| 1 |
The disorder in the system increases due to the
|
A. removal of heat
B. addition of heat
C. removal or addition of heat
D. none of them
|
| 2 |
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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| 3 |
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
|
| 4 |
Specific heat at constant pressure is greater than the specific heat at constant volume because
|
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
|
| 5 |
Which of the following does not have the same units:
|
A. Work
B. Heat
C. Kinetic energy
D. Power
|
| 6 |
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
|
| 7 |
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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| 8 |
A process is a reversible process, if the entropy of the system
|
A. increases
B. decreases
C. remains constant
D. none of them
|
| 9 |
The concept of entropy was introduced into the study of thermodynamics in
|
A. 1856
B. 1865
C. 1656
D. 1685
|
| 10 |
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
|
| 11 |
A heat engine is that which converts
|
A. mechanical energy into thermal energy
B. thermal energy into mechanical energy
C. K.E into potential energy
D. heat energy into light energy
|
| 12 |
The ideal gas law is
|
A. P = nRT
B. V = nRT
C. PV =RT
D. PV =nRT
|
| 13 |
If the volume of the gas is to be increased by 4 times, then
|
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
|
| 14 |
The absolute temperature of the tripple point of water is
|
A. 100°C
B. 4°C
C. 373 K
D. 273.16 K
|
| 15 |
During the whole carnot cycle
|
A. Thermal equilibrium is maintained
B. mechanical equilibrium is maintained
C. both the thermal and mechanical equilibriumis maintained
D. both the thermal and mechanical equilibrium is not maintained
|
| 16 |
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
|
| 17 |
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
|
| 18 |
In the formula P = N0KT, N0denotes:
|
A. Number of molecules per unit per volume
B. Number of moles
C. Number of molecules
D. None of these
|
| 19 |
On the exaust stroke, the outlet values opens. The residual gases are expelled and piston moves
|
A. outwards
B. inwards
C. in either way
D. none of these
|
| 20 |
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
|
| 21 |
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
|
| 22 |
The number of translation degress of freedom for a diatomic gas is
|
A. 2
B. 3
C. 5
D. 6
|
| 23 |
Adiabatic change occurs when the gas
|
A. expands
B. compressed
C. expands or compressed
D. expands or compressed rapidly
|
| 24 |
One mole of any substance contain
|
A. same number of molecules
B. different number of molecules
C. may be same or different
D. none of them
|
| 25 |
An isochoric process is one which take place at
|
A. Constant internal energy
B. Constant entropy
C. Constant volume
D. Constant pressure
|
| 26 |
Gas constant per molecule is called:
|
A. Universal gas constant
B. Stefen's constant
C. Boltzmann constant
D. Gravitation constant
|
| 27 |
The relationship between Boltzmann constant k with R and NAis given as:
|
A. k = RNA
B. k =R/NA
C. k = NR/NA
D. None of these
|
| 28 |
The example of irreversible process is
|
A. slowly liquification
B. slowly evaporation
C. an explosion
D. all of them
|
| 29 |
In an ideal gas, the molecules have:
|
A. Kinetic energy only
B. Potential energy only
C. Both KE and PE
D. None of these
|
| 30 |
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
|