| 1 |
If a liquid is heated in weightlessness, the heat is transmitted through
|
A. Conduction
B. Convection
C. Radiation
D. Neither, because the liquid cannot be heated in weightlessness
|
| 2 |
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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| 3 |
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
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| 4 |
Gas constant per molecule is called:
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A. Universal gas constant
B. Stefen's constant
C. Boltzmann constant
D. Gravitation constant
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| 5 |
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
|
A. -20°C
B. 6.67°C
C. 5°C
D. 0°C
|
| 6 |
A succession of events which bring the system back to its initial condition is called
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A. reversible process
B. irreversible process
C. a cycle
D. none of them
|
| 7 |
If an amount of heat enters the system it could
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A. decrease the internal energy
B. not change the internal energy
C. increase the internal energy
D. none of them
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| 8 |
If water in a closed bottle is taken up to the moon and opened, the water gets
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A. Freeze
B. Boiled
C. Dissociated into O2and H2
D. Evaporated
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| 9 |
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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| 10 |
The heat required to raise the temperature of one mole of the substance through 1 K is called
|
A. heat capacity
B. specific heat capacity
C. molar specific heat
D. all of them
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| 11 |
On a cold morning a metal surface will fell colder to touch than a wooden surface, because
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A. Metal has high specific heat
B. Metal has high thermal conductivity
C. Metal has low specific heat
D. Metal has low thermal conductivity
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| 12 |
Which quantity is important in stating the entropy of the system
|
A. initial entropy
B. final entropy
C. change in entropy
D. none of them
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| 13 |
10 c.c. each of oxygen and hydrogen are kept in separate flasks. Then which of the following relations is correct?
|
A. Each have same number of molecules
B. Don't have same number of molecules
C. Can't be predicted
D. None
|
| 14 |
Sadi carnot described an ideal heat engine in
|
A. 1820
B. 1840
C. 1860
D. 1880
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| 15 |
Energy gas behaves like an ideal gast at
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A. High temperature and low pressure
B. Low temperature and high pressure
C. Both A and B
D. None
|
| 16 |
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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| 17 |
According to the second law, which is must to produce work
|
A. a source contains a large amount of heat energy
B. two sources at the same temperature
C. two sources at the different temperatures
D. a source contains a small amount of energy
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| 18 |
The volume of a gas will be double of what it is at 0°C (pressure remaining constant) at
|
A. 546 K
B. 273 K
C. 546°C
D. 273°C
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| 19 |
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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| 20 |
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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| 21 |
On the compression stroke of the petrol engine, the inlet value is closed and the mixture is compressed
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A. adiabatically
B. isothermally
C. isochorcally
D. isobarically
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| 22 |
The ideal gas law is
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A. P = nRT
B. V = nRT
C. PV =RT
D. PV =nRT
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| 23 |
First law of thermodynamics tells us that heat energy can be converted into equivalent amount of work, but it is silent about
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A. how heat is absorbed
B. how heat extracted
C. how this conversion takes place
D. none of them
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| 24 |
Maximum density of H2O is at the temperature
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A. 32°F
B. 39.2°F
C. 42°F
D. 4°F
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| 25 |
In the study of thermodynamics, which gas is considered as the working substance
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A. real gas
B. ideal gas
C. any gas may be ideal or real
D. none of them
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| 26 |
Good absorbers of heat are
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A. Poor emitters
B. Non emitters
C. Good emitters
D. Highly polarized
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| 27 |
At constant volume temperature is increased. Then
|
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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| 28 |
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
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| 29 |
The basis to define a temperature scale that is independent of material properties is provided by
|
A. carbon cycle
B. nitrogen cycle
C. Carnot cycle
D. irreversible cycle
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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
|