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

Brownian motion increases due to

Question # 2

The ideal gas law is

Question # 3

Hotness and coldness of an object is represented in terms:

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

Melting point of ice

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

We can express the work in term of

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

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

Question # 16

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

Question # 17

Internal energy is the sum of all the forms of

Question # 18

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 # 19

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 # 20

The work done by the system on its environment is considered as

Question # 21

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 # 22

Heat travels through vacuum by

Question # 23

Boyle's law is applicable in

Question # 24

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

Question # 25

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

Question # 26

The curve representing an isothermal process is called

Question # 27

On the power stroke, a spark fires the mixtures causing a rapid increase in pressure and temperature and the burning mixture expands

Question # 28

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

Question # 29

The volume of universal gas constant R is:

Question # 30

If the formula PV = nRT, n denotes:

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Sr.# Question Answer
1 A typical four stroke petrol engine undergoes how many successive processes in each cycle
A. one
B. two
C. three
D. four
2 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
3 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
4 The process which is carried out at constant temperature is known as
A. adiabatic process
B. isothermal process
C. isochoric process
D. none of them
5 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
6 Electromagnetic waves emitted by hot bodies are called:
A. Photoelectrons
B. Alpha rays
C. Thermal radiation
D. None of these
7 For making cooking utensils, which of the following pairs of properties is most suited?
A. Low specific heat and high conductivity
B. Low specific heat and low conductivity
C. High specific heat and high conductivity
D. High specific heat and low conductivity
8 Which of the following is not thermo dynamical function?
A. Enthalpy
B. Work done
C. Gibb's energy
D. Internal energy
9 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
10 A diatomic gas molecule has
A. translational energy
B. rotaional energy
C. vibrational energy
D. all of them
11 Maximum density of H2O is at the temperature
A. 32°F
B. 39.2°F
C. 42°F
D. 4°F
12 An isochoric process is one which take place at
A. Constant internal energy
B. Constant entropy
C. Constant volume
D. Constant pressure
13 Adiabatic change occurs when the gas
A. expands
B. compressed
C. expands or compressed
D. expands or compressed rapidly
14 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
15 At what temperature the adiabatic change is equivalent to the isothermal change?
A. Zero degree Celsius
B. Zero Kelvin
C. Critical temperature
D. Above critical temperature
16 In all natural processes where heat flows from one system to another, there is always a net
A. decrease in entropy
B. increase in entropy
C. decrease or increase in entropy
D. none of them
17 In a heat engine, heat is supplied by the
A. cold reservoir
B. sink
C. hot reservoir
D. none of them
18 The unit of thermodynamical scale is
A. centigrade
B. fahrenheit
C. kelvin
D. none of them
19 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
20 The motion of molecules in gases is:
A. Orderly
B. Random
C. Circular
D. All of these
21 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
22 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
A. 300°C
B. 573°C
C. 600°C
D. 743°C
23 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
24 The efficiency of carnot engine cannot be 100% or one unless cold reservoir is at
A. 100 K
B. 273 K
C. 0 K
D. -273 K
25 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
26 A gas is compressed adiabatically till its temperature is double. The ratio of its final volume to initial volume will be
A. 1/2
B. More than 1/2
C. Less than 1/2
D. Between 1 and 2
27 The rate of change of momentum of a molecule is equal to:
A. Pressure
B. Work
C. Density
D. Force
28 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
29 No spark plug is needed in
A. petrol engine
B. diesel engine
C. both of them
D. none of them
30 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

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