of B B
A is less than that of B C
A is twice the pressure of B D

Question # 16

Real gases strictly obey gas law at:

High pressure and low temperatures A
Low pressures and high temperatures B
High pressures and high temperatures C
None of these D

Question # 17

Absolute zero is considered as that temperature at which:

All liquid become gases A
All gases become liquid B
Water freezes C
None of these D

Question # 18

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

35 %` A
40 % B
35 - 40 % C
25 % D

Question # 19

A heat engine is that which converts

mechanical energy into thermal energy A
thermal energy into mechanical energy B
K.E into potential energy C
heat energy into light energy D

Question # 20

In an ideal gas, the molecules have:

Kinetic energy only A
Potential energy only B
Both KE and PE C
None of these D

Question # 21

Amount of heat required to raise the temperature of a body through 1 K is called its

Specific heat A
Water equivalent B
Thermal capacity C
Entropy D

Question # 22

The only significant motion possessed by the mono-atomic gas represented is:

Translatory A
Rotatory B
Vibratory C
None of these D

Question # 23

Rate of diffusion is

Faster in solids than in liquids and gases A
Faster in liquids than in solids and gases B
Equal to solids, liquids and gases C
Faster in gases than in liquids and solids D

Question # 24

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

adiabatic process A
isothermal process B
isochoric process C
none of them D

Question # 25

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

decrease A
remains the same B
increase C
any one of them D

Question # 26

Hotness and coldness of an object is represented in terms:

Heat A
Temperature B
Chemical energy C
None of these D

Question # 27

We cannot utilize the heat contents of oceans and atmosphere because

there is no reservoir at the same temperature A
there is no reservoir at the temperature lower than any one of two B
there is no reservoir at the temperature higher than any one of two C
none of them D

Question # 28

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

a source contains a large amount of heat energy A
two sources at the same temperature B
two sources at the different temperatures C
a source contains a small amount of energy D

Question # 29

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

second law thermodynamics A
first law of thermodynamics B
third law of thermodynamics C
none of them D

Question # 30

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

A constant A
Approximately equal to the universal gas constant B
Directly proportional to its temperature C
Inversely proportional to its temperature D

Sr.#	Question	Answer
1	Carnot heat engine only used	A. isothermal processes B. adiabatic processes C. both of them D. none of them
2	The volume of universal gas constant R is:	A. 8.314 J/K mole K B. 8314 J/K mole K C. 8.314 J/mole K D. None of these
3	What temperature is the same on Celsius scale as well as on Fahrenheit scale?	A. 32°C B. -32°C C. -40°C D. -212°C
4	In a heat engine, heat is supplied by the	A. cold reservoir B. sink C. hot reservoir D. none of them
5	The rate of change of momentum of a molecule is equal to:	A. Pressure B. Work C. Density D. Force
6	If a molecule with momentum mv strikes a wall and rebound then the change in momentum will be:	A. -2 mv B. Zero C. 2 mv D. mv
7	According to the second law, which is must to produce work	A. a source contains a large amount of heat energy B. two sources at the same temperature C. two sources at the different temperatures D. a source contains a small amount of energy
8	Melting point of ice	A. Increases with increasing pressure B. Decreases with increasing pressure C. Is independent of pressure D. Is proportional to pressure
9	The pressure exerted by the gas is	A. directly proportional to the P.E B. inversely proportional to the P.E C. inversely proportional to the K.E D. directly proportional to the K.E
10	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

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ECAT Pre General Science Physics Chapter 11 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 11 Heat & Thermodynamics

ECAT Pre General Science Physics Chapter 11 Heat & Thermodynamics

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

No spark plug is needed in

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

Maximum density of H2O is at the temperature

Heat required to raise the temperature of one mole of a gas through 1 K at constant pressure is called

Pressure of a gas at constant volume is proportion to

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

The work done by the system on its environment is considered as

Average KE of a gas molecule has:

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

Good absorbers of heat are

Which of the following is a state variable

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

The highest efficiency of a heat engine whose low temperature is 17°C and the high temperature is 200°C is

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

Real gases strictly obey gas law at:

Absolute zero is considered as that temperature at which:

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

A heat engine is that which converts

In an ideal gas, the molecules have:

Amount of heat required to raise the temperature of a body through 1 K is called its

The only significant motion possessed by the mono-atomic gas represented is:

Rate of diffusion is

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

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

Hotness and coldness of an object is represented in terms:

We cannot utilize the heat contents of oceans and atmosphere because

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

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

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

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Maximum density of H₂O is at the temperature