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

Which of the following is not an assumption of kinetic energy

Question # 2

A heat engine is that which converts

Question # 3

If water in a closed bottle is taken up to the moon and opened, the water gets

Question # 4

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

Question # 5

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

Question # 6

On colliding in a closed container, the gas molecules

Question # 7

The example of reversible process is

Question # 8

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

Question # 9

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

Question # 10

Melting point of ice

Question # 11

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

Question # 12

Triple point of water is

Question # 13

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

Question # 14

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

Question # 15

Maximum density of H2O is at the temperature

Question # 16

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

Question # 17

If N is the total number of molecules and V is the volume of the container, then the expression for the pressure of gas is

Question # 18

When heat is removed from the system

Question # 19

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 # 20

We cannot utilize the heat contents of oceans and atmosphere because

Question # 21

Pressure may be define as _______ per second per unit area:

Question # 22

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

Question # 23

Electromagnetic waves emitted by hot bodies are called:

Question # 24

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

Question # 25

Truth of kinetic energy is confirmed by:

Question # 26

The behaviour of gases is well accounted by the kinetic theory based on

Question # 27

One mole of any substance contain

Question # 28

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

Question # 29

Generally a temperature scale is established by

Question # 30

According to kinetic theory of gases, molecules of a gas behave like

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Sr.# Question Answer
1 The earliest heat engine was
A. petrol engine
B. diesel engine
C. electric engine
D. steam engine
2 The efficiency of diesel engine is
A. 25%
B. 25 - 30%
C. 35%
D. 35 - 40%
3 The Boltzman constant has the value
A. 1.38 x 10-23JK-1
B. 1.28 x 10-23JK-1
C. 1.38 x 10-26JK-1
D. 1.28 x 10-26JK-1
4 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
5 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
6 Hotness and coldness of an object is represented in terms:
A. Heat
B. Temperature
C. Chemical energy
D. None of these
7 In the formula P = N0KT, N0denotes:
A. Number of molecules per unit per volume
B. Number of moles
C. Number of molecules
D. None of these
8 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
9 Which of the following is not thermo dynamical function?
A. Enthalpy
B. Work done
C. Gibb's energy
D. Internal energy
10 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
11 One kilogram of different substances contain
A. same number of molecules
B. different number of molecules
C. may be same or different
D. none of them
12 First law of thermodynamics tells us that heat energy can be converted into equivalent amount of work, but it is silent about
A. how heat is absorbed
B. how heat extracted
C. how this conversion takes place
D. none of them
13 An isochoric process is one which take place at
A. Constant internal energy
B. Constant entropy
C. Constant volume
D. Constant pressure
14 First law of thermodynamics is consequence of conservation of
A. Work
B. Energy
C. Heat
D. All of these
15 Heat required to raise the temperature of one mole of a gas through 1 K at constant pressure is called
A. heat capacity
B. specific heat capacity
C. specific heat at constant volume
D. specific heat at constant pressure
16 The work done by the system on its environment is considered as
A. positive
B. negative
C. zero
D. any one of them
17 The number of translation degress of freedom for a diatomic gas is
A. 2
B. 3
C. 5
D. 6
18 Electromagnetic waves emitted by hot bodies are called:
A. Photoelectrons
B. Alpha rays
C. Thermal radiation
D. None of these
19 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
20 Brownian motion increases due to
A. Increase in size of Brownian particle
B. Increase in temperature of medium
C. Increase in density of medium
D. Increase in viscosity of medium
21 No spark plug is needed in
A. petrol engine
B. diesel engine
C. both of them
D. none of them
22 Maximum density of H2O is at the temperature
A. 32°F
B. 39.2°F
C. 42°F
D. 4°F
23 Pressure of a gas at constant volume is proportion to
A. Total energy of gas
B. Average P.E to molecules
C. Average K.E of molecules
D. Total internal energy of gas
24 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
25 A process in which no heat enters or leaves the system is called
A. isochoric process
B. isothermal process
C. adiabatic process
D. none of them
26 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
27 If an amount of heat enters the system it could
A. decrease the internal energy
B. not change the internal energy
C. increase the internal energy
D. none of them
28 The concept of entropy was introduced into the study of thermodynamics in
A. 1856
B. 1865
C. 1656
D. 1685
29 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
30 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

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