| 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
|
| 2 |
The internal energy of a system does not depend upon the
|
A. initial state of the system
B. final state of the system
C.path
D. none of them
|
| 3 |
Rate of diffusion is
|
A. Faster in solids than in liquids and gases
B. Faster in liquids than in solids and gases
C.Equal to solids, liquids and gases
D. Faster in gases than in liquids and solids
|
| 4 |
The heat required to raise the temperature of one mole of the gas through 1 K at constant volume is called
|
A. heat capacity
B. specific heat capacity
C.molar specific heat
D. molar specific heat at constant volume
|
| 5 |
The coefficient of linear expansion of iron is 0.000011 per°K. An iron rod is 10 metre long at 27°C. The length of the rod will be decreased by 1.1 mm when the temperature of the rod changes to
|
A. 0°C
B. 10°C
C.17°C
D. 20°C
|
| 6 |
The value of E0in coulomb's law is:
|
A. 9 x 109Nm2C-2
B. 8.85 x 10-12C2N-1m-2
C.8.85 x 10-12Nm2C-2
D. 9 x 109C2N-1m-2
|
| 7 |
What temperature is the same on Celsius scale as well as on Fahrenheit scale?
|
A. 32°C
B. -32°C
C.-40°C
D. -212°C
|
| 8 |
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
|
| 9 |
The curve representing an adiabatic process is called
|
A. isotherm
B. adiabat
C.adiable
D. none of them
|
| 10 |
The ideal gas law is
|
A. P = nRT
B. V = nRT
C.PV =RT
D. PV =nRT
|
| 11 |
At constant temperature, on increasing the pressure of a gas by 5%, its volume. The final temperature of the gas will be
|
A. 81 K
B. 355 K
C.627 K
D. 627°C
|
| 12 |
The volume of universal gas constant R is:
|
A. 8.314 J/K mole K
B. 8314 J/K mole K
C.8.314 J/mole K
D. None of these
|
| 13 |
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
|
| 14 |
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
|
| 15 |
A typical four stroke petrol engine undergoes how many successive processes in each cycle
|
A. one
B. two
C.three
D. four
|
| 16 |
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
|
| 17 |
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
|
| 18 |
On colliding in a closed container, the gas molecules
|
A. Transfer momentum to the walls
B. Momentum becomes zero
C.Move in opposite directions
D. Perform Brownian motion
|
| 19 |
If the formula PV = nRT, n denotes:
|
A. Number of molecules per unit volume
B. Number of moles
C.Number of molecules
D. None of these
|
| 20 |
The absolute temperature for an ideal gas is
|
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
|
| 21 |
A process in which no heat enters or leaves the system is called
|
A. isochoric process
B. isothermal process
C.adiabatic process
D. none of them
|
| 22 |
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
|
| 23 |
An isochoric process is one which take place at
|
A. Constant internal energy
B. Constant entropy
C.Constant volume
D. Constant pressure
|
| 24 |
The rate of change of momentum of a molecule is equal to:
|
A. Pressure
B. Work
C.Density
D. Force
|
| 25 |
The work done by the system on its environment is considered as
|
A. positive
B. negative
C.zero
D. any one of them
|
| 26 |
Efficiency of carnot engine is independent of the
|
A. temperature of sink
B. temperature of source
C.nature of the working substances
D. none of them
|
| 27 |
The curve representing an isothermal process is called
|
A. adiabat
B. isotherm
C.fixed temperature
D. none of them
|
| 28 |
The temperature scale approved in SI units is:
|
A. Celsius scale
B. Kelvin scale
C.Fehrenheit scale
D. None of these
|
| 29 |
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
|
| 30 |
No spark plug is needed in
|
A. petrol engine
B. diesel engine
C.both of them
D. none of them
|