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

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 # 2

The heat required to raise the temperature of one mole of the gas through 1 K at constant volume is called

Question # 3

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

Question # 4

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

Question # 5

A real gas can be approximated to an ideal gas at

Question # 6

The product of the pressure and volume of an ideal gas is

Question # 7

The internal energy of an ideal gas system is generally the

Question # 8

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

Question # 9

The heat required to raise the temperature of one mole of the substance through 1 K is called

Question # 10

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

Question # 11

The pressure of gas everywhere inside the vessel will be the same provided the gas is of

Question # 12

Two metal rods A and B have their initial lengths in the ratio 2 : 3 and coefficients of linear expansion in the ratio 4 : 3. When they are heated through same temperature difference the ratio of their linear expansion is

Question # 13

Absolute temperature can be calculated by

Question # 14

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

Question # 15

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

Question # 16

The Boltzman constant has the value

Question # 17

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

Question # 18

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

Question # 19

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

Question # 20

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

Question # 21

If denotes the total number of molecules in cubic vessel such that m is mass of each milecule and I is length of each side of vessel, then mN/I3gives the:

Question # 22

Pressure of a gas at constant volume is proportion to

Question # 23

In all natural processes where heat flows from one system to another, there is always a net

Question # 24

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

Question # 25

The absolute temperature for an ideal gas is

Question # 26

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

Question # 27

Average KE of a gas molecule has:

Question # 28

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 # 29

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

Question # 30

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

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Sr.# Question Answer
1 The product of the pressure and volume of an ideal gas is
A. A constant
B. Approximately equal to the universal gas constant
C. Directly proportional to its temperature
D. Inversely proportional to its temperature
2 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
3 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
4 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
5 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
6 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
7 If water in a closed bottle is taken up to the moon and opened, the water gets
A. Freeze
B. Boiled
C. Dissociated into O2and H2
D. Evaporated
8 At the constant temperature, if the value of a given mass of a gas is double, then the density of gas becomes:
A. Double
B. Remains constant
C. Half
D. None of these
9 In thermodynamics, internal energy is the function of
A. temperature
B. pressure
C. state
D. none of them
10 Generally a temperature scale is established by
A. one fixed point
B. two fixed point
C. three fixed point
D. four fixed point
11 When heat is removed from the system
A. negative
B. positive
C. zero
D. any one of them
12 The pressure of gas everywhere inside the vessel will be the same provided the gas is of
A. Non-uniform density
B. uniform density
C. high density
D. low density
13 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
14 No spark plug is needed in
A. petrol engine
B. diesel engine
C. both of them
D. none of them
15 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
16 According to kinetic theory of gases, molecules of a gas behave like
A. Inelastic spheres
B. Perfectly elastic rigid sphere
C. Perfectly elastic non-rigid spheres
D. Inelastic non-rigid spheres
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
A. second law thermodynamics
B. first law of thermodynamics
C. third law of thermodynamics
D. none of them
18 The percentage of available heat energy converted into work by a diesel engine is roughly
A. 35 %`
B. 40 %
C. 35 - 40 %
D. 25 %
19 The efficiency of petrol engine is usually not more than 25% to 30% because of
A. friction
B. heat losses
C. both of them
D. none of them
20 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
21 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
22 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
23 If a process cannot be retraced in the backward direction by reversing the controlling factors, it is
A. a reversible process
B. an irreversible process
C. any one of them
D. both of them
24 A typical four stroke petrol engine undergoes how many successive processes in each cycle
A. one
B. two
C. three
D. four
25 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
26 It is impossible to devise a processes which may convert heat, extracted from a single reservoir, entirely into work without leaving any change in the working system. This is the statement of
A. Clausius statement of second law
B. Kelvin'sstatement of second law
C. Clausius statement of first law
D. Kelvin's statement of first law
27 Carnot heat engine only used
A. isothermal processes
B. adiabatic processes
C. both of them
D. none of them
28 The work done by the system on its environment is considered as
A. positive
B. negative
C. zero
D. any one of them
29 When two objects are rubbed together, their internal energy
A. remains same
B. decreases
C. remains the same then decreases
D. increases
30 Which of the following is not an example of adiabatic process
A. the rapid escape of air from a burst type
B. the rapid expansion and compression of air through which a sound wave is passing
C. cloud formation in the atmosphere
D. none of them

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