ECAT Pre General Science Physics Chapter 11 MCQ Test With Answer

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 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 # 2

One mole of any substance contain

Question # 3

The volume of universal gas constant R is:

Question # 4

Carnot heat engine only used

Question # 5

The earliest heat engine was

Question # 6

While deriving equation of pressure by kinetic theory of gases, we take into account:

Question # 7

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

Question # 8

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

Question # 9

The example of reversible process is

Question # 10

The efficiency of diesel engine is

Question # 11

In thermodynamics, internal energy is the function of

Question # 12

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

Question # 13

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

Question # 14

In an ideal gas, the molecules have:

Question # 15

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

Question # 16

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 # 17

The absolute temperature of the tripple point of water is

Question # 18

Truth of kinetic energy is confirmed by:

Question # 19

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

Question # 20

While deriving the equation for pressure of a gas we consider the

Question # 21

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 # 22

Average KE of a gas molecule has:

Question # 23

The unit of thermodynamical scale is

Question # 24

The nature of thermal radiation is similar to:

Question # 25

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

Question # 26

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

Question # 27

The absolute temperature for an ideal gas is

Question # 28

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

Question # 29

The rate of change of momentum of a molecule is equal to:

Question # 30

The example of irreversible process is

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Sr.# Question Answer
1 The bicycle pump provides a good example of
A. first law of thermodynamics
B. second law of thermodynamics
C. third law of thermodynamics
D. none of them
2 Triple point of water is
A. 273.16°F
B. 372.16K
C. 273.16°F
D. 273.16
3 A real gas can be approximated to an ideal gas at
A. Low density
B. High pressure
C. High density
D. Low temperature
4 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
A. 1 : 2
B. 2 : 3
C. 3 : 4
D. 8 : 9
5 The curve representing an adiabatic process is called
A. isotherm
B. adiabat
C. adiable
D. none of them
6 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
7 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
8 An irreversible heat flow from a hot to cold substances of a system, causes the disorder to
A. decrease
B. remains the same
C. increase
D. any one of them
9 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
10 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
11 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:
A. Force
B. Density
C. Work done
D. Pressure
12 An isochoric process is one which take place at
A. Constant internal energy
B. Constant entropy
C. Constant volume
D. Constant pressure
13 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
14 We can express the work in term of
A. directly measurable variables
B. indirectly measurable variables
C. either of them
D. both of them
15 The rate of change of momentum of a molecule is equal to:
A. Pressure
B. Work
C. Density
D. Force
16 The temperature scale approved in SI units is:
A. Celsius scale
B. Kelvin scale
C. Fehrenheit scale
D. None of these
17 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
18 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
19 A reversible cycle is the one in which
A. some of the changes are reversible
B. all of the changes are reversible
C. all of the changes are irreversible
D. none of them
20 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
A. R/2
B. P
C. 2P
D. Depending on the relative mass of the gases
21 The highest efficiency of a heat engine whose low temperature is 17°C and the high temperature is 200°C is
A. 70%
B. 100%
C. 35%
D. 38%
22 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
23 Electromagnetic waves emitted by hot bodies are called:
A. Photoelectrons
B. Alpha rays
C. Thermal radiation
D. None of these
24 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
25 The ideal gas law is
A. P = nRT
B. V = nRT
C. PV =RT
D. PV =nRT
26 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
27 The percentage of available heat energy converted into work by a petrol engine is roughly
A. 35 %
B. 40 %
C. 35 to 40 %
D. 25 %
28 In the reverse process, the working substance passes through the same stages as in the direct process and
A. thermal effects at each stage are exactly reversed
B. mechanical effects at each stage are exactly reversed
C. thermal and mechanical effects at each stage remain the same
D. thermal and mechanical effects at each stage are exactly reversed
29 The percentage of available heat energy converted into work by a diesel engine is roughly
A. 35 %`
B. 40 %
C. 35 - 40 %
D. 25 %
30 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

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