CH-- AIR CLASS 7

Which gas released in the atmosphere creates a greenhouse effect trapping the heat?

• (a) Carbon dioxide

• (b) Oxygen

• (c) Nitrogen

• (d) All of these

Excess amount of CO2 is responsible for

• (a) global cooling

• (b) global warming

• (c) both (a) and (b)

• (d) none of these

What are the important objects for survival of plants and animals?

• (a) Rainfall

• (b) Sun light

• (c) Oxygen

• (d) All of these

Jet planes flying in the sky leave a ________ trail behind them

• BLACK

• WHITE

• BLUE

• GREY

The standard unit of measuring temperature is

• CELCIUS

• METER

• KELVIN

• FAHRENHIT

When water evaporates from land and different water bodies, it becomes

• ICE

• RAIN

• SNOW

• WATER VAPOUR

Cold air is ________ than hot air

• (a) Small and heavy

• (b) Less denser and light

• (c) Denser and heavy

• (d) Small and light

The degree of hotness and coldness of the air is known as

• WEATHER

• TEMPERATURE

• CLIMATE

• SEASON

Which is the second most plentiful gas in the air

• NITROGEN

• OXYGEN

• CARBON DIOXIDE

• ARGON

Our earth is surrounded by a huge blanket of

• AIR

• SAND

• PLANTS

• WATER