## Kinetic Theory Questions and Answers Part-9

1. Saturated vapour is compressed to half its volume without any change in temperature, then the pressure will be
a) Doubled
b) Halved
c) The same
d) Zero

Explanation: Saturated vapour is compressed to half its volume without any change in temperature, then the pressure will be the same

2. Air is pumped into an automobile tube upto a pressure of 200 kPa in the morning when the air temperature is 22°C. During the day, temperature rises to 42°C and the tube expands by 2%. The pressure of the air in the tube at this temperature, will be approximately
a) 212 kPa
b) 209 kPa
c) 206 kPa
d) 200 kPa

Explanation: 3. At what temperature volume of an ideal gas at 0°C becomes triple
a) 546°C
b) 182°C
c) 819°C
d) 646°C

Explanation: 546°C

4. If an ideal gas has volume V at 27°C and it is heated at a constant pressure so that its volume becomes 1.5V. Then the value of final temperature will be
a) 600°C
b) 177°C
c) 817°C
d) None of these

Explanation: 177°C

5. The temperature of an ideal gas at atmospheric pressure is 300K and volume 1m3. If temperature and volume become double, then pressure will be
a) $10^{5} N\diagup m^{2}$
b) $2\times10^{5} N\diagup m^{2}$
c) $0.5\times10^{5} N\diagup m^{2}$
d) $4\times10^{5} N\diagup m^{2}$

Explanation: 6. What is the mass of 2 litres of nitrogen at 22.4 atmospheric pressure and 273K
a) 28g
b) $14\times22.4 g$
c) 56 g
d) None of these

Explanation: 28g

7. The value of PV/T for one mole of an ideal gas is nearly equal to
a) 2 $J mol^{-1}k^{-1}$
b) 8.3 cal $mol^{-1}k^{-1}$
c) 4.2 $J mol^{-1}k^{-1}$
d) 2 cal $mol^{-1}k^{-1}$

Explanation: The value of PV/T for one mole of an ideal gas is nearly equal to 2 cal $mol^{-1}k^{-1}$

8. A tyre kept outside in sunlight bursts off after sometime because of
a) Increase in pressure
b) Increases in volume
c) Both (a) and (b)
d) None of these

Explanation: A tyre kept outside in sunlight bursts off after sometime because of increase in pressure

9. If the volume of the gas containing n number of molecules is V, then the pressure will decrease due to force of intermolecular attraction in the proportion
a) n / v
b) $n / V^{2}$
c) $\left(n / V\right)^{2}$
d) $1 / V^{2}$

Explanation: $\left(n / V\right)^{2}$
c) $\frac{V}{T}$
d) $\frac{P}{T}$