A ……….show wind direction.
a) nanometer
b) wind vane
c) air vane
d) all of these
The percentage of nitrogen gas an air is……… percent approximately. NTS PET --------2018
a) 30%
b) 51%
c) 65%
d) 78%
About 21% of the air is …………gas.
NTS CT 25/08/2019 (11:30), NTS PET ------2018
a) nitrogen
b) oxygen
c) carbon dioxide
d) Argon
Percentage of in air is CO2 about:
a) 0.01 – 0.02%
b) 0.02 – 0.04 %
c) 0.03 – 0.04 %
d) 0.06 – 0.08 %
It is a color less gas.
a) oxygen
b) carbon dioxide
c) hydrogen
d) all of these
It has no smell.
a) oxygen
b) carbon dioxide
c) hydrogen
d) all of these
