| 1 |
Generally a temperature scale is established by
|
A. one fixed point
B. two fixed point
C. three fixed point
D. four fixed point
|
| 2 |
The absolute temperature of the tripple point of water is
|
A. 100°C
B. 4°C
C. 373 K
D. 273.16 K
|
| 3 |
The temperature scale approved in SI units is:
|
A. Celsius scale
B. Kelvin scale
C. Fehrenheit scale
D. None of these
|
| 4 |
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
|
| 5 |
Which of the following is not an assumption of kinetic energy
|
A. a finite volume of gas consists of very large number of molecules
B. the gas molecules are in random motion
C. collision between the gas molecules are inelastic
D. the size of the gas molecules is much smaller than the separation between molecules
|
| 6 |
Which of the following does not have the same units:
|
A. Work
B. Heat
C. Kinetic energy
D. Power
|
| 7 |
Maximum density of H2O is at the temperature
|
A. 32°F
B. 39.2°F
C. 42°F
D. 4°F
|
| 8 |
In all natural processes where heat flows from one system to another, there is always a net
|
A. decrease in entropy
B. increase in entropy
C. decrease or increase in entropy
D. none of them
|
| 9 |
The only significant motion possessed by the mono-atomic gas represented is:
|
A. Translatory
B. Rotatory
C. Vibratory
D. None of these
|
| 10 |
If 42 J heat is transferred to the system and the work done by the system is 32 J then what will be the change in internal energy
|
A. 0 J
B. 2 J
C. 5 J
D. 10 J
|
| 11 |
Rice takes longest to cook
|
A. In a submarine 100 m below the surface of the sea
B. At sea level
C. At Murree
D. At Mount Everest
|
| 12 |
Triple point of water is
|
A. 273.16°F
B. 372.16K
C. 273.16°F
D. 273.16
|
| 13 |
According to kinetic theory of gases, molecules of a gas behave like
|
A. Inelastic spheres
B. Perfectly elastic rigid sphere
C. Perfectly elastic non-rigid spheres
D. Inelastic non-rigid spheres
|
| 14 |
The example of reversible process is
|
A. an explosion
B. changes occur suddenly
C. slow compression of a gas
D. all of them
|
| 15 |
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
|
| 16 |
At constant volume temperature is increased. Then
|
A. Collision on walls will be less
B. Number of collisions per unit time will increase
C. Collision will be in straight lines
D. Collision will not change
|
| 17 |
The second law of thermodynamics is concerned with the circumstances in which
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A. heat can be converted into work
B. direction of flow of heat
C. none of them
D. both of them
|
| 18 |
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
|
| 19 |
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
|
| 20 |
When heat is removed from the system
|
A. negative
B. positive
C. zero
D. any one of them
|
| 21 |
The temperature of gas is produced by
|
A. At potential energy of its molecules
B. The kinetic energy of its molecules
C. The attractive force between its molecules
D. The repulsive force between its molecules
|
| 22 |
On the compression stroke of the petrol engine, the inlet value is closed and the mixture is compressed
|
A. adiabatically
B. isothermally
C. isochorcally
D. isobarically
|
| 23 |
The percentage of available heat energy converted into work by a diesel engine is roughly
|
A. 35 %`
B. 40 %
C. 35 - 40 %
D. 25 %
|
| 24 |
The number of translation degress of freedom for a diatomic gas is
|
A. 2
B. 3
C. 5
D. 6
|
| 25 |
Melting point of ice
|
A. Increases with increasing pressure
B. Decreases with increasing pressure
C. Is independent of pressure
D. Is proportional to pressure
|
| 26 |
Carnot heat engine only used
|
A. isothermal processes
B. adiabatic processes
C. both of them
D. none of them
|
| 27 |
If water in a closed bottle is taken up to the moon and opened, the water gets
|
A. Freeze
B. Boiled
C. Dissociated into O2and H2
D. Evaporated
|
| 28 |
No spark plug is needed in
|
A. petrol engine
B. diesel engine
C. both of them
D. none of them
|
| 29 |
If a process cannot be retraced in the backward direction by reversing the controlling factors, it is
|
A. a reversible process
B. an irreversible process
C. any one of them
D. both of them
|
| 30 |
Amount of heat required to raise the temperature of a body through 1 K is called its
|
A. Specific heat
B. Water equivalent
C. Thermal capacity
D. Entropy
|