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 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 # 2

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

Question # 3

The volume of universal gas constant R is:

Question # 4

In case of an ideal gas, the P.E associated with its molecule is

Question # 5

Which quantity is important in stating the entropy of the system

Question # 6

In the formula P = N0KT, N0denotes:

Question # 7

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

Question # 8

Absolute zero is considered as that temperature at which:

Question # 9

A real gas can be approximated to an ideal gas at

Question # 10

A typical four stroke petrol engine undergoes how many successive processes in each cycle

Question # 11

The temperature of gas is produced by

Question # 12

A heat engine is that which converts

Question # 13

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

Question # 14

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

Question # 15

Which of the following is not an example of adiabatic process

Question # 16

Pressure applied at any point of gas at rest is transmitted equally to all parts of the gas. This is the statement of:

Question # 17

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

Question # 18

A process in which no heat enters or leaves the system is called

Question # 19

The pressure exerted by the gas is

Question # 20

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

Question # 21

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

Question # 22

Carnot heat engine only used

Question # 23

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

Question # 24

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 # 25

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

Question # 26

A process is a reversible process, if the entropy of the system

Question # 27

Internal energy is the sum of all the forms of

Question # 28

Average KE of a gas molecule has:

Question # 29

The temperature scale approved in SI units is:

Question # 30

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

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Sr.# Question Answer
1 Melting point of ice
A. Increases with increasing pressure
B. Decreases with increasing pressure
C. Is independent of pressure
D. Is proportional to pressure
2 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
3 A real gas can be approximated to an ideal gas at
A. Low density
B. High pressure
C. High density
D. Low temperature
4 If the distance between two charges is doubled, the force between them will become:
A. Double
B. Half
C. Three times
D. One fourth
5 Energy gas behaves like an ideal gast at
A. High temperature and low pressure
B. Low temperature and high pressure
C. Both A and B
D. None
6 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
7 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
8 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
9 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
A. R/2
B. P
C. 2P
D. Depending on the relative mass of the gases
10 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
11 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
12 The absolute temperature of the tripple point of water is
A. 100°C
B. 4°C
C. 373 K
D. 273.16 K
13 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
14 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
15 The earliest heat engine was
A. petrol engine
B. diesel engine
C. electric engine
D. steam engine
16 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
17 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
18 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
19 A diatomic gas molecule has
A. translational energy
B. rotaional energy
C. vibrational energy
D. all of them
20 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
21 The concept of entropy was introduced into the study of thermodynamics in
A. 1856
B. 1865
C. 1656
D. 1685
22 Boyle's law is applicable in
A. Isochoric process
B. Isothermal process
C. Isobaric process
D. Isotonic process
23 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
24 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
A. second law thermodynamics
B. first law of thermodynamics
C. third law of thermodynamics
D. none of them
25 Carnot heat engine only used
A. isothermal processes
B. adiabatic processes
C. both of them
D. none of them
26 In the study of thermodynamics, which gas is considered as the working substance
A. real gas
B. ideal gas
C. any gas may be ideal or real
D. none of them
27 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
28 Tick the correct pair when M denotes the molecular mass and other symbols carry usual meanings:
A. N = nNAm = MNA
B. n = N NA, M = mNA
C. M = NA/N , NA= m/n
D. N = nNA, M = mNA
29 Good absorbers of heat are
A. Poor emitters
B. Non emitters
C. Good emitters
D. Highly polarized
30 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

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