| 1 |
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
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| 2 |
If the formula PV = nRT, n denotes:
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A. Number of molecules per unit volume
B. Number of moles
C. Number of molecules
D. None of these
|
| 3 |
When heat is removed from the system
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A. negative
B. positive
C. zero
D. any one of them
|
| 4 |
The heat required to raise the temperature of one mole of the substance through 1 K is called
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A. heat capacity
B. specific heat capacity
C. molar specific heat
D. all of them
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| 5 |
The absolute temperature for an ideal gas is
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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
|
| 6 |
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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| 7 |
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
|
| 8 |
Triple point of water is
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A. 273.16°F
B. 372.16K
C. 273.16°F
D. 273.16
|
| 9 |
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
|
| 10 |
In case of an ideal gas, the P.E associated with its molecule is
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A. maximum
B. zero
C. minimum
D. not fixed
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| 11 |
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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| 12 |
The internal energy of a system does not depend upon the
|
A. initial state of the system
B. final state of the system
C. path
D. none of them
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| 13 |
Efficiency of carnot engine is independent of the
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A. temperature of sink
B. temperature of source
C. nature of the working substances
D. none of them
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| 14 |
Which of the following is a state variable
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A. entropy
B. pressure
C. volume
D. all of them
|
| 15 |
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
|
| 16 |
Adiabatic change occurs when the gas
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A. expands
B. compressed
C. expands or compressed
D. expands or compressed rapidly
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| 17 |
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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| 18 |
At constant volume temperature is increased. Then
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A. Collision on walls will be less
B. Number of collisions per unit time will increase
C. Collision will be in straight lines
D. Collision will not change
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| 19 |
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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| 20 |
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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| 21 |
If N is the total number of molecules and V is the volume of the container, then the expression for the pressure of gas is
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A. P=P/V<1/2mv2>
B. P=2N/V<1/2mv2>
C. P=2/3N/V<1/2mv2>
D. P=2/3N/V<mv2>
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| 22 |
In an adiabatic expansion, the temperature of the gas
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A. increases
B. becomes zero
C. decreases
D. decreases rapidly
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| 23 |
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
|
A. 1 : 2
B. 2 : 3
C. 3 : 4
D. 8 : 9
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| 24 |
Rate of diffusion is
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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
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| 25 |
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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| 26 |
First law of thermodynamics is consequence of conservation of
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A. Work
B. Energy
C. Heat
D. All of these
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| 27 |
The work done on the system by the environment is considered as
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A. positive
B. negative
C. zero
D. any one of them
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| 28 |
The number of translation degress of freedom for a diatomic gas is
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A. 2
B. 3
C. 5
D. 6
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| 29 |
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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| 30 |
The rate of change of momentum of a molecule is equal to:
|
A. Pressure
B. Work
C. Density
D. Force
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