Which of the following is correct?
Air pollution is caused by :
Insecticides
Sewage
Smoke
Loud speakers
How is wind produced?
When Sun rays are blocked by the clouds.
When cool air rises up.
When water vapor in the air rises up.
When hot air rises up.
When is the air clean?
Morning
Afternoon
Evening
Night
The flame of a candle goes of when covered with a glass because :
There is no light.
The air does not reach the flame.
The air get trapped inside the glass.
There is no space inside the glass.
Which of the following is present everywhere?
Snow
Ice
Air
Rain
Weather is usually cool in the:
When the air contains gases, dust, fumes or odour in harmful amounts, it is called :
Water pollution
Air pollution
Soil pollution
Noise pollution
Air is present :
In the atmosphere
In the sky
In the clouds
Everywhere
When we cover the upper part of the plant with a plastic bag , the plant begins to drop. Why does this happen?
The plant does not get water .
The plant does not get any air to breathe .
Both a and b
