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 curve representing an isothermal process is called

Question # 2

The absolute temperature for an ideal gas is

Question # 3

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

Question # 4

Which of the following is not thermo dynamical function?

Question # 5

The disorder in the system increases due to the

Question # 6

Real gases strictly obey gas law at:

Question # 7

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

Question # 8

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 # 9

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

Question # 10

At the constant temperature, if the value of a given mass of a gas is double, then the density of gas becomes:

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

A succession of events which bring the system back to its initial condition is called

Question # 15

Internal energy is the sum of all the forms of

Question # 16

In the formula P = N0KT, N0denotes:

Question # 17

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 # 18

We cannot utilize the heat contents of oceans and atmosphere because

Question # 19

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

Question # 20

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

Question # 21

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

Question # 22

The value of E0in coulomb's law is:

Question # 23

Pressure exerted by a gas is

Question # 24

The example of irreversible process is

Question # 25

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

Question # 26

The bicycle pump provides a good example of

Question # 27

The unit of thermodynamical scale is

Question # 28

The motion of molecules in gases is:

Question # 29

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

Question # 30

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

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Sr.# Question Answer
1 The basis to define a temperature scale that is independent of material properties is provided by
A. carbon cycle
B. nitrogen cycle
C. Carnot cycle
D. irreversible cycle
2 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
3 At absolute temperature, the kinetic energy of the molecules
A. Becomes zero
B. Becomes maximum
C. Becomes minimum
D. Remain constant
4 The temperature scale approved in SI units is:
A. Celsius scale
B. Kelvin scale
C. Fehrenheit scale
D. None of these
5 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
6 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
7 Truth of kinetic energy is confirmed by:
A. Diffusion of gases
B. Brownian motion
C. Both A and B
D. None of these
8 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
9 The pressure exerted by the gas is
A. directly proportional to the P.E
B. inversely proportional to the P.E
C. inversely proportional to the K.E
D. directly proportional to the K.E
10 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
11 When two objects are rubbed together, their internal energy
A. remains same
B. decreases
C. remains the same then decreases
D. increases
12 The nature of thermal radiation is similar to:
A. Ultraviolet rays
B. Light rays
C. Both of them
D. None of these
13 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
14 On the compression stroke of the petrol engine, the inlet value is closed and the mixture is compressed
A. adiabatically
B. isothermally
C. isochorcally
D. isobarically
15 The internal energy of a system does not depend upon the
A. initial state of the system
B. final state of the system
C. path
D. none of them
16 Which of the following is a state variable
A. entropy
B. pressure
C. volume
D. all of them
17 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
18 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
19 If a liquid is heated in weightlessness, the heat is transmitted through
A. Conduction
B. Convection
C. Radiation
D. Neither, because the liquid cannot be heated in weightlessness
20 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
A. P=P/V<1/2mv2>
B. P=2N/V<1/2mv2>
C. P=2/3N/V<1/2mv2>
D. P=2/3N/V<mv2>
21 In which process the condition for the application of Boyle's law on the gas is fulfilled
A. isochoric process
B. adiabatic process
C. isothermal process
D. none of them
22 A carnot cycle consists of
A. One step
B. two step
C. three steps
D. four steps
23 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
24 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
25 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
26 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
27 The curve representing an adiabatic process is called
A. isotherm
B. adiabat
C. adiable
D. none of them
28 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
29 We can express the work in term of
A. directly measurable variables
B. indirectly measurable variables
C. either of them
D. both of them
30 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

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