- Home
- General Science
Physics -- Heat and Thermodynamics
6.
The root-mean-square (rms) speed of oxygen molecules (O2) at a certain absolute temperature is v. If the temperature is doubled and the oxygen gas dissociates into atomic oxygen, the rms speed would be
- A.v
- B.√2v
- C.2v
- D.2√2v
- Answer
- Report
Answer : [C]
7.
The average translational kinetic energy of O2 (molar mass 32) at a particular temperature is 0.048 eV. The average translational kinetic energy of N2 (molar mass 28) molecules in eV at the same temperature is
- A.0.0015
- B.0.003
- C.0.048
- D.0.768
- Answer
- Report
Answer : [C]
8.
A closed vessel is maintained at a constant temperature. It is first evacuated and then vapour is injected into it continuously. The pressure of the vapour in the vessel
- A.increases continuously
- B.first increases and then remains constant
- C.first increases and then decreases
- D.none of the above
- Answer
- Report
Answer : [B]
9.
When an air bubble rises from the bottom to the surface of a lake, its radius becomes double. Find the depth of the lake, given that the atmospheric pressure is equal to the pressure due to a column of water 10 m high. Assume constant temperature and disregard surface tension.
- A.30 m
- B.40 m
- C.70 m
- D.80 m
- Answer
- Report
Answer : [C]
10.
A gas expands from 1 litre to 3 litres at atmospheric pressure.
The work done by the gas is about
- A.2 J
- B.200 J
- C.300 J
- D.2 x 105 J
- Answer
- Report
Answer : [B]
|
|
||||||||||||||||||||||||||||
