| 1 |
A process is a reversible process, if the entropy of the system
|
A. increases
B. decreases
C. remains constant
D. none of them
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| 2 |
At the constant temperature, if the value of a given mass of a gas is double, then the density of gas becomes:
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A. Double
B. Remains constant
C. Half
D. None of these
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| 3 |
When heat is removed from the system
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A. negative
B. positive
C. zero
D. any one of them
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| 4 |
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:
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A. Force
B. Density
C. Work done
D. Pressure
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| 5 |
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
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A. 0 J
B. 2 J
C. 5 J
D. 10 J
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| 6 |
Tick the correct pair when M denotes the molecular mass and other symbols carry usual meanings:
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A. N = nNAm = MNA
B. n = N NA, M = mNA
C. M = NA/N , NA= m/n
D. N = nNA, M = mNA
|
| 7 |
For the working of a heat engine, there must be
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A. a source of heat at high temperature
B. a sink at low temperature
C. both of them
D. none of them
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| 8 |
In thermodynamics, internal energy is the function of
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A. temperature
B. pressure
C. state
D. none of them
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| 9 |
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
|
| 10 |
Brownian motion increases due to
|
A. Increase in size of Brownian particle
B. Increase in temperature of medium
C. Increase in density of medium
D. Increase in viscosity of medium
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| 11 |
While deriving the equation for pressure of a gas we consider the
|
A. rotational motion of molecules
B. vibrational motion of molecules
C. linear motion of molecules
D. all of them
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| 12 |
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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| 13 |
Truth of kinetic energy is confirmed by:
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A. Diffusion of gases
B. Brownian motion
C. Both A and B
D. None of these
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| 14 |
In an ideal gas, the molecules have:
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A. Kinetic energy only
B. Potential energy only
C. Both KE and PE
D. None of these
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| 15 |
If the formula PV = nRT, n denotes:
|
A. Number of molecules per unit volume
B. Number of moles
C. Number of molecules
D. None of these
|
| 16 |
A diatomic gas molecule has
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A. translational energy
B. rotaional energy
C. vibrational energy
D. all of them
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| 17 |
The earliest heat engine was
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A. petrol engine
B. diesel engine
C. electric engine
D. steam engine
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| 18 |
The highest efficiency of a heat engine whose low temperature is 17°C and the high temperature is 200°C is
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A. 70%
B. 100%
C. 35%
D. 38%
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| 19 |
On colliding in a closed container, the gas molecules
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A. Transfer momentum to the walls
B. Momentum becomes zero
C. Move in opposite directions
D. Perform Brownian motion
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| 20 |
Since the absolute scale is independent of the property of the working substance, hence, can be applied at
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A. very high temperature
B. very low temperature
C. any one of them
D. none of them
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| 21 |
An isochoric process is one which take place at
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A. Constant internal energy
B. Constant entropy
C. Constant volume
D. Constant pressure
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| 22 |
The only significant motion possessed by the mono-atomic gas represented is:
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A. Translatory
B. Rotatory
C. Vibratory
D. None of these
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| 23 |
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
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A. R/2
B. P
C. 2P
D. Depending on the relative mass of the gases
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| 24 |
One kilogram of different substances contain
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A. same number of molecules
B. different number of molecules
C. may be same or different
D. none of them
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| 25 |
A process which can be retraced in exactly reverse order, without producing any change in the surroundings is called
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A. reversible process
B. irreversible process
C. any one of them
D. none of them
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| 26 |
The motion of molecules in gases is:
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A. Orderly
B. Random
C. Circular
D. All of these
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| 27 |
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
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| 28 |
Generally a temperature scale is established by using certain physical properties of a material which varies
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A. nonlinearly with temperature
B. linearly with temperature
C. either of them
D. none of them
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| 29 |
No spark plug is needed in
|
A. petrol engine
B. diesel engine
C. both of them
D. none of them
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| 30 |
Which of the following is not thermo dynamical function?
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A. Enthalpy
B. Work done
C. Gibb's energy
D. Internal energy
|