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

During the whole carnot cycle

Question # 2

The unit of thermodynamical scale is

Question # 3

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

Question # 4

Generally a temperature scale is established by

Question # 5

What temperature is the same on Celsius scale as well as on Fahrenheit scale?

Question # 6

A heat engine is that which converts

Question # 7

Heat required to raise the temperature of one mole of a gas through 1 K at constant pressure is called

Question # 8

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

Question # 9

The heat required to raise the temperature of one mole of the substance through 1 K is called

Question # 10

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 # 11

When two objects are rubbed together, their internal energy

Question # 12

If R is gas constant for 1 gram mole, Cpand Cvare specific heat for a solid then

Question # 13

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

Question # 14

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

Question # 15

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

Question # 16

For making cooking utensils, which of the following pairs of properties is most suited?

Question # 17

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

Question # 18

Hotness and coldness of an object is represented in terms:

Question # 19

Which of the following is not thermo dynamical function?

Question # 20

Heat travels through vacuum by

Question # 21

The pressure of gas everywhere inside the vessel will be the same provided the gas is of

Question # 22

A real gas can be approximated to an ideal gas at

Question # 23

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

Question # 24

The example of irreversible process is

Question # 25

At absolute temperature, the kinetic energy of the molecules

Question # 26

The pressure exerted by the gas is

Question # 27

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

Question # 28

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

Question # 29

A carnot cycle consists of

Question # 30

In a heat engine, heat is supplied by the

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 At what temperature the adiabatic change is equivalent to the isothermal change?
A. Zero degree Celsius
B. Zero Kelvin
C. Critical temperature
D. Above critical temperature
2 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
3 A typical four stroke petrol engine undergoes how many successive processes in each cycle
A. one
B. two
C. three
D. four
4 The percentage of available heat energy converted into work by a diesel engine is roughly
A. 35 %`
B. 40 %
C. 35 - 40 %
D. 25 %
5 Which of the following is not an example of adiabatic process
A. the rapid escape of air from a burst type
B. the rapid expansion and compression of air through which a sound wave is passing
C. cloud formation in the atmosphere
D. none of them
6 The product of the pressure and volume of an ideal gas is
A. A constant
B. Approximately equal to the universal gas constant
C. Directly proportional to its temperature
D. Inversely proportional to its temperature
7 Maximum density of H2O is at the temperature
A. 32°F
B. 39.2°F
C. 42°F
D. 4°F
8 When the temperature of source and sink of a heat engine become equal entropy change will be
A. Zero
B. Max
C. Min
D. -ve
9 Absolute zero is considered as that temperature at which:
A. All liquid become gases
B. All gases become liquid
C. Water freezes
D. None of these
10 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
A. A greater than than of B
B. A is equal to that of B
C. A is less than that of B
D. A is twice the pressure of B

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