| 1 |
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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| 2 |
The second law of thermodynamics is concerned with the circumstances in which
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A. heat can be converted into work
B. direction of flow of heat
C. none of them
D. both of them
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| 3 |
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
|
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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| 4 |
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 %
|
| 5 |
The state in which ice, water and vapour coexists in equilibrium is called
|
A. zero degree celsius
B. zero degree fahrenheit
C. absolute zero
D. 373 K
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| 6 |
Adiabatic change occurs when the gas
|
A. expands
B. compressed
C. expands or compressed
D. expands or compressed rapidly
|
| 7 |
Maximum density of H2O is at the temperature
|
A. 32°F
B. 39.2°F
C. 42°F
D. 4°F
|
| 8 |
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
|
| 9 |
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
|
| 10 |
The number of translation degress of freedom for a diatomic gas is
|
A. 2
B. 3
C. 5
D. 6
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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 kinetic energy of one molecule of a gas at normal temperature and pressure will be (k = 8.31 J/mole K) :
|
A. 1.7 x 103J
B. 10.2 x 103J
C. 3..4 x 103J
D. 6.8 x 103J
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| 13 |
In case of an ideal gas, the P.E associated with its molecule is
|
A. maximum
B. zero
C. minimum
D. not fixed
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| 14 |
When two objects come to common temperature, the body is said to be in:
|
A. Static equilibrium
B. Dynamic equilibrium
C. Thermal equilibrium
D. None of these
|
| 15 |
The rate of change of momentum of a molecule is equal to:
|
A. Pressure
B. Work
C. Density
D. Force
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| 16 |
While deriving equation of pressure by kinetic theory of gases, we take into account:
|
A. Only linear motion of molecules
B. Only rotational motion
C. Only vibratory motion
D. All of these
|
| 17 |
Generally a temperature scale is established by
|
A. one fixed point
B. two fixed point
C. three fixed point
D. four fixed point
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| 18 |
The earliest heat engine was
|
A. petrol engine
B. diesel engine
C. electric engine
D. steam engine
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| 19 |
R.M.S velocity of a particle is V at pressure P. If pressure increases by two times, then R.M.S velocity becomes
|
A. 2V
B. 3V
C. 0.5V
D. V
|
| 20 |
A typical four stroke petrol engine undergoes how many successive processes in each cycle
|
A. one
B. two
C. three
D. four
|
| 21 |
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
|
| 22 |
For the working of a heat engine, there must be
|
A. a source of heat at high temperature
B. a sink at low temperature
C. both of them
D. none of them
|
| 23 |
In an adiabatic process the work is done at the expense of the
|
A. energy supplied to the system
B. energy gained from the surroundings
C. internal energy
D. none of them
|
| 24 |
Which of the following is a state variable
|
A. entropy
B. pressure
C. volume
D. all of them
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| 25 |
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
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| 26 |
If R is gas constant for 1 gram mole, Cpand Cvare specific heat for a solid then
|
A. Cp- Cv= R
B. Cp- Cv < R
C. Cp- Cv = 0
D. Cp- Cv > R
|
| 27 |
First law of thermodynamic is special case of
|
A. Law of conservation of energy
B. Charle's law
C. Law of conservation of mass
D. Boyle's law
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| 28 |
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
|
| 29 |
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
|
| 30 |
The product of the pressure and volume of an ideal gas is
|
A. A constant
B. Approximately equal to the universal gas constant
C. Directly proportional to its temperature
D. Inversely proportional to its temperature
|