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

Internal energy is the sum of all the forms of

Question # 2

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

Question # 3

Efficiency of carnot engine is independent of the

Question # 4

If a process cannot be retraced in the backward direction by reversing the controlling factors, it is

Question # 5

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

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

The pressure exerted by the gas is

Question # 10

Which quantity is important in stating the entropy of the system

Question # 11

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

Question # 12

The efficiency of diesel engine is

Question # 13

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

Question # 14

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

Question # 15

A diatomic gas molecule has

Question # 16

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

Question # 17

A reversible cycle is the one in which

Question # 18

The basis to define a temperature scale that is independent of material properties is provided by

Question # 19

Energy gas behaves like an ideal gast at

Question # 20

The state in which ice, water and vapour coexists in equilibrium is called

Question # 21

The temperature scale approved in SI units is:

Question # 22

At absolute temperature, the kinetic energy of the molecules

Question # 23

Rice takes longest to cook

Question # 24

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

Question # 25

One mole of any substance contain

Question # 26

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

Question # 27

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

Question # 28

If the ratio of densities of two gases is 1:4, then the ratio of their rates of diffusion into one another is

Question # 29

A carnot cycle consists of

Question # 30

The coefficient of linear expansion of iron is 0.000011 per°K. An iron rod is 10 metre long at 27°C. The length of the rod will be decreased by 1.1 mm when the temperature of the rod changes to

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 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
2 Absolute zero is considered as that temperature at which:
A. All liquid become gases
B. All gases become liquid
C. Water freezes
D. None of these
3 First law of thermodynamics tells us that heat energy can be converted into equivalent amount of work, but it is silent about
A. how heat is absorbed
B. how heat extracted
C. how this conversion takes place
D. none of them
4 The disorder in the system increases due to the
A. removal of heat
B. addition of heat
C. removal or addition of heat
D. none of them
5 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
6 A heat engine is that which converts
A. mechanical energy into thermal energy
B. thermal energy into mechanical energy
C. K.E into potential energy
D. heat energy into light energy
7 A process in which no heat enters or leaves the system is called
A. isochoric process
B. isothermal process
C. adiabatic process
D. none of them
8 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
9 The rate of change of momentum of a molecule is equal to:
A. Pressure
B. Work
C. Density
D. Force
10 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

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