Science : Physics : Chapter - 15 : Air Around Us

Our earth is surrounded by a thin layer of air called _____________________ .

• Atmosphere

• Air

• Wind

_______________ in motion is called wind .

• Wind

• Air

• Atmosphere

• Oxygen

______________ is present in water and soil .

• Wind

• Atmosphere

• Air

• Carbon-dioxide

_______________ supports burning and is necessary for living organisms .

• Nitrogen

• Water Vapour

• Carbon-dioxide

• Oxygen

The envelope of air that surrounds the earth is known as __________________________ .

• Atmosphere

• Respiration

• Air

Aquatic animals use dissolved air in water for _______________________ .

• Air

• Respiration

• Atmosphere

• Water Vapour

Plants and animals depend on each other for exchange of oxygen and carbon-dioxide from ______________ .

• Smoke

• Atmosphere

• Respiration

• Air

The windmill is used to draw water from _______________ and to run flour mills .

• Tubewells

• Ponds

• Wells

Windmills are also used to generate ____________________ .

• Smoke

• Electricity

• Dust

• Water

___________________ contains a few gases and fine dust particles and is often harmful .

• Nitrogen

• Water Vapour

• Dust

• Smoke