| 1 |
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
|
A. R/2
B. P
C.2P
D. Depending on the relative mass of the gases
|
| 2 |
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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| 3 |
On the power stroke, a spark fires the mixtures causing a rapid increase in pressure and temperature and the burning mixture expands
|
A. adiabatically
B. isothermally
C.isochorically
D. isobarically
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| 4 |
The rate of change of momentum of a molecule is equal to:
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A. Pressure
B. Work
C.Density
D. Force
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| 5 |
The process which is carried out at constant temperature is known as
|
A. adiabatic process
B. isothermal process
C.isochoric process
D. none of them
|
| 6 |
In the reverse process, the working substance passes through the same stages as in the direct process and
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A. thermal effects at each stage are exactly reversed
B. mechanical effects at each stage are exactly reversed
C.thermal and mechanical effects at each stage remain the same
D. thermal and mechanical effects at each stage are exactly reversed
|
| 7 |
In the theory of dimensional analysis, heat may be properly represented by:
|
A. ML2T-2
B. MT-2
C.ML-1T-1
D. None of these
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| 8 |
We can express the work in term of
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A. directly measurable variables
B. indirectly measurable variables
C.either of them
D. both of them
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| 9 |
The state in which ice, water and vapour coexists in equilibrium is called
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A. zero degree celsius
B. zero degree fahrenheit
C.absolute zero
D. 373 K
|
| 10 |
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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| 11 |
The work done by the system on its environment is considered as
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A. positive
B. negative
C.zero
D. any one of them
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| 12 |
Pressure may be define as _______ per second per unit area:
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A. Change in force
B. Change in momentum
C.Change in energy
D. Work done
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| 13 |
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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| 14 |
If the volume of the gas is to be increased by 4 times, then
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A. Temperature and pressure must be doubled
B. At constant P the temperature must be increased by 4 times
C.At constant T the pressure must be increased by four times
D. It cannot be increased
|
| 15 |
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
|
| 16 |
First law of thermodynamic is special case of
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A. Law of conservation of energy
B. Charle's law
C.Law of conservation of mass
D. Boyle's law
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| 17 |
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
|
| 18 |
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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| 19 |
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
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| 20 |
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
|
| 21 |
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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| 22 |
Heat required to raise the temperature of one mole of a gas through 1 K at constant pressure is called
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A. heat capacity
B. specific heat capacity
C.specific heat at constant volume
D. specific heat at constant pressure
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| 23 |
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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| 24 |
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
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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 |
Heat travels through vacuum by
|
A. Conduction
B. Convection
C.Radiation
D. Both A and B
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| 27 |
A process in which no heat enters or leaves the system is called
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A. isochoric process
B. isothermal process
C.adiabatic process
D. none of them
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| 28 |
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
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| 29 |
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
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| 30 |
Internal energy is the sum of all the forms of
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A. K.E
B. P.E
C.both of them
D. none of them
|