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

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

Question # 2

Truth of kinetic energy is confirmed by:

Question # 3

On a cold morning a metal surface will fell colder to touch than a wooden surface, because

Question # 4

Rate of diffusion is

Question # 5

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

Question # 6

Boyle's law is applicable in

Question # 7

The Boltzman constant has the value

Question # 8

The pressure exerted by the gas is

Question # 9

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

Question # 10

Adiabatic change occurs when the gas

Question # 11

The ideal gas law is

Question # 12

In the formula P = N0KT, N0denotes:

Question # 13

At what temperature the adiabatic change is equivalent to the isothermal change?

Question # 14

When two objects are rubbed together, their internal energy

Question # 15

The curve representing an adiabatic process is called

Question # 16

For the working of a heat engine, there must be

Question # 17

Pressure of a gas at constant volume is proportion to

Question # 18

A gas is compressed adiabatically till its temperature is double. The ratio of its final volume to initial volume will be

Question # 19

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 # 20

Sadi carnot described an ideal heat engine in

Question # 21

An isochoric process is one which take place at

Question # 22

R.M.S velocity of a particle is V at pressure P. If pressure increases by two times, then R.M.S velocity becomes

Question # 23

The volume of universal gas constant R is:

Question # 24

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

Question # 25

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

Question # 26

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

Question # 27

The efficiency of petrol engine is usually not more than 25% to 30% because of

Question # 28

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

Question # 29

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

Question # 30

Absolute temperature can be calculated by

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 Pressure may be define as _______ per second per unit area:
A. Change in force
B. Change in momentum
C. Change in energy
D. Work done
2 If a process cannot be retraced in the backward direction by reversing the controlling factors, it is
A. a reversible process
B. an irreversible process
C. any one of them
D. both of them
3 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
A. P=P/V<1/2mv2>
B. P=2N/V<1/2mv2>
C. P=2/3N/V<1/2mv2>
D. P=2/3N/V<mv2>
4 A gas which strictly obeys the gas laws under all conditions of temperature and pressure is called:
A. Ideal gas
B. Inert gas
C. Real gas
D. None of these
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 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
7 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
A. 300°C
B. 573°C
C. 600°C
D. 743°C
8 Pressure exerted by a gas is
A. Independent of density of the gas
B. Inversely proportional to the density of the gas
C. Directly proportional to the square of the density of the gas
D. Directly proportional to the density of the gas
9 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
10 When two objects are rubbed together, their internal energy
A. remains same
B. decreases
C. remains the same then decreases
D. increases

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