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

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

Question # 2

A process which can be retraced in exactly reverse order, without producing any change in the surroundings is called

Question # 3

A succession of events which bring the system back to its initial condition is called

Question # 4

In the formula P = N0KT, N0denotes:

Question # 5

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

Question # 6

If 42 J heat is transferred to the system and the work done by the system is 32 J then what will be the change in internal energy

Question # 7

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 # 8

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

Question # 9

Pressure may be define as _______ per second per unit area:

Question # 10

At constant volume temperature is increased. Then

Question # 11

Good absorbers of heat are

Question # 12

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

Question # 13

The bicycle pump provides a good example of

Question # 14

The temperature of gas is produced by

Question # 15

Which of the following is a state variable

Question # 16

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

Question # 17

The kinetic energy of one molecule of a gas at normal temperature and pressure will be (k = 8.31 J/mole K) :

Question # 18

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 # 19

The Boltzman constant has the value

Question # 20

One mole of any substance contain

Question # 21

In an adiabatic expansion, the temperature of the gas

Question # 22

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

Question # 23

Average KE of a gas molecule has:

Question # 24

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

Question # 25

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

Question # 26

The earliest heat engine was

Question # 27

The ideal gas law is

Question # 28

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

Question # 29

First law of thermodynamic is special case of

Question # 30

Maximum density of H2O is at the temperature

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 The percentage of available heat energy converted into work by a petrol engine is roughly
A. 35 %
B. 40 %
C. 35 to 40 %
D. 25 %
2 The motion of molecules in gases is:
A. Orderly
B. Random
C. Circular
D. All of these
3 Pressure exerted by a gas is
A. Independent of density of the gas
B. Inversely proportional to the density of the gas
C. Directly proportional to the square of the density of the gas
D. Directly proportional to the density of the gas
4
During the whole carnot cycle
A. Thermal equilibrium is maintained
B. mechanical equilibrium is maintained
C. both the thermal and mechanical equilibriumis maintained
D. both the thermal and mechanical equilibrium is not maintained
5 The efficiency of petrol engine is usually not more than 25% to 30% because of
A. friction
B. heat losses
C. both of them
D. none of them
6 When two objects come to common temperature, the body is said to be in:
A. Static equilibrium
B. Dynamic equilibrium
C. Thermal equilibrium
D. None of these
7 In the formula P = N0KT, N0denotes:
A. Number of molecules per unit per volume
B. Number of moles
C. Number of molecules
D. None of these
8 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
9 Generally a temperature scale is established by
A. one fixed point
B. two fixed point
C. three fixed point
D. four fixed point
10 A diatomic gas molecule has
A. translational energy
B. rotaional energy
C. vibrational energy
D. all of them

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