| 1 |
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
|
| 2 |
The temperature scale approved in SI units is:
|
A. Celsius scale
B. Kelvin scale
C. Fehrenheit scale
D. None of these
|
| 3 |
Electromagnetic waves emitted by hot bodies are called:
|
A. Photoelectrons
B. Alpha rays
C. Thermal radiation
D. None of these
|
| 4 |
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
|
| 5 |
Which of the following is a state variable
|
A. entropy
B. pressure
C. volume
D. all of them
|
| 6 |
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
|
| 7 |
Tick the correct pair when M denotes the molecular mass and other symbols carry usual meanings:
|
A. N = nNAm = MNA
B. n = N NA, M = mNA
C. M = NA/N , NA= m/n
D. N = nNA, M = mNA
|
| 8 |
Average KE of a gas molecule has:
|
A. Direct relation with absolute temperature and inverse relation with pressure
B. Direction relation with both absolute temperature and pressure
C. Inverse relation with both absolute temperature and pressure
D. None of these
|
| 9 |
At absolute temperature, the kinetic energy of the molecules
|
A. Becomes zero
B. Becomes maximum
C. Becomes minimum
D. Remain constant
|
| 10 |
Triple point of water is
|
A. 273.16°F
B. 372.16K
C. 273.16°F
D. 273.16
|
| 11 |
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 %
|
| 12 |
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
|
| 13 |
Generally a temperature scale is established by
|
A. one fixed point
B. two fixed point
C. three fixed point
D. four fixed point
|
| 14 |
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
|
| 15 |
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
|
| 16 |
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
|
| 17 |
On a cold morning a metal surface will fell colder to touch than a wooden surface, because
|
A. Metal has high specific heat
B. Metal has high thermal conductivity
C. Metal has low specific heat
D. Metal has low thermal conductivity
|
| 18 |
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
|
| 19 |
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
|
| 20 |
In an ideal gas, the molecules have:
|
A. Kinetic energy only
B. Potential energy only
C. Both KE and PE
D. None of these
|
| 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 |
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
|
| 23 |
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
|
| 24 |
If a system undergoes a natural process it will go in the direction that causes the entropy of the system plus the environment to increase, this is another statement of
|
A. second law thermodynamics
B. first law of thermodynamics
C. third law of thermodynamics
D. none of them
|
| 25 |
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
|
| 26 |
The number of translation degress of freedom for a diatomic gas is
|
A. 2
B. 3
C. 5
D. 6
|
| 27 |
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
|
| 28 |
In the study of thermodynamics, which gas is considered as the working substance
|
A. real gas
B. ideal gas
C. any gas may be ideal or real
D. none of them
|
| 29 |
According to the second law, which is must to produce work
|
A. a source contains a large amount of heat energy
B. two sources at the same temperature
C. two sources at the different temperatures
D. a source contains a small amount of energy
|
| 30 |
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
|