| 1 |
If a molecule with momentum mv strikes a wall and rebound then the change in momentum will be:
|
A. -2 mv
B. Zero
C. 2 mv
D. mv
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| 2 |
At O° K which of the following properties of a gas will be zero?
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A. Kinetic energy
B. Potential energy
C. Vibrational energy
D. Density
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| 3 |
The bicycle pump provides a good example of
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A. first law of thermodynamics
B. second law of thermodynamics
C. third law of thermodynamics
D. none of them
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| 4 |
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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| 5 |
If a liquid is heated in weightlessness, the heat is transmitted through
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A. Conduction
B. Convection
C. Radiation
D. Neither, because the liquid cannot be heated in weightlessness
|
| 6 |
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
|
| 7 |
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
|
| 8 |
The example of reversible process is
|
A. an explosion
B. changes occur suddenly
C. slow compression of a gas
D. all of them
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| 9 |
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
|
| 10 |
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
|
| 11 |
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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| 12 |
A diatomic gas molecule has
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A. translational energy
B. rotaional energy
C. vibrational energy
D. all of them
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| 13 |
No spark plug is needed in
|
A. petrol engine
B. diesel engine
C. both of them
D. none of them
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| 14 |
The ideal gas law is
|
A. P = nRT
B. V = nRT
C. PV =RT
D. PV =nRT
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| 15 |
One mole of any substance contain
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A. same number of molecules
B. different number of molecules
C. may be same or different
D. none of them
|
| 16 |
Carnot heat engine only used
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A. isothermal processes
B. adiabatic processes
C. both of them
D. none of them
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| 17 |
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
|
| 18 |
If the ratio of densities of two gases is 1:4, then the ratio of their rates of diffusion into one another is
|
A. 2 : 1
B. 4 : 1
C. 1 : 4
D. 3 : 4
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| 19 |
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
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| 20 |
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
|
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
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| 21 |
Specific heat at constant pressure is greater than the specific heat at constant volume because
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A. Heat is used up to increase temperature at constant pressure
B. Heat is used by gas for expansions purposes at constant pressure
C. Heat is use dup to increase internal energy
D. The above statement is invalid
|
| 22 |
Generally a temperature scale is established by using certain physical properties of a material which varies
|
A. nonlinearly with temperature
B. linearly with temperature
C. either of them
D. none of them
|
| 23 |
The internal energy of an ideal gas system is generally the
|
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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| 24 |
The concept of entropy was introduced into the study of thermodynamics in
|
A. 1856
B. 1865
C. 1656
D. 1685
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| 25 |
When the temperature of source and sink of a heat engine become equal entropy change will be
|
A. Zero
B. Max
C. Min
D. -ve
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| 26 |
A gas which strictly obeys the gas laws under all conditions of temperature and pressure is called:
|
A. Ideal gas
B. Inert gas
C. Real gas
D. None of these
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| 27 |
One kilogram of different substances contain
|
A. same number of molecules
B. different number of molecules
C. may be same or different
D. none of them
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| 28 |
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
|
| 29 |
Heat required to raise the temperature of one mole of a gas through 1 K at constant pressure is called
|
A. heat capacity
B. specific heat capacity
C. specific heat at constant volume
D. specific heat at constant pressure
|
| 30 |
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
|