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 kinetic energy of one molecule of a gas at normal temperature and pressure will be (k = 8.31 J/mole K) :

Question # 2

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

Question # 3

The Boltzman constant has the value

Question # 4

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

Question # 5

The volume of universal gas constant R is:

Question # 6

Brownian motion increases due to

Question # 7

When the temperature of source and sink of a heat engine become equal entropy change will be

Question # 8

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

Question # 9

On the compression stroke of the petrol engine, the inlet value is closed and the mixture is compressed

Question # 10

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

Question # 11

The ideal gas law is

Question # 12

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

Question # 13

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

Question # 14

The absolute temperature of the tripple point of water is

Question # 15

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

Question # 16

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 # 17

Boyle's law is applicable in

Question # 18

Good absorbers of heat are

Question # 19

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

Question # 20

The motion of molecules in gases is:

Question # 21

The efficiency of carnot engine cannot be 100% or one unless cold reservoir is at

Question # 22

Rice takes longest to cook

Question # 23

First law of thermodynamics is consequence of conservation of

Question # 24

During the whole carnot cycle

Question # 25

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

Question # 26

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

Question # 27

Triple point of water is

Question # 28

On a cold morning a metal surface will fell colder to touch than a wooden surface, because

Question # 29

A carnot cycle consists of

Question # 30

Energy gas behaves like an ideal gast at

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Sr.# Question Answer
1 A gas which strictly obeys the gas laws under all conditions of temperature and pressure is called:
A. Ideal gas
B. Inert gas
C. Real gas
D. None of these
2 The temperature scale approved in SI units is:
A. Celsius scale
B. Kelvin scale
C. Fehrenheit scale
D. None of these
3 Electromagnetic waves emitted by hot bodies are called:
A. Photoelectrons
B. Alpha rays
C. Thermal radiation
D. None of these
4 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
5 Which of the following is a state variable
A. entropy
B. pressure
C. volume
D. all of them
6 What temperature is the same on Celsius scale as well as on Fahrenheit scale?
A. 32°C
B. -32°C
C. -40°C
D. -212°C
7 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
8 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
9 At absolute temperature, the kinetic energy of the molecules
A. Becomes zero
B. Becomes maximum
C. Becomes minimum
D. Remain constant
10 Triple point of water is
A. 273.16°F
B. 372.16K
C. 273.16°F
D. 273.16
11 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 %
12 The heat required to raise the temperature of one mole of the gas through 1 K at constant volume is called
A. heat capacity
B. specific heat capacity
C. molar specific heat
D. molar specific heat at constant volume
13 Generally a temperature scale is established by
A. one fixed point
B. two fixed point
C. three fixed point
D. four fixed point
14 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
15 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
16 An amount of water of mass 20 g at 0°C is mixed with 40 g of water at 10°C. Final temperature of mixture is
A. -20°C
B. 6.67°C
C. 5°C
D. 0°C
17 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
18 Amount of heat required to raise the temperature of a body through 1 K is called its
A. Specific heat
B. Water equivalent
C. Thermal capacity
D. Entropy
19 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
20 In an ideal gas, the molecules have:
A. Kinetic energy only
B. Potential energy only
C. Both KE and PE
D. None of these
21 If R is gas constant for 1 gram mole, Cpand Cvare specific heat for a solid then
A. Cp- Cv= R
B. Cp- Cv < R
C. Cp- Cv = 0
D. Cp- Cv > R
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 On colliding in a closed container, the gas molecules
A. Transfer momentum to the walls
B. Momentum becomes zero
C. Move in opposite directions
D. Perform Brownian motion
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 A gas is compressed adiabatically till its temperature is double. The ratio of its final volume to initial volume will be
A. 1/2
B. More than 1/2
C. Less than 1/2
D. Between 1 and 2
26 The number of translation degress of freedom for a diatomic gas is
A. 2
B. 3
C. 5
D. 6
27 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
28 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
29 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
30 At constant temperature, on increasing the pressure of a gas by 5%, its volume. The final temperature of the gas will be
A. 81 K
B. 355 K
C. 627 K
D. 627°C

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