| 1 |
The curve representing an adiabatic process is called
|
A. isotherm
B. adiabat
C. adiable
D. none of them
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| 2 |
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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| 3 |
In which process the condition for the application of Boyle's law on the gas is fulfilled
|
A. isochoric process
B. adiabatic process
C. isothermal process
D. none of them
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| 4 |
The internal energy of an ideal gas system is generally the
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A. translational K.E of molecules
B. vibrational K.E of molecules
C. rotational K.E of molecules
D. all of them
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| 5 |
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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| 6 |
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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| 7 |
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
|
| 8 |
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
|
| 9 |
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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| 10 |
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
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| 11 |
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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| 12 |
In all natural processes where heat flows from one system to another, there is always a net
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A. decrease in entropy
B. increase in entropy
C. decrease or increase in entropy
D. none of them
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| 13 |
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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| 14 |
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
|
| 15 |
A real gas can be approximated to an ideal gas at
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A. Low density
B. High pressure
C. High density
D. Low temperature
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| 16 |
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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| 17 |
In the theory of dimensional analysis, heat may be properly represented by:
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A. ML2T-2
B. MT-2
C. ML-1T-1
D. None of these
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| 18 |
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
|
| 19 |
The Boltzman constant has the value
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A. 1.38 x 10-23JK-1
B. 1.28 x 10-23JK-1
C. 1.38 x 10-26JK-1
D. 1.28 x 10-26JK-1
|
| 20 |
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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| 21 |
Two samples A and B of a gas initially of the same temperature and pressure are compressed from a volume V to a volume V/2 such that A is compressed isothermally and B adiabatically. The final pressure
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A. A greater than than of B
B. A is equal to that of B
C. A is less than that of B
D. A is twice the pressure of B
|
| 22 |
Melting point of ice
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A. Increases with increasing pressure
B. Decreases with increasing pressure
C. Is independent of pressure
D. Is proportional to pressure
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| 23 |
A gas which strictly obeys the gas laws under all conditions of temperature and pressure is called:
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A. Ideal gas
B. Inert gas
C. Real gas
D. None of these
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| 24 |
Amount of heat required to raise the temperature of a body through 1 K is called its
|
A. Specific heat
B. Water equivalent
C. Thermal capacity
D. Entropy
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| 25 |
Rice takes longest to cook
|
A. In a submarine 100 m below the surface of the sea
B. At sea level
C. At Murree
D. At Mount Everest
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| 26 |
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
|
| 27 |
First law of thermodynamics tells us that heat energy can be converted into equivalent amount of work, but it is silent about
|
A. how heat is absorbed
B. how heat extracted
C. how this conversion takes place
D. none of them
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| 28 |
The work done on the system by the environment is considered as
|
A. positive
B. negative
C. zero
D. any one of them
|
| 29 |
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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| 30 |
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
|