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

A diatomic gas molecule has

Question # 2

In the study of thermodynamics, which gas is considered as the working substance

Question # 3

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 # 4

First law of thermodynamic is special case of

Question # 5

First law of thermodynamics is consequence of conservation of

Question # 6

Rice takes longest to cook

Question # 7

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

Question # 8

A gas which strictly obeys the gas laws under all conditions of temperature and pressure is called:

Question # 9

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

Question # 10

In an adiabatic process the work is done at the expense of the

Question # 11

At constant temperature, on increasing the pressure of a gas by 5%, its volume. The final temperature of the gas will be

Question # 12

Which of the following is not thermo dynamical function?

Question # 13

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

Question # 14

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

Question # 15

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

Question # 16

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

Question # 17

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

Question # 18

Real gases strictly obey gas law at:

Question # 19

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

Question # 20

Internal energy is the sum of all the forms of

Question # 21

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

Question # 22

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

Question # 23

The ideal gas law is

Question # 24

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

Question # 25

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

Question # 26

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

Question # 27

Truth of kinetic energy is confirmed by:

Question # 28

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

Question # 29

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

Question # 30

The curve representing an isothermal process is called

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Sr.# Question Answer
1 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
A. 0°C
B. 10°C
C. 17°C
D. 20°C
2 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
3 Absolute temperature can be calculated by
A. Means squares velocity
B. Motion of the molecule
C. Both A and B
D. None of these
4 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
5 When two objects are rubbed together, their internal energy
A. remains same
B. decreases
C. remains the same then decreases
D. increases
6 Heat travels through vacuum by
A. Conduction
B. Convection
C. Radiation
D. Both A and B
7 The state in which ice, water and vapour coexists in equilibrium is called
A. zero degree celsius
B. zero degree fahrenheit
C. absolute zero
D. 373 K
8 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
9 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
10 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
11 An isochoric process is one which take place at
A. Constant internal energy
B. Constant entropy
C. Constant volume
D. Constant pressure
12 Triple point of water is
A. 273.16°F
B. 372.16K
C. 273.16°F
D. 273.16
13 The temperature of gas is produced by
A. At potential energy of its molecules
B. The kinetic energy of its molecules
C. The attractive force between its molecules
D. The repulsive force between its molecules
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 Generally a temperature scale is established by
A. one fixed point
B. two fixed point
C. three fixed point
D. four fixed point
16 The volume of universal gas constant R is:
A. 8.314 J/K mole K
B. 8314 J/K mole K
C. 8.314 J/mole K
D. None of these
17 We cannot utilize the heat contents of oceans and atmosphere because
A. there is no reservoir at the same temperature
B. there is no reservoir at the temperature lower than any one of two
C. there is no reservoir at the temperature higher than any one of two
D. none of them
18 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
19 While deriving the equation for pressure of a gas we consider the
A. rotational motion of molecules
B. vibrational motion of molecules
C. linear motion of molecules
D. all of them
20 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
21 R.M.S velocity of a particle is V at pressure P. If pressure increases by two times, then R.M.S velocity becomes
A. 2V
B. 3V
C. 0.5V
D. V
22 Which of the following does not have the same units:
A. Work
B. Heat
C. Kinetic energy
D. Power
23 The curve representing an isothermal process is called
A. adiabat
B. isotherm
C. fixed temperature
D. none of them
24 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
25 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
26 Good absorbers of heat are
A. Poor emitters
B. Non emitters
C. Good emitters
D. Highly polarized
27 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
28 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
29 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
30 The number of translation degress of freedom for a diatomic gas is
A. 2
B. 3
C. 5
D. 6

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