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

A diatomic gas molecule has

Question # 2

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

Question # 3

The nature of thermal radiation is similar to:

Question # 4

The length of a metallic rod is 5 meter at 100°C. The coefficient of cubical expansion of the metal will be

Question # 5

The value of E0in coulomb's law is:

Question # 6

In thermodynamics, internal energy is the function of

Question # 7

At constant volume temperature is increased. Then

Question # 8

In the reverse process, the working substance passes through the same stages as in the direct process and

Question # 9

We can express the work in term of

Question # 10

For the working of a heat engine, there must be

Question # 11

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

Question # 12

When heat is removed from the system

Question # 13

Carnot heat engine only used

Question # 14

One mole of any substance contain

Question # 15

If R is gas constant for 1 gram mole, Cpand Cvare specific heat for a solid then

Question # 16

First law of thermodynamic is special case of

Question # 17

The second law of thermodynamics is concerned with the circumstances in which

Question # 18

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

Question # 19

For making cooking utensils, which of the following pairs of properties is most suited?

Question # 20

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

Question # 21

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 # 22

In an adiabatic process the work is done at the expense of the

Question # 23

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

Question # 24

When heat is added into the system then change in entropy is

Question # 25

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

Question # 26

Melting point of ice

Question # 27

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

Question # 28

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

Question # 29

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 # 30

Brownian motion increases due to

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Sr.# Question Answer
1 The earliest heat engine was
A. petrol engine
B. diesel engine
C. electric engine
D. steam engine
2 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
3 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
4 Electromagnetic waves emitted by hot bodies are called:
A. Photoelectrons
B. Alpha rays
C. Thermal radiation
D. None of these
5 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
6 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
7 The curve representing an isothermal process is called
A. adiabat
B. isotherm
C. fixed temperature
D. none of them
8 The nature of thermal radiation is similar to:
A. Ultraviolet rays
B. Light rays
C. Both of them
D. None of these
9 If the distance between two charges is doubled, the force between them will become:
A. Double
B. Half
C. Three times
D. One fourth
10 On the exaust stroke, the outlet values opens. The residual gases are expelled and piston moves
A. outwards
B. inwards
C. in either way
D. none of these
11 Heat travels through vacuum by
A. Conduction
B. Convection
C. Radiation
D. Both A and B
12 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
13 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
14 In all natural processes where heat flows from one system to another, there is always a net
A. decrease in entropy
B. increase in entropy
C. decrease or increase in entropy
D. none of them
15 At what temperature the adiabatic change is equivalent to the isothermal change?
A. Zero degree Celsius
B. Zero Kelvin
C. Critical temperature
D. Above critical temperature
16 On a cold morning a metal surface will fell colder to touch than a wooden surface, because
A. Metal has high specific heat
B. Metal has high thermal conductivity
C. Metal has low specific heat
D. Metal has low thermal conductivity
17 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>
18 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 %
19 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
20 No spark plug is needed in
A. petrol engine
B. diesel engine
C. both of them
D. none of them
21 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
22 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
23 The internal energy of a system does not depend upon the
A. initial state of the system
B. final state of the system
C. path
D. none of them
24 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
25 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
26 The disorder in the system increases due to the
A. removal of heat
B. addition of heat
C. removal or addition of heat
D. none of them
27 The kinetic energy of one molecule of a gas at normal temperature and pressure will be (k = 8.31 J/mole K) :
A. 1.7 x 103J
B. 10.2 x 103J
C. 3..4 x 103J
D. 6.8 x 103J
28 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
29 Which of the following is a state variable
A. entropy
B. pressure
C. volume
D. all of them
30 At constant volume temperature is increased. Then
A. Collision on walls will be less
B. Number of collisions per unit time will increase
C. Collision will be in straight lines
D. Collision will not change

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