Advertisements
Advertisements
प्रश्न
List five activities that are possible due to the presence of air.
Advertisements
उत्तर
- Respiration
- Photosynthesis
- Burning
- Movement of sailing yachts, gliders, parachutes, airplanes
- Generation of electricity by windmills
संबंधित प्रश्न
How is greenhouse effect produced?
What is wind?
Name two air pollutants which cause acid rain.
Tick (√) the correct alternative from the choice given for the following statement.
Fuels which do not leave any residue on burning are
A mixture has a variable composition. Give three other reasons why air is considered a mixture and not a compound.
Air has variable composition and hence there is ______ oxygen at lower altitudes than at higher altitudes.
Draw a neat labelled diagram for the following experiment.
To prepare oxygen in the laboratory from hydrogen peroxide and a catalyst.
Take a squeezable bottle. Make a hole on the lid and close the bottle tightly. Bring the bottle near your face and press the bottle. What do you feel?
In a number of musical instruments, air plays an important role. Can you name some such instruments?
Explain the following observations very briefly
A firki does not rotate in a closed area.
