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 constant volume temperature is increased. Then

Question # 2

The length of a metallic rod is 5 meter at 100°C. The coefficient of cubical expansion of the metal will be

Question # 3

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

Question # 4

At constant temperature, on increasing the pressure of a gas by 5%, its volume. The final temperature of the gas will be

Question # 5

Pressure of a gas at constant volume is proportion to

Question # 6

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

Question # 7

A heat engine is that which converts

Question # 8

The relationship between Boltzmann constant k with R and NAis given as:

Question # 9

The disorder in the system increases due to the

Question # 10

In an adiabatic expansion, the temperature of the gas

Question # 11

The pressure exerted by the gas is

Question # 12

Gas constant per molecule is called:

Question # 13

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

Question # 14

Which of the following is a state variable

Question # 15

First law of thermodynamics is consequence of conservation of

Question # 16

If an amount of heat enters the system it could

Question # 17

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 # 18

Triple point of water is

Question # 19

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

Question # 20

One kilogram of different substances contain

Question # 21

The curve representing an isothermal process is called

Question # 22

In the study of thermodynamics, which gas is considered as the working substance

Question # 23

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

Question # 24

Pressure exerted by a gas is

Question # 25

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

Question # 26

On the compression stroke of the petrol engine, the inlet value is closed and the mixture is compressed

Question # 27

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

Question # 28

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

Question # 29

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

Question # 30

It is impossible to devise a processes which may convert heat, extracted from a single reservoir, entirely into work without leaving any change in the working system. This is the statement of

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 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
2 In all natural processes where heat flows from one system to another, there is always a net
A. decrease in entropy
B. increase in entropy
C. decrease or increase in entropy
D. none of them
3 Rice takes longest to cook
A. In a submarine 100 m below the surface of the sea
B. At sea level
C. At Murree
D. At Mount Everest
4 The heat required to raise the temperature of one mole of the gas through 1 K at constant volume is called
A. heat capacity
B. specific heat capacity
C. molar specific heat
D. molar specific heat at constant volume
5 The work done on the system by the environment is considered as
A. positive
B. negative
C. zero
D. any one of them
6 If a process cannot be retraced in the backward direction by reversing the controlling factors, it is
A. a reversible process
B. an irreversible process
C. any one of them
D. both of them
7 The second law of thermodynamics is concerned with the circumstances in which
A. heat can be converted into work
B. direction of flow of heat
C. none of them
D. both of them
8 The absolute temperature for an ideal gas is
A. directly proportional to the rotational K.E of gas molecules
B. directly proportional to the vibrational K.E of gas molecules
C. directly proportional to the average translational K.E.of gas molecules
D. directly proportional to the P.E. of gas molecules
9 In case of an ideal gas, the P.E associated with its molecule is
A. maximum
B. zero
C. minimum
D. not fixed
10 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

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