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

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 # 2

Efficiency of carnot engine is independent of the

Question # 3

Pressure exerted by a gas is

Question # 4

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

Question # 5

A typical four stroke petrol engine undergoes how many successive processes in each cycle

Question # 6

If a molecule with momentum mv strikes a wall and rebound then the change in momentum will be:

Question # 7

In which process the condition for the application of Boyle's law on the gas is fulfilled

Question # 8

At constant volume temperature is increased. Then

Question # 9

The curve representing an isothermal process is called

Question # 10

One kilogram of different substances contain

Question # 11

When two objects are rubbed together, their internal energy

Question # 12

A carnot cycle consists of

Question # 13

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

Question # 14

The disorder in the system increases due to the

Question # 15

At absolute temperature, the kinetic energy of the molecules

Question # 16

Electromagnetic waves emitted by hot bodies are called:

Question # 17

Gas constant per molecule is called:

Question # 18

First law of thermodynamic is special case of

Question # 19

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

Question # 20

Carnot heat engine only used

Question # 21

Pressure of a gas at constant volume is proportion to

Question # 22

For the working of a heat engine, there must be

Question # 23

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

Question # 24

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

Question # 25

A diatomic gas molecule has

Question # 26

A reversible cycle is the one in which

Question # 27

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

Question # 28

The pressure exerted by the gas is

Question # 29

Triple point of water is

Question # 30

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

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 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
2 The internal energy of a system does not depend upon the
A. initial state of the system
B. final state of the system
C. path
D. none of them
3 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
A. 0°C
B. 10°C
C. 17°C
D. 20°C
4 Heat travels through vacuum by
A. Conduction
B. Convection
C. Radiation
D. Both A and B
5 Generally a temperature scale is established by using certain physical properties of a material which varies
A. nonlinearly with temperature
B. linearly with temperature
C. either of them
D. none of them
6 The curve representing an isothermal process is called
A. adiabat
B. isotherm
C. fixed temperature
D. none of them
7 A process which can be retraced in exactly reverse order, without producing any change in the surroundings is called
A. reversible process
B. irreversible process
C. any one of them
D. none of them
8 The absolute temperature of the tripple point of water is
A. 100°C
B. 4°C
C. 373 K
D. 273.16 K
9 A succession of events which bring the system back to its initial condition is called
A. reversible process
B. irreversible process
C. a cycle
D. none of them
10 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

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