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

One mole of any substance contain

Question # 2

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

Question # 3

Heat travels through vacuum by

Question # 4

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 # 5

Absolute temperature can be calculated by

Question # 6

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

Question # 7

When two objects come to common temperature, the body is said to be in:

Question # 8

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

Question # 9

In an adiabatic process the work is done at the expense of the

Question # 10

The rate of change of momentum of a molecule is equal to:

Question # 11

When two objects are rubbed together, their internal energy

Question # 12

Boyle's law is applicable in

Question # 13

The concept of entropy was introduced into the study of thermodynamics in

Question # 14

Adiabatic change occurs when the gas

Question # 15

Energy gas behaves like an ideal gast at

Question # 16

We can express the work in term of

Question # 17

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

Question # 18

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

Question # 19

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

Question # 20

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

Question # 21

A real gas can be approximated to an ideal gas at

Question # 22

On the exaust stroke, the outlet values opens. The residual gases are expelled and piston moves

Question # 23

Carnot heat engine only used

Question # 24

Tick the correct pair when M denotes the molecular mass and other symbols carry usual meanings:

Question # 25

A heat engine is that which converts

Question # 26

Rice takes longest to cook

Question # 27

Pressure of a gas at constant volume is proportion to

Question # 28

One kilogram of different substances contain

Question # 29

The volume of given mass of a gas will be doubled at atmosphere pressure if the temperature of the gas is changed from 150°C to

Question # 30

The second law of thermodynamics is concerned with the circumstances in which

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 A process is a reversible process, if the entropy of the system
A. increases
B. decreases
C. remains constant
D. none of them
2 The percentage of available heat energy converted into work by a diesel engine is roughly
A. 35 %`
B. 40 %
C. 35 - 40 %
D. 25 %
3 A process in which no heat enters or leaves the system is called
A. isochoric process
B. isothermal process
C. adiabatic process
D. none of them
4 If the volume of the gas is to be increased by 4 times, then
A. Temperature and pressure must be doubled
B. At constant P the temperature must be increased by 4 times
C. At constant T the pressure must be increased by four times
D. It cannot be increased
5 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
6 The number of translation degress of freedom for a diatomic gas is
A. 2
B. 3
C. 5
D. 6
7 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
8 Average KE of a gas molecule has:
A. Direct relation with absolute temperature and inverse relation with pressure
B. Direction relation with both absolute temperature and pressure
C. Inverse relation with both absolute temperature and pressure
D. None of these
9 10 c.c. each of oxygen and hydrogen are kept in separate flasks. Then which of the following relations is correct?
A. Each have same number of molecules
B. Don't have same number of molecules
C. Can't be predicted
D. None
10 Maximum density of H2O is at the temperature
A. 32°F
B. 39.2°F
C. 42°F
D. 4°F

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