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

Question # 2

Absolute zero is considered as that temperature at which:

Question # 3

R.M.S velocity of a particle is V at pressure P. If pressure increases by two times, then R.M.S velocity becomes

Question # 4

An isochoric process is one which take place at

Question # 5

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

Question # 6

The value of E0in coulomb's law is:

Question # 7

Energy gas behaves like an ideal gast at

Question # 8

The heat required to raise the temperature of one mole of the substance through 1 K is called

Question # 9

Internal energy is the sum of all the forms of

Question # 10

The ideal gas law is

Question # 11

A carnot cycle consists of

Question # 12

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

Question # 13

Generally a temperature scale is established by

Question # 14

The efficiency of petrol engine is usually not more than 25% to 30% because of

Question # 15

Triple point of water is

Question # 16

A heat engine is that which converts

Question # 17

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

Question # 18

In an adiabatic expansion, the temperature of the gas

Question # 19

When two objects come to common temperature, the body is said to be in:

Question # 20

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

Question # 21

In a heat engine, heat is supplied by the

Question # 22

On the power stroke, a spark fires the mixtures causing a rapid increase in pressure and temperature and the burning mixture expands

Question # 23

Which of the following does not have the same units:

Question # 24

Specific heat at constant pressure is greater than the specific heat at constant volume because

Question # 25

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

Question # 26

The internal energy of an ideal gas system is generally the

Question # 27

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

Question # 28

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

Question # 29

Real gases strictly obey gas law at:

Question # 30

At what temperature the adiabatic change is equivalent to the isothermal change?

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Sr.# Question Answer
1 The product of the pressure and volume of an ideal gas is
A. A constant
B. Approximately equal to the universal gas constant
C. Directly proportional to its temperature
D. Inversely proportional to its temperature
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 Sadi carnot described an ideal heat engine in
A. 1820
B. 1840
C. 1860
D. 1880
4 Melting point of ice
A. Increases with increasing pressure
B. Decreases with increasing pressure
C. Is independent of pressure
D. Is proportional to pressure
5 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
6 The only significant motion possessed by the mono-atomic gas represented is:
A. Translatory
B. Rotatory
C. Vibratory
D. None of these
7 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
8 The motion of molecules in gases is:
A. Orderly
B. Random
C. Circular
D. All of these
9 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
10 Which quantity is important in stating the entropy of the system
A. initial entropy
B. final entropy
C. change in entropy
D. none of them
11 If the distance between two charges is doubled, the force between them will become:
A. Double
B. Half
C. Three times
D. One fourth
12 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
13 The value of E0in coulomb's law is:
A. 9 x 109Nm2C-2
B. 8.85 x 10-12C2N-1m-2
C. 8.85 x 10-12Nm2C-2
D. 9 x 109C2N-1m-2
14 We can express the work in term of
A. directly measurable variables
B. indirectly measurable variables
C. either of them
D. both of them
15 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
A. 300°C
B. 573°C
C. 600°C
D. 743°C
16 Absolute temperature can be calculated by
A. Means squares velocity
B. Motion of the molecule
C. Both A and B
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 The concept of entropy was introduced into the study of thermodynamics in
A. 1856
B. 1865
C. 1656
D. 1685
19 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
20 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
21 Which of the following is not an assumption of kinetic energy
A. a finite volume of gas consists of very large number of molecules
B. the gas molecules are in random motion
C. collision between the gas molecules are inelastic
D. the size of the gas molecules is much smaller than the separation between molecules
22 Internal energy is the sum of all the forms of
A. K.E
B. P.E
C. both of them
D. none of them
23 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
24 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
25 A succession of events which bring the system back to its initial condition is called
A. reversible process
B. irreversible process
C. a cycle
D. none of them
26 For making cooking utensils, which of the following pairs of properties is most suited?
A. Low specific heat and high conductivity
B. Low specific heat and low conductivity
C. High specific heat and high conductivity
D. High specific heat and low conductivity
27 The example of irreversible process is
A. slowly liquification
B. slowly evaporation
C. an explosion
D. all of them
28 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
29 In a heat engine, heat is supplied by the
A. cold reservoir
B. sink
C. hot reservoir
D. none of them
30 Which of the following does not have the same units:
A. Work
B. Heat
C. Kinetic energy
D. Power

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