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

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The acid and sodium bicarbonate react to form carbon dioxide gas.

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Important Questions on Combustion and Flame

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Science>Chemistry>Combustion and Flame>Controlling the Fire

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>Combustion and Flame>Controlling the Fire

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

MEDIUM

Science>Chemistry>Combustion and Flame>Controlling the Fire

Never put out a fire caused by oil with _____.

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Science>Chemistry>Combustion and Flame>Controlling the Fire

What does a Fire Brigade do when it arrives at a place where a building is on fire?

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Science>Chemistry>Combustion and Flame>Controlling the Fire

How should different kinds of fire be put out?

EASY

Science>Chemistry>Combustion and Flame>Controlling the Fire

Describe one method of putting out a fire caused by burning wood or paper.

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Science>Chemistry>Combustion and Flame>Controlling the Fire

State any five measures to safeguard ourselves from fire.

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Science>Chemistry>Combustion and Flame>Controlling the Fire

Fire caused due to electrical faults should be put out using water.

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Science>Chemistry>Combustion and Flame>Controlling the Fire

Why are fires produced by burning oil not extinguished by pouring water?

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Science>Chemistry>Combustion and Flame>Controlling the Fire

How does pouring water extinguish a fire?

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Science>Chemistry>Combustion and Flame>Controlling the Fire

How is the fire caused by electricity extinguished?

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Science>Chemistry>Combustion and Flame>Controlling the Fire

A second-degree burn involves blistering of the skin.

EASY

Science>Chemistry>Combustion and Flame>Controlling the Fire

Explain how

C O_{2}

is able to control fires?

EASY

Science>Chemistry>Combustion and Flame>Controlling the Fire

Give reason, why water is not used to control fires involving electrical equipment?

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Science>Chemistry>Combustion and Flame>Controlling the Fire

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>Combustion and Flame>Controlling the Fire

What is the first thing you should do if a fire breaks out in your house or neighbourhood?

MEDIUM

Science>Chemistry>Combustion and Flame>Controlling the Fire

Explain why, fire caused by electricity should not be extinguished by pouring water?

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Science>Chemistry>Combustion and Flame>Controlling the Fire

Fill in the blank with an appropriate option:

A special instrument used to put out small fires: _____ (Fire extinguisher/ Fire cracker)

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Science>Chemistry>Combustion and Flame>Controlling the Fire

What is a fire extinguisher? What is the substance used in the modern type of fire extinguishers? How is it an improvement over the soda acid-type and the foam-type fire extinguishers ?

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Science>Chemistry>Combustion and Flame>Controlling the Fire

A drum full of kerosene catches fire. What is the simplest way to put off this fire?

The acid and sodium bicarbonate react to form carbon dioxide gas.

Important Questions on Combustion and Flame

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