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

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

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

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

Question # 4

A process is a reversible process, if the entropy of the system

Question # 5

Which quantity is important in stating the entropy of the system

Question # 6

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

Question # 7

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

Question # 8

Good absorbers of heat are

Question # 9

When two objects are rubbed together, their internal energy

Question # 10

Hotness and coldness of an object is represented in terms:

Question # 11

Electromagnetic waves emitted by hot bodies are called:

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

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 # 16

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

Question # 17

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

Question # 18

While deriving the equation for pressure of a gas we consider the

Question # 19

A heat engine is that which converts

Question # 20

A carnot cycle consists of

Question # 21

We cannot utilize the heat contents of oceans and atmosphere because

Question # 22

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

Question # 23

The value of E0in coulomb's law is:

Question # 24

One kilogram of different substances contain

Question # 25

First law of thermodynamics is consequence of conservation of

Question # 26

The example of irreversible process is

Question # 27

If denotes the total number of molecules in cubic vessel such that m is mass of each milecule and I is length of each side of vessel, then mN/I3gives the:

Question # 28

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

Question # 29

Hydrogen and helium of same volume V at same temperature T and same pressure P are mixed to have same volume V. The resulting pressure of the mixtures will be

Question # 30

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

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 Hotness and coldness of an object is represented in terms:
A. Heat
B. Temperature
C. Chemical energy
D. None of these
2 The example of reversible process is
A. an explosion
B. changes occur suddenly
C. slow compression of a gas
D. all of them
3 In an adiabatic expansion, the temperature of the gas
A. increases
B. becomes zero
C. decreases
D. decreases rapidly
4 According to kinetic theory of gases, molecules of a gas behave like
A. Inelastic spheres
B. Perfectly elastic rigid sphere
C. Perfectly elastic non-rigid spheres
D. Inelastic non-rigid spheres
5 Real gases strictly obey gas law at:
A. High pressure and low temperatures
B. Low pressures and high temperatures
C. High pressures and high temperatures
D. None of these
6 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
7 An amount of water of mass 20 g at 0°C is mixed with 40 g of water at 10°C. Final temperature of mixture is
A. -20°C
B. 6.67°C
C. 5°C
D. 0°C
8 In the study of thermodynamics, which gas is considered as the working substance
A. real gas
B. ideal gas
C. any gas may be ideal or real
D. none of them
9 Boyle's law is applicable in
A. Isochoric process
B. Isothermal process
C. Isobaric process
D. Isotonic process
10 In an ideal gas, the molecules have:
A. Kinetic energy only
B. Potential energy only
C. Both KE and PE
D. None of these

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