What is the third most common gas found in the air we breathe ________ ?

A. Hydrogen
B. Neon
C. Carbondioxide
D. Argon

Submitted by: Rashid Mehmood

The most common gas people breathe from clean air is nitrogen. Air is a mixture of gases, and the air on Earth contains about 78 percent nitrogen and about 21 percent oxygen. Argon, carbon dioxide neon, helium, methane, krypton, hydrogen and xenon are in much smaller amounts.

Related Mcqs:

Each day human body breathe in __________ liters of air.
A. 5,000 to 10,000
B. 10,000 to 15,000
C. 15,000 to 20,000
D. 20,000 to 25,000
Brass gets discoloured in air because of the presence of which of the following gases in air ________ ?
A. Carbon dioxide
B. Oxygen
C. Nitrogen
D. Hydrogen sulphide

Submitted by: Rashid Mehmood
The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is ________ ?
A. Argon
B. Xenon
C. Helium
D. Krypton

Submitted by: Rashid Mehmood
Quantity of fresh air required for a man is 1000 cubic feet of air for every____________?
A. 5 minutes
B. 10 minutes
C. 15 minutes
D. 20 minutes

Submitted by: WIQAR AHMAD
During which process of energy exchange does cold air displace warmer air?
A. Convection
B. Radiation
C. Conduction
D. None of these

Submitted by: Rida
What is the name of the gas used in an air conditioner?
A. Ammonia
B. Nitrous oxide
C. Freon
D. CO2

Submitted by: waqas shah
The gas, commonly known as “laughing gas”, is
A. Carbon Dioxide
B. Sulfur Dioxide
C. Nitrous Oxide
D. Sodium Oxide
Which of the gas is not known as green house gas?
A. Methane
B. Nitrous oxide
C. Carbon dioxide
D. Hydrogen

Submitted by: Farjan Ahmed Soomro
As comets get close to the sun, they start to “melt” and release gas and dust. This gas and dust forms what?
A. “coma” around the comet’s nucleus and a long tail that points away from the sun
B. “coma” that points away from the sun and a long tail around the comet’s nucleus
C. Only “coma” around the comet’s nucleus
D. Only a long tail that points away from the sun

Submitted by: Muhammad Abdullah
The thermosphere extends from an altitude of ________ to the base of ________ at ________?
A. 75 km, Mesosphere, 670 km
B. 80 km, Ionosphere, 680 km
C. 85 km, Exosphere, 690 km
D. 90 km, Ozone Layer , 690 km

Submitted by: Muhammad Abdullah