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

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 # 2

When two objects are rubbed together, their internal energy

Question # 3

Carnot heat engine only used

Question # 4

Heat required to raise the temperature of one mole of a gas through 1 K at constant pressure is called

Question # 5

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

Question # 6

If a process cannot be retraced in the backward direction by reversing the controlling factors, it is

Question # 7

Average KE of a gas molecule has:

Question # 8

A gas is compressed adiabatically till its temperature is double. The ratio of its final volume to initial volume will be

Question # 9

If R is gas constant for 1 gram mole, Cpand Cvare specific heat for a solid then

Question # 10

Which of the following is not an assumption of kinetic energy

Question # 11

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

Question # 12

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

Question # 13

No spark plug is needed in

Question # 14

At absolute temperature, the kinetic energy of the molecules

Question # 15

Sadi carnot described an ideal heat engine in

Question # 16

If the ratio of densities of two gases is 1:4, then the ratio of their rates of diffusion into one another is

Question # 17

In an adiabatic expansion, the temperature of the gas

Question # 18

A process which can be retraced in exactly reverse order, without producing any change in the surroundings is called

Question # 19

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

Question # 20

Specific heat at constant pressure is greater than the specific heat at constant volume because

Question # 21

The temperature scale approved in SI units is:

Question # 22

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

Question # 23

The pressure exerted by the gas is

Question # 24

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

Question # 25

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

Question # 26

Internal energy is the sum of all the forms of

Question # 27

Which of the following is not thermo dynamical function?

Question # 28

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

Question # 29

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

Question # 30

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

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Sr.# Question Answer
1 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
2 Internal energy is the sum of all the forms of
A. K.E
B. P.E
C. both of them
D. none of them
3 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
4 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
5 The percentage of available heat energy converted into work by a diesel engine is roughly
A. 35 %`
B. 40 %
C. 35 - 40 %
D. 25 %
6 When two objects are rubbed together, their internal energy
A. remains same
B. decreases
C. remains the same then decreases
D. increases
7 10 c.c. each of oxygen and hydrogen are kept in separate flasks. Then which of the following relations is correct?
A. Each have same number of molecules
B. Don't have same number of molecules
C. Can't be predicted
D. None
8 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
9 Pressure of a gas at constant volume is proportion to
A. Total energy of gas
B. Average P.E to molecules
C. Average K.E of molecules
D. Total internal energy of gas
10 In case of an ideal gas, the P.E associated with its molecule is
A. maximum
B. zero
C. minimum
D. not fixed
11 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
12 Which of the following is a state variable
A. entropy
B. pressure
C. volume
D. all of them
13 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
14 In thermodynamics, internal energy is the function of
A. temperature
B. pressure
C. state
D. none of them
15 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
16 The curve representing an isothermal process is called
A. adiabat
B. isotherm
C. fixed temperature
D. none of them
17 The value of E0in coulomb's law is:
A. 9 x 109Nm2C-2
B. 8.85 x 10-12C2N-1m-2
C. 8.85 x 10-12Nm2C-2
D. 9 x 109C2N-1m-2
18 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
19 The nature of thermal radiation is similar to:
A. Ultraviolet rays
B. Light rays
C. Both of them
D. None of these
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 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
22 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
23 We can express the work in term of
A. directly measurable variables
B. indirectly measurable variables
C. either of them
D. both of them
24 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
25 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
26 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
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 On the power stroke, a spark fires the mixtures causing a rapid increase in pressure and temperature and the burning mixture expands
A. adiabatically
B. isothermally
C. isochorically
D. isobarically
29 One kilogram of different substances contain
A. same number of molecules
B. different number of molecules
C. may be same or different
D. none of them
30 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

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