| 1 |
The bicycle pump provides a good example of
|
A. first law of thermodynamics
B. second law of thermodynamics
C. third law of thermodynamics
D. none of them
|
| 2 |
Triple point of water is
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A. 273.16°F
B. 372.16K
C. 273.16°F
D. 273.16
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| 3 |
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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| 4 |
Two metal rods A and B have their initial lengths in the ratio 2 : 3 and coefficients of linear expansion in the ratio 4 : 3. When they are heated through same temperature difference the ratio of their linear expansion is
|
A. 1 : 2
B. 2 : 3
C. 3 : 4
D. 8 : 9
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| 5 |
The curve representing an adiabatic process is called
|
A. isotherm
B. adiabat
C. adiable
D. none of them
|
| 6 |
At constant temperature, if the density of the gas is increased, its pressure will:
|
A. One kg of a substance
B. Unit volume of a substance
C. One mole of a substance
D. None of these
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| 7 |
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
|
| 8 |
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
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| 9 |
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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| 10 |
It is impossible to devise a processes which may convert heat, extracted from a single reservoir, entirely into work without leaving any change in the working system. This is the statement of
|
A. Clausius statement of second law
B. Kelvin'sstatement of second law
C. Clausius statement of first law
D. Kelvin's statement of first law
|
| 11 |
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:
|
A. Force
B. Density
C. Work done
D. Pressure
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| 12 |
An isochoric process is one which take place at
|
A. Constant internal energy
B. Constant entropy
C. Constant volume
D. Constant pressure
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| 13 |
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
|
| 14 |
We can express the work in term of
|
A. directly measurable variables
B. indirectly measurable variables
C. either of them
D. both of them
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| 15 |
The rate of change of momentum of a molecule is equal to:
|
A. Pressure
B. Work
C. Density
D. Force
|
| 16 |
The temperature scale approved in SI units is:
|
A. Celsius scale
B. Kelvin scale
C. Fehrenheit scale
D. None of these
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| 17 |
Tick the correct pair when M denotes the molecular mass and other symbols carry usual meanings:
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A. N = nNAm = MNA
B. n = N NA, M = mNA
C. M = NA/N , NA= m/n
D. N = nNA, M = mNA
|
| 18 |
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
|
| 19 |
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
|
| 20 |
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
|
| 21 |
The highest efficiency of a heat engine whose low temperature is 17°C and the high temperature is 200°C is
|
A. 70%
B. 100%
C. 35%
D. 38%
|
| 22 |
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
|
| 23 |
Electromagnetic waves emitted by hot bodies are called:
|
A. Photoelectrons
B. Alpha rays
C. Thermal radiation
D. None of these
|
| 24 |
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
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| 25 |
The ideal gas law is
|
A. P = nRT
B. V = nRT
C. PV =RT
D. PV =nRT
|
| 26 |
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
|
| 27 |
The percentage of available heat energy converted into work by a petrol engine is roughly
|
A. 35 %
B. 40 %
C. 35 to 40 %
D. 25 %
|
| 28 |
In the reverse process, the working substance passes through the same stages as in the direct process and
|
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
|
| 29 |
The percentage of available heat energy converted into work by a diesel engine is roughly
|
A. 35 %`
B. 40 %
C. 35 - 40 %
D. 25 %
|
| 30 |
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
|