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

Rice takes longest to cook

Question # 2

If the volume of the gas is to be increased by 4 times, then

Question # 3

The example of irreversible process is

Question # 4

For the working of a heat engine, there must be

Question # 5

According to kinetic theory of gases, molecules of a gas behave like

Question # 6

The example of reversible process is

Question # 7

Pressure of a gas at constant volume is proportion to

Question # 8

The internal energy of an ideal gas system is generally the

Question # 9

According to the second law, which is must to produce work

Question # 10

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

Question # 11

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

Question # 12

Maximum density of H2O is at the temperature

Question # 13

Generally a temperature scale is established by using certain physical properties of a material which varies

Question # 14

The curve representing an adiabatic process is called

Question # 15

Boyle's law is applicable in

Question # 16

Which of the following is not thermo dynamical function?

Question # 17

The kinetic energy of one molecule of a gas at normal temperature and pressure will be (k = 8.31 J/mole K) :

Question # 18

In the formula P = N0KT, N0denotes:

Question # 19

The efficiency of diesel engine is

Question # 20

Internal energy is the sum of all the forms of

Question # 21

When heat is added into the system then change in entropy is

Question # 22

We can express the work in term of

Question # 23

The Boltzman constant has the value

Question # 24

Pressure may be define as _______ per second per unit area:

Question # 25

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 # 26

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

Question # 27

Adiabatic change occurs when the gas

Question # 28

The value of E0in coulomb's law is:

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

Pressure exerted by a gas is

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 According to the second law, which is must to produce work
A. a source contains a large amount of heat energy
B. two sources at the same temperature
C. two sources at the different temperatures
D. a source contains a small amount of energy
2 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
3 In a heat engine, heat is supplied by the
A. cold reservoir
B. sink
C. hot reservoir
D. none of them
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 Sadi carnot described an ideal heat engine in
A. 1820
B. 1840
C. 1860
D. 1880
6 Electromagnetic waves emitted by hot bodies are called:
A. Photoelectrons
B. Alpha rays
C. Thermal radiation
D. None of these
7 Internal energy is the sum of all the forms of
A. K.E
B. P.E
C. both of them
D. none of them
8 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:
A. Force
B. Density
C. Work done
D. Pressure
9 At constant volume temperature is increased. Then
A. Collision on walls will be less
B. Number of collisions per unit time will increase
C. Collision will be in straight lines
D. Collision will not change
10 The kinetic energy of one molecule of a gas at normal temperature and pressure will be (k = 8.31 J/mole K) :
A. 1.7 x 103J
B. 10.2 x 103J
C. 3..4 x 103J
D. 6.8 x 103J

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