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

If water in a closed bottle is taken up to the moon and opened, the water gets

Question # 2

The only significant motion possessed by the mono-atomic gas represented is:

Question # 3

Absolute temperature can be calculated by

Question # 4

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

Question # 5

In the study of thermodynamics, which gas is considered as the working substance

Question # 6

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

Question # 7

The temperature scale approved in SI units is:

Question # 8

We can express the work in term of

Question # 9

Average KE of a gas molecule has:

Question # 10

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

Question # 11

If a molecule with momentum mv strikes a wall and rebound then the change in momentum will be:

Question # 12

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

Question # 13

The value of E0in coulomb's law is:

Question # 14

A diatomic gas molecule has

Question # 15

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

Question # 16

Gas constant per molecule is called:

Question # 17

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

Question # 18

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 # 19

In an adiabatic expansion, the temperature of the gas

Question # 20

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

Question # 21

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

Question # 22

First law of thermodynamics is consequence of conservation of

Question # 23

Which of the following is not an assumption of kinetic energy

Question # 24

The product of the pressure and volume of an ideal gas is

Question # 25

Hydrogen and helium of same volume V at same temperature T and same pressure P are mixed to have same volume V. The resulting pressure of the mixtures will be

Question # 26

Maximum density of H2O is at the temperature

Question # 27

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

Question # 28

Internal energy is the sum of all the forms of

Question # 29

Hotness and coldness of an object is represented in terms:

Question # 30

A carnot cycle consists of

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 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
2 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
3 In the reverse process, the working substance passes through the same stages as in the direct process and
A. thermal effects at each stage are exactly reversed
B. mechanical effects at each stage are exactly reversed
C. thermal and mechanical effects at each stage remain the same
D. thermal and mechanical effects at each stage are exactly reversed
4 Heat travels through vacuum by
A. Conduction
B. Convection
C. Radiation
D. Both A and B
5 The highest efficiency of a heat engine whose low temperature is 17°C and the high temperature is 200°C is
A. 70%
B. 100%
C. 35%
D. 38%
6 The state in which ice, water and vapour coexists in equilibrium is called
A. zero degree celsius
B. zero degree fahrenheit
C. absolute zero
D. 373 K
7 The volume of universal gas constant R is:
A. 8.314 J/K mole K
B. 8314 J/K mole K
C. 8.314 J/mole K
D. None of these
8 Which quantity is important in stating the entropy of the system
A. initial entropy
B. final entropy
C. change in entropy
D. none of them
9 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
10 A heat engine is that which converts
A. mechanical energy into thermal energy
B. thermal energy into mechanical energy
C. K.E into potential energy
D. heat energy into light energy

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