Air is not present in

• Building

• Ocean

• Vaccum

• Caves

Statement 1: Mountaineers carry oxygen cylinders with them while climbing high mountains.

Statement 2: The percentage of oxygen in the air decrease with increasing altitude.

• Statement 1 is true and statement 2 is the correct explanation

• Both statements are true

• Statement 1 is true and statement 2 is false

• Statement 1 is false and statement 2 is true

Statement 1: Police regulating traffic at a crowded crossing often wear a mask.

Statement 2: Mask filters carbon dioxide and sends pure oxygen inside

• Both Statements are true

• Both statements are false

• Statement 1 is false and statement 2 is true

• Statement 1 is true and statement 2 is false

Choose the odd one out

• Rustling of leaves

• Driving a car

• Flying of kite

• Blowing away of a newspaper

Arrange the following in descending order according to their percentage:

Nitrogen, Argon, Carbon dioxide, Oxygen

• Nitrogen > Argon > Oxygen > Carbon dioxide

• Nitrogen > Oxygen > Argon > Carbon dioxide

• Oxygen > Carbon dioxide > Nitrogen > Argon

• Argon > Carbon dioxide

Which of the following gas helps in burning?

• Nitrogen

• Oxygen

• Carbon dioxide

• Water vapour and Argon

Wind is

• air around us

• rising hot air

• air in motion

• none of these

The ratio of nitrogen to oxygen in the air is

• 1:4

• 4:1

• 3:1

• 1:2

Which is not a property of air?

• It occupies space

• It is transparent

• It is a solution.

• It is a compound.

Makes three fourth part of total air.

• Nitrogen

• oxygen

• Argon

• Water Vapour