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

First law of thermodynamic is special case of

Question # 2

The value of E0in coulomb's law is:

Question # 3

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

Question # 4

Internal energy is the sum of all the forms of

Question # 5

One kilogram of different substances contain

Question # 6

The Boltzman constant has the value

Question # 7

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 # 8

In an ideal gas, the molecules have:

Question # 9

The process which is carried out at constant temperature is known as

Question # 10

The temperature scale approved in SI units is:

Question # 11

A process which can be retraced in exactly reverse order, without producing any change in the surroundings is called

Question # 12

The bicycle pump provides a good example of

Question # 13

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

Question # 14

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

Question # 15

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

Question # 16

The efficiency of diesel engine is

Question # 17

An irreversible heat flow from a hot to cold substances of a system, causes the disorder to

Question # 18

Which quantity is important in stating the entropy of the system

Question # 19

The pressure exerted by the gas is

Question # 20

The heat required to raise the temperature of one mole of the gas through 1 K at constant volume is called

Question # 21

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

Question # 22

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

Question # 23

The percentage of available heat energy converted into work by a petrol engine is roughly

Question # 24

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 # 25

If the distance between two charges is doubled, the force between them will become:

Question # 26

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

Question # 27

Energy gas behaves like an ideal gast at

Question # 28

Brownian motion increases due to

Question # 29

Rice takes longest to cook

Question # 30

Hotness and coldness of an object is represented in terms:

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Sr.# Question Answer
1 Pressure may be define as _______ per second per unit area:
A. Change in force
B. Change in momentum
C. Change in energy
D. Work done
2 If a process cannot be retraced in the backward direction by reversing the controlling factors, it is
A. a reversible process
B. an irreversible process
C. any one of them
D. both of them
3 We can express the work in term of
A. directly measurable variables
B. indirectly measurable variables
C. either of them
D. both of them
4 The volume of universal gas constant R is:
A. 8.314 J/K mole K
B. 8314 J/K mole K
C. 8.314 J/mole K
D. None of these
5 No spark plug is needed in
A. petrol engine
B. diesel engine
C. both of them
D. none of them
6 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
7 The heat required to raise the temperature of one mole of the substance through 1 K is called
A. heat capacity
B. specific heat capacity
C. molar specific heat
D. all of them
8 In the theory of dimensional analysis, heat may be properly represented by:
A. ML2T-2
B. MT-2
C. ML-1T-1
D. None of these
9 Adiabatic change occurs when the gas
A. expands
B. compressed
C. expands or compressed
D. expands or compressed rapidly
10 The motion of molecules in gases is:
A. Orderly
B. Random
C. Circular
D. All of these
11 R.M.S velocity of a particle is V at pressure P. If pressure increases by two times, then R.M.S velocity becomes
A. 2V
B. 3V
C. 0.5V
D. V
12 According to the second law, which is must to produce work
A. a source contains a large amount of heat energy
B. two sources at the same temperature
C. two sources at the different temperatures
D. a source contains a small amount of energy
13 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
14 The work done on the system by the environment is considered as
A. positive
B. negative
C. zero
D. any one of them
15 In thermodynamics, internal energy is the function of
A. temperature
B. pressure
C. state
D. none of them
16 A heat engine is that which converts
A. mechanical energy into thermal energy
B. thermal energy into mechanical energy
C. K.E into potential energy
D. heat energy into light energy
17 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
18 The absolute temperature for an ideal gas is
A. directly proportional to the rotational K.E of gas molecules
B. directly proportional to the vibrational K.E of gas molecules
C. directly proportional to the average translational K.E.of gas molecules
D. directly proportional to the P.E. of gas molecules
19 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
20 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
21 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
22 The efficiency of diesel engine is
A. 25%
B. 25 - 30%
C. 35%
D. 35 - 40%
23 Efficiency of carnot engine is independent of the
A. temperature of sink
B. temperature of source
C. nature of the working substances
D. none of them
24 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
25 The only significant motion possessed by the mono-atomic gas represented is:
A. Translatory
B. Rotatory
C. Vibratory
D. None of these
26 Gas constant per molecule is called:
A. Universal gas constant
B. Stefen's constant
C. Boltzmann constant
D. Gravitation constant
27 Average KE of a gas molecule has:
A. Direct relation with absolute temperature and inverse relation with pressure
B. Direction relation with both absolute temperature and pressure
C. Inverse relation with both absolute temperature and pressure
D. None of these
28 In case of an ideal gas, the P.E associated with its molecule is
A. maximum
B. zero
C. minimum
D. not fixed
29 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
30 Carnot heat engine only used
A. isothermal processes
B. adiabatic processes
C. both of them
D. none of them

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