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

Question # 2

Hotness and coldness of an object is represented in terms:

Question # 3

Pressure of a gas at constant volume is proportion to

Question # 4

The pressure exerted by the gas is

Question # 5

In a heat engine, heat is supplied by the

Question # 6

In the theory of dimensional analysis, heat may be properly represented by:

Question # 7

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 # 8

Absolute temperature can be calculated by

Question # 9

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

Question # 10

Which of the following is not thermo dynamical function?

Question # 11

A carnot cycle consists of

Question # 12

Which of the following is a state variable

Question # 13

Generally a temperature scale is established by

Question # 14

The example of reversible process is

Question # 15

The highest efficiency of a heat engine whose low temperature is 17°C and the high temperature is 200°C is

Question # 16

Efficiency of carnot engine is independent of the

Question # 17

Good absorbers of heat are

Question # 18

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

Question # 19

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

Question # 20

No spark plug is needed in

Question # 21

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

Question # 22

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

Question # 23

When heat is removed from the system

Question # 24

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

Question # 25

The internal energy of an ideal gas system is generally the

Question # 26

Absolute zero is considered as that temperature at which:

Question # 27

On the compression stroke of the petrol engine, the inlet value is closed and the mixture is compressed

Question # 28

The Boltzman constant has the value

Question # 29

A succession of events which bring the system back to its initial condition is called

Question # 30

In case of an ideal gas, the P.E associated with its molecule is

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Sr.# Question Answer
1 A typical four stroke petrol engine undergoes how many successive processes in each cycle
A. one
B. two
C. three
D. four
2 The temperature scale approved in SI units is:
A. Celsius scale
B. Kelvin scale
C. Fehrenheit scale
D. None of these
3 Heat travels through vacuum by
A. Conduction
B. Convection
C. Radiation
D. Both A and B
4 First law of thermodynamics is consequence of conservation of
A. Work
B. Energy
C. Heat
D. All of these
5 Amount of heat required to raise the temperature of a body through 1 K is called its
A. Specific heat
B. Water equivalent
C. Thermal capacity
D. Entropy
6 The earliest heat engine was
A. petrol engine
B. diesel engine
C. electric engine
D. steam engine
7 The bicycle pump provides a good example of
A. first law of thermodynamics
B. second law of thermodynamics
C. third law of thermodynamics
D. none of them
8 At constant temperature, on increasing the pressure of a gas by 5%, its volume. The final temperature of the gas will be
A. 81 K
B. 355 K
C. 627 K
D. 627°C
9 First law of thermodynamic is special case of
A. Law of conservation of energy
B. Charle's law
C. Law of conservation of mass
D. Boyle's law
10 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%
11 The work done on the system by the environment is considered as
A. positive
B. negative
C. zero
D. any one of them
12 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
13 If a molecule with momentum mv strikes a wall and rebound then the change in momentum will be:
A. -2 mv
B. Zero
C. 2 mv
D. mv
14 The process which is carried out at constant temperature is known as
A. adiabatic process
B. isothermal process
C. isochoric process
D. none of them
15 A process is a reversible process, if the entropy of the system
A. increases
B. decreases
C. remains constant
D. none of them
16 While deriving equation of pressure by kinetic theory of gases, we take into account:
A. Only linear motion of molecules
B. Only rotational motion
C. Only vibratory motion
D. All of these
17 A diatomic gas molecule has
A. translational energy
B. rotaional energy
C. vibrational energy
D. all of them
18 When heat is added into the system then change in entropy is
A. negative
B. positive
C. zero
D. any one of them
19 One mole of any substance contain
A. same number of molecules
B. different number of molecules
C. may be same or different
D. none of them
20 At O° K which of the following properties of a gas will be zero?
A. Kinetic energy
B. Potential energy
C. Vibrational energy
D. Density
21 An isochoric process is one which take place at
A. Constant internal energy
B. Constant entropy
C. Constant volume
D. Constant pressure
22 On colliding in a closed container, the gas molecules
A. Transfer momentum to the walls
B. Momentum becomes zero
C. Move in opposite directions
D. Perform Brownian motion
23 In which process the condition for the application of Boyle's law on the gas is fulfilled
A. isochoric process
B. adiabatic process
C. isothermal process
D. none of them
24 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
25 Carnot heat engine only used
A. isothermal processes
B. adiabatic processes
C. both of them
D. none of them
26 A reversible cycle is the one in which
A. some of the changes are reversible
B. all of the changes are reversible
C. all of the changes are irreversible
D. none of them
27 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
28 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
29 Pressure applied at any point of gas at rest is transmitted equally to all parts of the gas. This is the statement of:
A. Newton's second law
B. Pascal's law
C. Carnot theorem
D. Second law of thermodynamics
30 Rice takes longest to cook
A. In a submarine 100 m below the surface of the sea
B. At sea level
C. At Murree
D. At Mount Everest

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