A football full of air is heavier than an empty football.Why?
Air has weight
Air moves things
Air is everywhere
Air fills things
Which gas is used by the leaves during photosynthesis?
Nitrogen
Carbon dioxide
Oxygen
None of these
Which sentence is FALSE?
Air is all around us
Air has no weight
The wind is helpful in:
Moving sailboats
Drying clothes
Keeping us cool in summer
All the above
What makes the leaves move and trees sway?
Gale
Breeze
Strong gale
Strong breeze
What is wind?
Moving air
Moving fog
Hurricane
Which among the following is more powerful?
Storm
Which will have more smoke and dust?
City
Town
Lakeside
Forest
Oxygen is NOT used by:
Plants
Animals
Humans
None
Which gas is used by plants during day?
Hydrogen
