| 1 |
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
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| 2 |
When the temperature of source and sink of a heat engine become equal entropy change will be
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A. Zero
B. Max
C. Min
D. -ve
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| 3 |
For making cooking utensils, which of the following pairs of properties is most suited?
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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
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| 4 |
If a molecule with momentum mv strikes a wall and rebound then the change in momentum will be:
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A. -2 mv
B. Zero
C. 2 mv
D. mv
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| 5 |
Electromagnetic waves emitted by hot bodies are called:
|
A. Photoelectrons
B. Alpha rays
C. Thermal radiation
D. None of these
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| 6 |
The length of a metallic rod is 5 meter at 100°C. The coefficient of cubical expansion of the metal will be
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A. 2.0 x 10-5/°C
B. 4.0x10-5/°C
C. 6.0x10-5/°C
D. 2.33x10-5/°C
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| 7 |
In the formula P = N0KT, N0denotes:
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A. Number of molecules per unit per volume
B. Number of moles
C. Number of molecules
D. None of these
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| 8 |
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 %
|
| 9 |
In an adiabatic process the work is done at the expense of the
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A. energy supplied to the system
B. energy gained from the surroundings
C. internal energy
D. none of them
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| 10 |
Real gases strictly obey gas law at:
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A. High pressure and low temperatures
B. Low pressures and high temperatures
C. High pressures and high temperatures
D. None of these
|
| 11 |
The work done by the system on its environment is considered as
|
A. positive
B. negative
C. zero
D. any one of them
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| 12 |
A succession of events which bring the system back to its initial condition is called
|
A. reversible process
B. irreversible process
C. a cycle
D. none of them
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| 13 |
The curve representing an isothermal process is called
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A. adiabat
B. isotherm
C. fixed temperature
D. none of them
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| 14 |
A gas is compressed adiabatically till its temperature is double. The ratio of its final volume to initial volume will be
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A. 1/2
B. More than 1/2
C. Less than 1/2
D. Between 1 and 2
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| 15 |
If the volume of the gas is to be increased by 4 times, then
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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
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| 16 |
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
|
| 17 |
Which of the following is not an example of adiabatic process
|
A. the rapid escape of air from a burst type
B. the rapid expansion and compression of air through which a sound wave is passing
C. cloud formation in the atmosphere
D. none of them
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| 18 |
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
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A. second law thermodynamics
B. first law of thermodynamics
C. third law of thermodynamics
D. none of them
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| 19 |
Internal energy is the sum of all the forms of
|
A. K.E
B. P.E
C. both of them
D. none of them
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| 20 |
The behaviour of gases is well accounted by the kinetic theory based on
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A. microscopic approach
B. macroscopic approach
C. both of them
D. none of them
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| 21 |
The disorder in the system increases due to the
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A. removal of heat
B. addition of heat
C. removal or addition of heat
D. none of them
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| 22 |
We can express the work in term of
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A. directly measurable variables
B. indirectly measurable variables
C. either of them
D. both of them
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| 23 |
At O° K which of the following properties of a gas will be zero?
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A. Kinetic energy
B. Potential energy
C. Vibrational energy
D. Density
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| 24 |
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
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| 25 |
At absolute temperature, the kinetic energy of the molecules
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A. Becomes zero
B. Becomes maximum
C. Becomes minimum
D. Remain constant
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| 26 |
The value of E0in coulomb's law is:
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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
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| 27 |
A reversible cycle is the one in which
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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
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| 28 |
When heat is added into the system then change in entropy is
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A. negative
B. positive
C. zero
D. any one of them
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| 29 |
Pressure exerted by a gas is
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A. Independent of density of the gas
B. Inversely proportional to the density of the gas
C. Directly proportional to the square of the density of the gas
D. Directly proportional to the density of the gas
|
| 30 |
On the power stroke, a spark fires the mixtures causing a rapid increase in pressure and temperature and the burning mixture expands
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A. adiabatically
B. isothermally
C. isochorically
D. isobarically
|