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

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

Question # 3

The earliest heat engine was

Question # 4

Which of the following is not thermo dynamical function?

Question # 5

Which of the following is not an example of adiabatic process

Question # 6

Specific heat at constant pressure is greater than the specific heat at constant volume because

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

The example of irreversible process is

Question # 11

When the temperature of source and sink of a heat engine become equal entropy change will be

Question # 12

If the distance between two charges is doubled, the force between them will become:

Question # 13

First law of thermodynamics tells us that heat energy can be converted into equivalent amount of work, but it is silent about

Question # 14

Boyle's law is applicable in

Question # 15

Efficiency of carnot engine is independent of the

Question # 16

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

Question # 17

At what temperature the adiabatic change is equivalent to the isothermal change?

Question # 18

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

Question # 19

The motion of molecules in gases is:

Question # 20

Average KE of a gas molecule has:

Question # 21

A gas is compressed adiabatically till its temperature is double. The ratio of its final volume to initial volume will be

Question # 22

Pressure exerted by a gas is

Question # 23

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

Question # 24

The volume of a gas will be double of what it is at 0°C (pressure remaining constant) at

Question # 25

The efficiency of diesel engine is

Question # 26

Heat travels through vacuum by

Question # 27

Rice takes longest to cook

Question # 28

Real gases strictly obey gas law at:

Question # 29

At constant temperature, if the density of the gas is increased, its pressure will:

Question # 30

At O° K which of the following properties of a gas will be zero?

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 Sadi carnot described an ideal heat engine in
A. 1820
B. 1840
C. 1860
D. 1880
2 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
3 If an amount of heat enters the system it could
A. decrease the internal energy
B. not change the internal energy
C. increase the internal energy
D. none of them
4 Specific heat at constant pressure is greater than the specific heat at constant volume because
A. Heat is used up to increase temperature at constant pressure
B. Heat is used by gas for expansions purposes at constant pressure
C. Heat is use dup to increase internal energy
D. The above statement is invalid
5 While deriving equation of pressure by kinetic theory of gases, we take into account:
A. Only linear motion of molecules
B. Only rotational motion
C. Only vibratory motion
D. All of these
6 On a cold morning a metal surface will fell colder to touch than a wooden surface, because
A. Metal has high specific heat
B. Metal has high thermal conductivity
C. Metal has low specific heat
D. Metal has low thermal conductivity
7 The behaviour of gases is well accounted by the kinetic theory based on
A. microscopic approach
B. macroscopic approach
C. both of them
D. none of them
8 R.M.S velocity of a particle is V at pressure P. If pressure increases by two times, then R.M.S velocity becomes
A. 2V
B. 3V
C. 0.5V
D. V
9 Truth of kinetic energy is confirmed by:
A. Diffusion of gases
B. Brownian motion
C. Both A and B
D. None of these
10 The ideal gas law is
A. P = nRT
B. V = nRT
C. PV =RT
D. PV =nRT

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