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 earliest heat engine was

Question # 2

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

Question # 3

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

Question # 4

A diatomic gas molecule has

Question # 5

Amount of heat required to raise the temperature of a body through 1 K is called its

Question # 6

The internal energy of an ideal gas system is generally the

Question # 7

A real gas can be approximated to an ideal gas at

Question # 8

Hotness and coldness of an object is represented in terms:

Question # 9

The unit of thermodynamical scale is

Question # 10

Absolute zero is considered as that temperature at which:

Question # 11

The value of E0in coulomb's law is:

Question # 12

Which of the following is not thermo dynamical function?

Question # 13

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 # 14

According to kinetic theory of gases, molecules of a gas behave like

Question # 15

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

Question # 16

In thermodynamics, internal energy is the function of

Question # 17

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

Question # 18

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

Question # 19

The bicycle pump provides a good example of

Question # 20

The absolute temperature of the tripple point of water is

Question # 21

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

Question # 22

One mole of any substance contain

Question # 23

If the formula PV = nRT, n denotes:

Question # 24

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

Question # 25

A reversible cycle is the one in which

Question # 26

We cannot utilize the heat contents of oceans and atmosphere because

Question # 27

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

Question # 28

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

Question # 29

Triple point of water is

Question # 30

In the theory of dimensional analysis, heat may be properly represented by:

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Sr.# Question Answer
1 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
2 A real gas can be approximated to an ideal gas at
A. Low density
B. High pressure
C. High density
D. Low temperature
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 Specific heat at constant pressure is greater than the specific heat at constant volume because
A. Heat is used up to increase temperature at constant pressure
B. Heat is used by gas for expansions purposes at constant pressure
C. Heat is use dup to increase internal energy
D. The above statement is invalid
5 Maximum density of H2O is at the temperature
A. 32°F
B. 39.2°F
C. 42°F
D. 4°F
6 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
7 If the distance between two charges is doubled, the force between them will become:
A. Double
B. Half
C. Three times
D. One fourth
8 Rate of diffusion is
A. Faster in solids than in liquids and gases
B. Faster in liquids than in solids and gases
C. Equal to solids, liquids and gases
D. Faster in gases than in liquids and solids
9 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 %
10 Since the absolute scale is independent of the property of the working substance, hence, can be applied at
A. very high temperature
B. very low temperature
C. any one of them
D. none of them
11 A process which can be retraced in exactly reverse order, without producing any change in the surroundings is called
A. reversible process
B. irreversible process
C. any one of them
D. none of them
12 Absolute temperature can be calculated by
A. Means squares velocity
B. Motion of the molecule
C. Both A and B
D. None of these
13 The disorder in the system increases due to the
A. removal of heat
B. addition of heat
C. removal or addition of heat
D. none of them
14 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
15 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
16 The motion of molecules in gases is:
A. Orderly
B. Random
C. Circular
D. All of these
17 In the study of thermodynamics, which gas is considered as the working substance
A. real gas
B. ideal gas
C. any gas may be ideal or real
D. none of them
18 If the ratio of densities of two gases is 1:4, then the ratio of their rates of diffusion into one another is
A. 2 : 1
B. 4 : 1
C. 1 : 4
D. 3 : 4
19 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
20 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
21 The earliest heat engine was
A. petrol engine
B. diesel engine
C. electric engine
D. steam engine
22
During the whole carnot cycle
A. Thermal equilibrium is maintained
B. mechanical equilibrium is maintained
C. both the thermal and mechanical equilibriumis maintained
D. both the thermal and mechanical equilibrium is not maintained
23 The number of translation degress of freedom for a diatomic gas is
A. 2
B. 3
C. 5
D. 6
24 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
25 On the exaust stroke, the outlet values opens. The residual gases are expelled and piston moves
A. outwards
B. inwards
C. in either way
D. none of these
26 Which of the following does not have the same units:
A. Work
B. Heat
C. Kinetic energy
D. Power
27 Generally a temperature scale is established by
A. one fixed point
B. two fixed point
C. three fixed point
D. four fixed point
28 An isochoric process is one which take place at
A. Constant internal energy
B. Constant entropy
C. Constant volume
D. Constant pressure
29 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
30 The ideal gas law is
A. P = nRT
B. V = nRT
C. PV =RT
D. PV =nRT

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