Match Column A with Column B. Column A Column B 1 . Nitrogen i. supporter of combustion 2 . Oxygen ii. significant impact on temperature 3 . Carbon dioxide iii. used in metallurgy 4 . Water vapour iv. used to fill air balloons 5 . Argon v. absorbs infrared radiation 6 . Helium vi. the main constituent of proteins

Nitrogen is the main constituent of protein s. It is the abundant gas in the atmosphere. Oxygen is the supporter of combustion. Fuel reacts with oxygen to release heat energy. Carbon dioxide is an important greenhouse gas. Carbon dioxide also absorbs and re-emits infrared radiation. Water vapour has a significant impact on temperature. It is the gaseous form of water. Argon is used in metallurgy. It is injected to stir the metal and help facilitate the refining steps. Helium is a gas and it occupies space. Helium gas is to fill air balloons . The grade 4 helium is known as the balloon grade helium. Column A Column B 1 . Nitrogen vi. the main constituent of proteins 2 . Oxygen i. supporter of combustion 3 . Carbon dioxide v. absorbs infrared radiation 4 . Water vapour ii. significant impact on temperature 5 . Argon iii. used in metallurgy 6 . Helium iv. used to fill air balloons

Match the columns: Column A Column B 1 . CO 2 (i) Lava 2 . Water purifier (ii) Quartzite 3 . Sandstone (iii) Tsunami 4 . Obsidian (iv) Fire extinguisher 5 . Earthquake (v) Ultra-violet rays

1-iv The carbon dioxide gas puts out fire because it is inflammable. So it is used in fire extinguishers. 2-v Electromagnetic radiations like ultraviolet rays obtained from the sun and are used to kill germs present in the water. 3-ii Quartzite is formed from sandstone which is a metamorphic rock. 4-i Obsidian is an igneous rock formed by the lava that cools and turns hard into solid rock. 5-iii Natural events that cause damage to life and property are called natural disasters or natural calamities. Earthquakes and tsunamis are natural calamities. Tsunamis can be caused by undersea earthquakes or volcanic eruptions. Column A Column B 1 . CO 2 (iv) Fire extinguisher 2 . Water purifier (v) Ultra-violet rays 3 . Sandstone (ii) Quartzite 4 . Obsidian (i) Lava 5 . Earthquake (iii) Tsunami

EASY

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During photosynthesis, plant take in gas.

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Important Questions on Air Around Us

MEDIUM

Science>Chemistry>Air Around Us>Composition of Air

A metal compound A reacts with dilute hydrochloric acid to produce effervescence. The gas evolved extinguishes a burning candle.

Name the gas that extinguishes the burning candle.

HARD

Science>Chemistry>Air Around Us>Composition of Air

How does planting saplings and taking care of them affect the composition of air?

EASY

Science>Chemistry>Air Around Us>Composition of Air

Which gas do plants use to make their food?

MEDIUM

Science>Chemistry>Air Around Us>Composition of Air

How is the fire caused by electricity extinguished?

MEDIUM

Science>Chemistry>Air Around Us>Composition of Air

Why is solid carbon dioxide known as dry ice?

EASY

Science>Chemistry>Air Around Us>Composition of Air

Name a gas which is essential for the survival of plants.

MEDIUM

Science>Chemistry>Air Around Us>Composition of Air

Match Column A with Column B.

Column A	Column B
$1$ . Nitrogen	i. supporter of combustion
$2$ . Oxygen	ii. significant impact on temperature
$3$ . Carbon dioxide	iii. used in metallurgy
$4$ . Water vapour	iv. used to fill air balloons
$5$ . Argon	v. absorbs infrared radiation
$6$ . Helium	vi. the main constituent of proteins

MEDIUM

Science>Chemistry>Air Around Us>Composition of Air

Plants use carbon dioxide from the air for photosynthesis. How is the carbon dioxide in the air (or atmosphere) replaced?

EASY

Science>Chemistry>Air Around Us>Composition of Air

_____ gets thinner with increase in altitude.

HARD

Science>Chemistry>Air Around Us>Composition of Air

How is the fire produced by burning oil (or petrol) extinguished?

EASY

Science>Chemistry>Air Around Us>Composition of Air

Explain how

C O_{2}

is able to control fires?

MEDIUM

Science>Chemistry>Air Around Us>Composition of Air

Animals and plants are interdependent for gaseous exchange.

MEDIUM

Science>Chemistry>Air Around Us>Composition of Air

Choose the correct word from the list given below:

List: nitrogen, carbon dioxide, wind, oxygen, earth.

Plants need _____ to make their food.

MEDIUM

Science>Chemistry>Air Around Us>Composition of Air

What is the common name of solid carbon dioxide?

MEDIUM

Science>Chemistry>Air Around Us>Composition of Air

Why do mountaineers and divers carry oxygen cylinders with them?

MEDIUM

Science>Chemistry>Air Around Us>Composition of Air

In which form do plants absorb nitrogen? Why do farmers add nitrogenous fertilisers to the soil? Which microorganism helps to provide nitrogen to the plants? How do plants absorb nutrients other than carbohydrates from the soil?

MEDIUM

Science>Chemistry>Air Around Us>Composition of Air

Match the columns:

Column A	Column B
$1$ . ${CO}_{2}$	(i) Lava
$2$ . Water purifier	(ii) Quartzite
$3$ . Sandstone	(iii) Tsunami
$4$ . Obsidian	(iv) Fire extinguisher
$5$ . Earthquake	(v) Ultra-violet rays

EASY

Science>Chemistry>Air Around Us>Composition of Air

The atmosphere gets denser the higher you go.

EASY

Science>Chemistry>Air Around Us>Composition of Air

The statement given below is incorrect. Write correct statement.

Carbon dioxide is given out by the plants during photosynthesis.

MEDIUM

Science>Chemistry>Air Around Us>Composition of Air

The statement given below is incorrect. Write correct statement.

Plants are not dependent on animals for the supply of carbon dioxide.

During photosynthesis, plant take in gas.

Important Questions on Air Around Us

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