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

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

Question # 2

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

Question # 3

Rate of diffusion is

Question # 4

One kilogram of different substances contain

Question # 5

The behaviour of gases is well accounted by the kinetic theory based on

Question # 6

When two objects are rubbed together, their internal energy

Question # 7

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

Question # 8

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

Question # 9

At constant temperature, on increasing the pressure of a gas by 5%, its volume. The final temperature of the gas will be

Question # 10

The absolute temperature of the tripple point of water is

Question # 11

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

Question # 12

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 # 13

Which of the following is not an assumption of kinetic energy

Question # 14

During the whole carnot cycle

Question # 15

Internal energy is the sum of all the forms of

Question # 16

First law of thermodynamics is consequence of conservation of

Question # 17

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 # 18

Generally a temperature scale is established by

Question # 19

If a liquid is heated in weightlessness, the heat is transmitted through

Question # 20

The example of reversible process is

Question # 21

Brownian motion increases due to

Question # 22

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

Question # 23

In thermodynamics, internal energy is the function of

Question # 24

In the formula P = N0KT, N0denotes:

Question # 25

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

Question # 26

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

Question # 27

Triple point of water is

Question # 28

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

Question # 29

The temperature of gas is produced by

Question # 30

An isochoric process is one which take place at

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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 At the constant temperature, if the value of a given mass of a gas is double, then the density of gas becomes:
A. Double
B. Remains constant
C. Half
D. None of these
3 When heat is removed from the system
A. negative
B. positive
C. zero
D. any one of them
4 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
5 If 42 J heat is transferred to the system and the work done by the system is 32 J then what will be the change in internal energy
A. 0 J
B. 2 J
C. 5 J
D. 10 J
6 Tick the correct pair when M denotes the molecular mass and other symbols carry usual meanings:
A. N = nNAm = MNA
B. n = N NA, M = mNA
C. M = NA/N , NA= m/n
D. N = nNA, M = mNA
7 For the working of a heat engine, there must be
A. a source of heat at high temperature
B. a sink at low temperature
C. both of them
D. none of them
8 In thermodynamics, internal energy is the function of
A. temperature
B. pressure
C. state
D. none of them
9 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
A. second law thermodynamics
B. first law of thermodynamics
C. third law of thermodynamics
D. none of them
10 Brownian motion increases due to
A. Increase in size of Brownian particle
B. Increase in temperature of medium
C. Increase in density of medium
D. Increase in viscosity of medium
11 While deriving the equation for pressure of a gas we consider the
A. rotational motion of molecules
B. vibrational motion of molecules
C. linear motion of molecules
D. all of them
12 The length of a metallic rod is 5 meter at 100°C. The coefficient of cubical expansion of the metal will be
A. 2.0 x 10-5/°C
B. 4.0x10-5/°C
C. 6.0x10-5/°C
D. 2.33x10-5/°C
13 Truth of kinetic energy is confirmed by:
A. Diffusion of gases
B. Brownian motion
C. Both A and B
D. None of these
14 In an ideal gas, the molecules have:
A. Kinetic energy only
B. Potential energy only
C. Both KE and PE
D. None of these
15 If the formula PV = nRT, n denotes:
A. Number of molecules per unit volume
B. Number of moles
C. Number of molecules
D. None of these
16 A diatomic gas molecule has
A. translational energy
B. rotaional energy
C. vibrational energy
D. all of them
17 The earliest heat engine was
A. petrol engine
B. diesel engine
C. electric engine
D. steam engine
18 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%
19 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
20 Since the absolute scale is independent of the property of the working substance, hence, can be applied at
A. very high temperature
B. very low temperature
C. any one of them
D. none of them
21 An isochoric process is one which take place at
A. Constant internal energy
B. Constant entropy
C. Constant volume
D. Constant pressure
22 The only significant motion possessed by the mono-atomic gas represented is:
A. Translatory
B. Rotatory
C. Vibratory
D. None of these
23 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
A. R/2
B. P
C. 2P
D. Depending on the relative mass of the gases
24 One kilogram of different substances contain
A. same number of molecules
B. different number of molecules
C. may be same or different
D. none of them
25 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
26 The motion of molecules in gases is:
A. Orderly
B. Random
C. Circular
D. All of these
27 Real gases strictly obey gas law at:
A. High pressure and low temperatures
B. Low pressures and high temperatures
C. High pressures and high temperatures
D. None of these
28 Generally a temperature scale is established by using certain physical properties of a material which varies
A. nonlinearly with temperature
B. linearly with temperature
C. either of them
D. none of them
29 No spark plug is needed in
A. petrol engine
B. diesel engine
C. both of them
D. none of them
30 Which of the following is not thermo dynamical function?
A. Enthalpy
B. Work done
C. Gibb's energy
D. Internal energy

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