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

On the power stroke, a spark fires the mixtures causing a rapid increase in pressure and temperature and the burning mixture expands

Question # 2

The highest efficiency of a heat engine whose low temperature is 17°C and the high temperature is 200°C is

Question # 3

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 # 4

Triple point of water is

Question # 5

Rice takes longest to cook

Question # 6

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

Question # 7

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

Question # 8

A real gas can be approximated to an ideal gas at

Question # 9

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

Question # 10

Electromagnetic waves emitted by hot bodies are called:

Question # 11

Which of the following is not thermo dynamical function?

Question # 12

First law of thermodynamics tells us that heat energy can be converted into equivalent amount of work, but it is silent about

Question # 13

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

Question # 14

Pressure exerted by a gas is

Question # 15

Which quantity is important in stating the entropy of the system

Question # 16

In an adiabatic expansion, the temperature of the gas

Question # 17

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

Question # 18

The volume of universal gas constant R is:

Question # 19

At constant volume temperature is increased. Then

Question # 20

Melting point of ice

Question # 21

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

Question # 22

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

Question # 23

A reversible cycle is the one in which

Question # 24

If N is the total number of molecules and V is the volume of the container, then the expression for the pressure of gas is

Question # 25

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

Question # 26

The ideal gas law is

Question # 27

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

Question # 28

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

Question # 29

Amount of heat required to raise the temperature of a body through 1 K is called its

Question # 30

An isochoric process is one which take place at

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 Energy gas behaves like an ideal gast at
A. High temperature and low pressure
B. Low temperature and high pressure
C. Both A and B
D. None
2 A typical four stroke petrol engine undergoes how many successive processes in each cycle
A. one
B. two
C. three
D. four
3 An irreversible heat flow from a hot to cold substances of a system, causes the disorder to
A. decrease
B. remains the same
C. increase
D. any one of them
4 Triple point of water is
A. 273.16°F
B. 372.16K
C. 273.16°F
D. 273.16
5 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 %
6 The temperature of gas is produced by
A. At potential energy of its molecules
B. The kinetic energy of its molecules
C. The attractive force between its molecules
D. The repulsive force between its molecules
7 On the exaust stroke, the outlet values opens. The residual gases are expelled and piston moves
A. outwards
B. inwards
C. in either way
D. none of these
8 First law of thermodynamics is consequence of conservation of
A. Work
B. Energy
C. Heat
D. All of these
9 The percentage of available heat energy converted into work by a diesel engine is roughly
A. 35 %`
B. 40 %
C. 35 - 40 %
D. 25 %
10 The temperature scale approved in SI units is:
A. Celsius scale
B. Kelvin scale
C. Fehrenheit scale
D. None of these

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