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

The bicycle pump provides a good example of

Question # 2

Absolute temperature can be calculated by

Question # 3

Good absorbers of heat are

Question # 4

At O° K which of the following properties of a gas will be zero?

Question # 5

The volume of universal gas constant R is:

Question # 6

First law of thermodynamic is special case of

Question # 7

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

Question # 8

Hotness and coldness of an object is represented in terms:

Question # 9

The volume of given mass of a gas will be doubled at atmosphere pressure if the temperature of the gas is changed from 150°C to

Question # 10

The efficiency of diesel engine is

Question # 11

10 c.c. each of oxygen and hydrogen are kept in separate flasks. Then which of the following relations is correct?

Question # 12

Energy gas behaves like an ideal gast at

Question # 13

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

Question # 14

It is impossible to devise a processes which may convert heat, extracted from a single reservoir, entirely into work without leaving any change in the working system. This is the statement of

Question # 15

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

Question # 16

During the whole carnot cycle

Question # 17

In an adiabatic expansion, the temperature of the gas

Question # 18

The number of translation degress of freedom for a diatomic gas is

Question # 19

Adiabatic change occurs when the gas

Question # 20

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

Question # 21

The earliest heat engine was

Question # 22

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

Question # 23

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

Question # 24

If the formula PV = nRT, n denotes:

Question # 25

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

Question # 26

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

Question # 27

A real gas can be approximated to an ideal gas at

Question # 28

In the formula P = N0KT, N0denotes:

Question # 29

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

Question # 30

Boyle's law is applicable in

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Sr.# Question Answer
1 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
2 The relationship between Boltzmann constant k with R and NAis given as:
A. k = RNA
B. k =R/NA
C. k = NR/NA
D. None of these
3 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
4 Boyle's law is applicable in
A. Isochoric process
B. Isothermal process
C. Isobaric process
D. Isotonic process
5 We can express the work in term of
A. directly measurable variables
B. indirectly measurable variables
C. either of them
D. both of them
6 Absolute zero is considered as that temperature at which:
A. All liquid become gases
B. All gases become liquid
C. Water freezes
D. None of these
7 No spark plug is needed in
A. petrol engine
B. diesel engine
C. both of them
D. none of them
8 The rate of change of momentum of a molecule is equal to:
A. Pressure
B. Work
C. Density
D. Force
9 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
10 Good absorbers of heat are
A. Poor emitters
B. Non emitters
C. Good emitters
D. Highly polarized
11 In an adiabatic process the work is done at the expense of the
A. energy supplied to the system
B. energy gained from the surroundings
C. internal energy
D. none of them
12 Melting point of ice
A. Increases with increasing pressure
B. Decreases with increasing pressure
C. Is independent of pressure
D. Is proportional to pressure
13 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
14 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
15 Carnot heat engine only used
A. isothermal processes
B. adiabatic processes
C. both of them
D. none of them
16 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
17 The work done by the system on its environment is considered as
A. positive
B. negative
C. zero
D. any one of them
18 A carnot cycle consists of
A. One step
B. two step
C. three steps
D. four steps
19 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
20 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
21 The curve representing an isothermal process is called
A. adiabat
B. isotherm
C. fixed temperature
D. none of them
22 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
23 The efficiency of petrol engine is usually not more than 25% to 30% because of
A. friction
B. heat losses
C. both of them
D. none of them
24 The pressure of gas everywhere inside the vessel will be the same provided the gas is of
A. Non-uniform density
B. uniform density
C. high density
D. low density
25 A process is a reversible process, if the entropy of the system
A. increases
B. decreases
C. remains constant
D. none of them
26 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
A. 0°C
B. 10°C
C. 17°C
D. 20°C
27 When heat is added into the system then change in entropy is
A. negative
B. positive
C. zero
D. any one of them
28 A real gas can be approximated to an ideal gas at
A. Low density
B. High pressure
C. High density
D. Low temperature
29 When two objects are rubbed together, their internal energy
A. remains same
B. decreases
C. remains the same then decreases
D. increases
30 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

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