FIRE – FRIEND AND FOE TEXT BOOK ANSWERS AND SOLUTIONS CBSE – CLASS – VII

Working with the Text –

Answer the following questions

1. What do you understand ‘by flash point’ of a fuel

Ans. Flash point is the
temperature at which a fuel begins to make fire is called ‘flash point. In the
presence of fuel, and oxygen all on a sudden the fuel will not burn itself. It
must have that very temperature which will begin fire in fuel. This is termed
as ‘flash point’.

2. i) What are some common uses of fire?

Ans. We use fire for various
purposes. We use fire –

a) To cook our daily
food

b) To protect
ourselves from cold.

c) To produce light at
night.

d) To generate
electricity.

ii) In what sense is it a “bad
master”?

Ans. Fire has its negative
sides also. If we are unable to control fire it can be a horrible entity. The
deaths all around the world caused by various reasons include fire to be the
prime. Carelessness, lacuna of the knowledge about fire safety and avoiding fire
safety rules cause huge deaths. Apart from these fire caused in the forests
destroys vast areas.

3. Match items in column A with those in column B

A B

i) Fuel -Lighted match
stick

ii) Oxygen – air

iii) Heat -coal

– Burning coal

– Wood

– Smouldering paper.

– Cooking gas

–

Ans. I) Fuel – coal, wood, cooking gas

ii) Oxygen – air

iii) Heat – lighted matchstick, burning coal, smouldering
paper.

4) What are the three
main ways in which a fire can be controlled or put out?

Ans. As three things help us to make fire, we can use those very three
things to control or put out fire.

Firstly, if we
stop the supply of oxygen to the fire, it will stop. We can do it by using the
spray of carbon-di-oxide or a damp blanket on the fire.

Secondly – we
can remove the heat from fire and put it out or control it. We can do this by
blowing air to the burning candle on fire. We can use water to remove the heat.
In this way the temperature will go down the flash point’ and we can control or
put out the fire.

Thirdly we can
control or put out fire by removing fuel from the fire. We can remove, oil,
wood, plastic, cooking gas etc. to do so.

5. Match the items in Box
‘A’ with those in Box ‘B’

Answer –

i) To burn paper or a
piece of wood ———–

ii) small fires can be put
out ———————

iii) When water is spread
on fire.—————

iv) A carbon di-oxide
extinguisher is the best thing ————————

v) Space left between
buildings —————-

We heat it before it
catches fire

With a damp blanket

It absorbs heat from the
burning material and lowers the temperature

To put out an electrical
fire.

Reduces the risk of fire

6. Why does a burning candle go out when you blow on it?

Ans. To make fire ‘heat’ is
very important. Likewise to put out fire also ‘heat’ is vital. So, when we blow
air on a candle flame, the candle flame goes down below the temperature of ‘flash
point’ and the candle flame goes out.

Q.7. Spraying water is not a good way of putting out an oil fire or an
electrical fire. Why not?

Ans. For both oil fire and
electrical fire water is not the good way.

For oil, water is not
good because oil floats a water. So, the flame will also move on water and keep
burning. It will move various places and increase the risk of fire.

Water is not the right
way for electric fire because water is a good conductor of electricity. If
anyone tries to put out an electric fire by spraying water, the person will get
an electric shock and might be killed.

A.8. What are some of the things you should do to prevent a fire at
home and in school?

Ans. “Prevention is better
than cure”. Indeed we can prevent fire at home and in the school by following
the ways given below-

a) Placing smoke
alarms we can prevent fire.

b) keeping fire extinguisher to prevent fire.

c) using MCBs to
protect from fire.

d) checking gas cylinder and tube time to time

e) keeping inflammable
items at a safe place.

f) changing the old
electric wires.

g) not keeping furniture
near the room heaters.

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