ECAT Pre Engineering Physics Chapter 11 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 11 Heat & Thermodynamics

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 11 Heat & Thermodynamics

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Physics ECAT Pre Engineering Chapter 11 Heat & Thermodynamics

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Question # 1

The example of reversible process is

Question # 2

At absolute temperature, the kinetic energy of the molecules

Question # 3

One kilogram of different substances contain

Question # 4

Brownian motion increases due to

Question # 5

In an ideal gas, the molecules have:

Question # 6

In all natural processes where heat flows from one system to another, there is always a net

Question # 7

In a heat engine, heat is supplied by the

Question # 8

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

Question # 9

No spark plug is needed in

Question # 10

The disorder in the system increases due to the

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

First law of thermodynamics is consequence of conservation of

Question # 16

The work done by the system on its environment is considered as

Question # 17

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

Question # 18

Sadi carnot described an ideal heat engine in

Question # 19

A gas which strictly obeys the gas laws under all conditions of temperature and pressure is called:

Question # 20

The basis to define a temperature scale that is independent of material properties is provided by

Question # 21

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

Question # 22

The internal energy of a system does not depend upon the

Question # 23

Melting point of ice

Question # 24

The value of E0in coulomb's law is:

Question # 25

The rate of change of momentum of a molecule is equal to:

Question # 26

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

Question # 27

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

Question # 28

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

Question # 29

The motion of molecules in gases is:

Question # 30

The pressure of gas everywhere inside the vessel will be the same provided the gas is of

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Sr.# Question Answer
1 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
2 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
3 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
4 The efficiency of carnot engine cannot be 100% or one unless cold reservoir is at
A. 100 K
B. 273 K
C. 0 K
D. -273 K
5 If a liquid is heated in weightlessness, the heat is transmitted through
A. Conduction
B. Convection
C. Radiation
D. Neither, because the liquid cannot be heated in weightlessness
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 An amount of water of mass 20 g at 0°C is mixed with 40 g of water at 10°C. Final temperature of mixture is
A. -20°C
B. 6.67°C
C. 5°C
D. 0°C
8 The example of reversible process is
A. an explosion
B. changes occur suddenly
C. slow compression of a gas
D. all of them
9 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
10 When two objects come to common temperature, the body is said to be in:
A. Static equilibrium
B. Dynamic equilibrium
C. Thermal equilibrium
D. None of these
11 Pressure of a gas at constant volume is proportion to
A. Total energy of gas
B. Average P.E to molecules
C. Average K.E of molecules
D. Total internal energy of gas
12 A diatomic gas molecule has
A. translational energy
B. rotaional energy
C. vibrational energy
D. all of them
13 No spark plug is needed in
A. petrol engine
B. diesel engine
C. both of them
D. none of them
14 The ideal gas law is
A. P = nRT
B. V = nRT
C. PV =RT
D. PV =nRT
15 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
16 Carnot heat engine only used
A. isothermal processes
B. adiabatic processes
C. both of them
D. none of them
17 The Boltzman constant has the value
A. 1.38 x 10-23JK-1
B. 1.28 x 10-23JK-1
C. 1.38 x 10-26JK-1
D. 1.28 x 10-26JK-1
18 If the ratio of densities of two gases is 1:4, then the ratio of their rates of diffusion into one another is
A. 2 : 1
B. 4 : 1
C. 1 : 4
D. 3 : 4
19 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
20 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
21 Specific heat at constant pressure is greater than the specific heat at constant volume because
A. Heat is used up to increase temperature at constant pressure
B. Heat is used by gas for expansions purposes at constant pressure
C. Heat is use dup to increase internal energy
D. The above statement is invalid
22 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
23 The internal energy of an ideal gas system is generally the
A. translational K.E of molecules
B. vibrational K.E of molecules
C. rotational K.E of molecules
D. all of them
24 The concept of entropy was introduced into the study of thermodynamics in
A. 1856
B. 1865
C. 1656
D. 1685
25 When the temperature of source and sink of a heat engine become equal entropy change will be
A. Zero
B. Max
C. Min
D. -ve
26 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
27 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
28 The basis to define a temperature scale that is independent of material properties is provided by
A. carbon cycle
B. nitrogen cycle
C. Carnot cycle
D. irreversible cycle
29 Heat required to raise the temperature of one mole of a gas through 1 K at constant pressure is called
A. heat capacity
B. specific heat capacity
C. specific heat at constant volume
D. specific heat at constant pressure
30 An irreversible heat flow from a hot to cold substances of a system, causes the disorder to
A. decrease
B. remains the same
C. increase
D. any one of them

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