Fire Control

Q.

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

Q.

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

Q.

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

Q.

Combustible substance that burn or catch fire easily are called inflammable substances

1. True
2. False

Q.

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

Q.

How does pouring water extinguish a fire ?

Q.

A substances that catch fire easily are called the__________substances.

Q.

.The ignition temperature of white phosphorus is 35 degrees. What will happen if it is kept in a room in summer when the temperature rises to 35 degrees? H

Q.

Choose the correct statement about inflammable substances from the following. They have

1. low ignition temperature and cannot catch fire easily

2. high ignition temperature and can catch fire easily

3. low ignition temperature and can catch fire easily.

4. high ignition temperature and cannot catch fire easily.

Q.

You are provided with three watch glasses containing milk, mustard oil, and petrol respectively. Suppose you bring a burning candle near this one by one, which material will catch fire instantly and why?

Q.

Explain what is fire.

Q.

How is the fire caused by electricity extinguished?

Q.

If the clothes of a person working in the kitchen catch fire, then to extinguish the fire :

(a) sand should be thrown over the burning clothes

(b) water should be thrown over the burning clothes

(c) polyester blanket should be used to cover the burning clothes

(d) woollen blanket should be used to cover the burning clothes

Q. Which of the following is the correct set of components in a fire triangle?

1. Air, fuel, heat
2. Fuel, heat, light
3. Air, water, heat
4. Air, fuel, water

Q.

If you see a person whose clothes are on fire, how will you extinguish the fire ? Give reason for answer.

Q.

A mixture of alcohol and water will burn easily.

1. True

2. False

Q.

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

Q. A bunsen burner has holes near the bottom in order to:

1. decrease ignition temperature.
2. supply oxygen.
3. supply carbon dioxide.
4. increase ignition temperature.

Q.

A piece of cotton cloth wrapped around an iron pipe does not catch fire easily. Which of the following reasons supports the above information ?

1. Iron is non-combustible in nature
2. Iron pipe does not attain its ignition temperature
3. Cotton cloth wrapped around the pipe does not attain its ignition temperature
4. Cotton cloth is non-combustible in nature

Q. Explain the principle on which a fire extinguisher works.

Q. The lowest temperature at which a substance catches fire is:

1. Melting point
2. Boiling point
3. Ignition temperature
4. Critical temperature

Q. Fire extinguishers containing $C{O}_2$ are the best extinguishers for fires involving electrical equipment:

1. because $C{O}_2$ being heavier than oxygen increases fire.
2. because $C{O}_2$ being lighter than oxygen covers the fire like a blanket.
3. because $C{O}_2$ being heavier than oxygen covers the fire like a blanket.
4. None of these

Q.

Draw a labelled Fire Triangle. [2 MARKS]

Q. What are the three essential requirements to produce fire? How fire extinguisher is useful for controlling the fire.

Q. Inflammable substances have_______.

1. none of the above
2. low ignition temperature.
3. moderate ignition temperature.
4. high ignition temperature.

Q. Fire involving electrical equipment can be extinguished by using __________.

1. water
2. $C{O}_2$
3. blanket
4. naphthalene

Q. What kinds of fire extinguishers are most often used for extinguishing an electrical fire?

Q. Why electrical equipment on burning do not extinguished fire by water?

1. Water shows exothermic reaction with electrical equipment.
2. Water conduct electricity with electrical equipment's.
3. Water is a combustible substance.
4. Water shows endothermic reaction.

Q. Choose the correct option for [10]

1. articles were made by him
2. articles have been made
3. articles had been made by him
4. articles were being made

Q. How water helps in extinguishing fire?

1. Water cools the combustible material so that its temperature is brought above the ignition temperature.
2. Water heats the combustible material so that its temperature is brought below the ignition temperature.
3. Water cools the combustible material so that its temperature is brought below the ignition temperature.
4. None of these