ECAT Pre General Science Physics Chapter 11 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 11 Heat & Thermodynamics

Try The MCQ's Test For ECAT Pre General Science Physics Chapter 11 Heat & Thermodynamics

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ECAT Pre General Science Physics Chapter 11 Heat & Thermodynamics

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Question # 1

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

Question # 2

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

Question # 3

Absolute zero is considered as that temperature at which:

Question # 4

The unit of thermodynamical scale is

Question # 5

At absolute temperature, the kinetic energy of the molecules

Question # 6

The only significant motion possessed by the mono-atomic gas represented is:

Question # 7

If the formula PV = nRT, n denotes:

Question # 8

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 # 9

At constant temperature, if the density of the gas is increased, its pressure will:

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 state in which ice, water and vapour coexists in equilibrium is called

Question # 12

What temperature is the same on Celsius scale as well as on Fahrenheit scale?

Question # 13

Rate of diffusion is

Question # 14

10 c.c. each of oxygen and hydrogen are kept in separate flasks. Then which of the following relations is correct?

Question # 15

The nature of thermal radiation is similar to:

Question # 16

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 # 17

When heat is added into the system then change in entropy is

Question # 18

In which process the condition for the application of Boyle's law on the gas is fulfilled

Question # 19

First law of thermodynamic is special case of

Question # 20

A carnot cycle consists of

Question # 21

The efficiency of diesel engine is

Question # 22

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

Question # 23

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 # 24

Adiabatic change occurs when the gas

Question # 25

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

Question # 26

In an adiabatic expansion, the temperature of the gas

Question # 27

The disorder in the system increases due to the

Question # 28

Hotness and coldness of an object is represented in terms:

Question # 29

Sadi carnot described an ideal heat engine in

Question # 30

The earliest heat engine was

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Sr.# Question Answer
1 The curve representing an isothermal process is called
A. adiabat
B. isotherm
C. fixed temperature
D. none of them
2 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
3 The example of irreversible process is
A. slowly liquification
B. slowly evaporation
C. an explosion
D. all of them
4 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
5 The relationship between Boltzmann constant k with R and NAis given as:
A. k = RNA
B. k =R/NA
C. k = NR/NA
D. None of these
6 The efficiency of diesel engine is
A. 25%
B. 25 - 30%
C. 35%
D. 35 - 40%
7 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
8 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
9 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
10 The ideal gas law is
A. P = nRT
B. V = nRT
C. PV =RT
D. PV =nRT
11 At constant temperature, if the density of the gas is increased, its pressure will:
A. One kg of a substance
B. Unit volume of a substance
C. One mole of a substance
D. None of these
12 Adiabatic change occurs when the gas
A. expands
B. compressed
C. expands or compressed
D. expands or compressed rapidly
13 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
14 The work done on the system by the environment is considered as
A. positive
B. negative
C. zero
D. any one of them
15 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
16 A diatomic gas molecule has
A. translational energy
B. rotaional energy
C. vibrational energy
D. all of them
17 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
18 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
19 For the working of a heat engine, there must be
A. a source of heat at high temperature
B. a sink at low temperature
C. both of them
D. none of them
20 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
21 The internal energy of an ideal gas system is generally the
A. translational K.E of molecules
B. vibrational K.E of molecules
C. rotational K.E of molecules
D. all of them
22 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
23 When heat is added into the system then change in entropy is
A. negative
B. positive
C. zero
D. any one of them
24 The temperature scale approved in SI units is:
A. Celsius scale
B. Kelvin scale
C. Fehrenheit scale
D. None of these
25 The rate of change of momentum of a molecule is equal to:
A. Pressure
B. Work
C. Density
D. Force
26 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
27 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
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 The earliest heat engine was
A. petrol engine
B. diesel engine
C. electric engine
D. steam engine
30 When heat is removed from the system
A. negative
B. positive
C. zero
D. any one of them

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