8.Fire Friend and Foe

 

Ch 8 Fire : Friend and Foe Honeycomb

Comprehension Check(Page No:
118)

1. Mark the correct answer in each of the following.

(i) Early man was frightened of
(a) lightning and volcanoes.
(b) the damage caused by them.
(c) fire.

(ii) (a) Fire is energy.
(b) Fire is heat and light.
(c) Fire is the result of a chemical reaction.

Answer

(i) (c) fire.

(ii) (c) Fire is the result of a chemical reaction.

2.
From the boxes given below choose the one with the correct order of the following
sentences.

 

(i)
That is fire.

(ii)
A chemical reaction takes place.

(iii)
Energy in the form of heat and light is released.

(iv)
Oxygen combines with carbon and hydrogen.


(i) (ii) (iii) (iv)
(ii) (iii) (i) (iv)


(iv) (iii) (ii) (i)
(iv) (ii) (iii) (i)

Answer

(iv) (ii) (iii) (i)

Page
No: 119

 

Working with the Text

 

Answer
the following questions.

 

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

Answer

The particular temperature at which
the fuel begins to burn is called the ‘flash point’ of a fuel.

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


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

Answer

(i) The common
uses of fire are to cook food, warm our homes in winter, to generate
electricity and many more.

(ii) Fire is “bad
master” when it gets out of control. It can be dangerous and burn our houses,
shops, vast forest areas and many more. It also kills and injures hundreds of
people every year and causes destruction of huge properties.

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


A
B

(i)
fuel                    –
lighted matchstick

(ii)
oxygen             – air

(iii)
heat                 – coal

 

       – burning coal

 

       – wood

 

       – smouldering paper

 

       – cooking gas

Answer

a. fuel
– coal, wood, cooking gas
b. oxygen    – air
c. heat         – lighted match stick, burning coal,
smouldering

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

Answer


The three main ways in which a fire can be controlled or put out are :

(i) By taking away the fuel. If the fire has no fuel to feed on, no
burning can take place.

(ii) By preventing oxygen from reaching it
(iii) By bringing back the temperature below ‘flash point’ of the the fuel

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

 

  A

(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 dioxide extinguisher is the best thing

(v)
Space left between buildings

 

 

 B


it absorbs heat from the burning material and


lowers the temperature.


reduces the risk of fire.


with a damp blanket.


we heat it before it catches fire.


to put out an electrical fire.

Answer

(i) To burn paper or a
piece of wood – we heat it before it catches fire.

(ii) Small fire can be
put out – with a damp blanket.

(iii) When water is
spread on fire – it absorb the heat from the burning material and lowers the

 temperature.

(iv) A carbon dioxide
extinguisher is the best thing – to put out an electrical fire.

(v) Space left between
buildings – reduces the risk of fire.

Page No: 120

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

Answer

When we blow on candle, the hot air around the candle gets removed and it
brings down the temperature of candle below the flash point. Thus, a candle
goes out because no fuel can burn below its flash point.

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

Answer

Spraying water is not
a good way of putting out an oil fire or an electrical fire. If water is
sprayed onto an oil fire, the oil will float to the top of the water and
continue to burn. This can be very dangerous because water can flow quickly
carrying the burning oil with it and spreading the fire. Similarly, The person
spraying water on an electrical fire might receive an electric shock and be
killed.

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

Answer

Some of the things we
should do to prevent a fire at home and in the school:

(i) Precaution is
better than cure. We should be alert about the use of inflammable substances
and handle it with care. 

(ii) There is always
possibility of catching fire in old buildings of home and school due to short
circuits. Therefore, over loaded wires should be replaced with new ones and
Fuse should be checked at regular interval.

(ii) By spreading the
knowledge about the handling of fuel, its flash point and about its protection
after an accident.

(iv) Fire extinguisher
should be installed and old wiring must be replaced . Keeping the contact
number of fire police on speed dial in case if little accident may
happen. 

(v) Never taking the
little accident of fire lightly as it may lead to greater one and finding a way
out so that it may not happen in future. Not storing inflammable or combustible
things like kerosene and petrol in our homes and in the school.

Working with Language

 

1.
Read the following sentences.

 

To
burn paper or a piece of wood, we heat it before it catches
fire. We generally do it with a lighted match. Every fuel has a
particular temperature at which it burns

 

The
verbs in italics are in the simple
present tense. When we use it, we are not thinking only about the
present. We use it to say that something happens all the time or repeatedly, or
that something is true in general.

Find
ten examples of verbs in the simple present tense in the text ‘Fire: Friend and
Foe’ and write them down here. Do not include any passive verbs.

Answer

Combines

Comes

Catches

Blow

Has

Absorbs

Means

Allow

Lowers

Stops

Cuts

Burns

2.
Fill in the blanks in the sentences below with words from the box. You may use
a word more than once. 


carbon
cause
fire               smother

 

(i)
Gandhiji’s life was devoted to the ……………………. of justice and
fair play.

(ii)
Have you insured your house against …………………… ?

(iii)
Diamond is nothing but ……………………. in its pure form.

(iv)
If you put too much coal on the fire at once you will
…………………….. it.

(v)
Smoking is said to be the main ……………………… of heart disease.

(vi)
When asked by an ambitious writer whether he should put some
………………. into his stories, Somerset Maugham murmured, “No, the other
way round”.

(vii)
She is a …………………….. copy of her mother.

(viii)
It is often difficult to ………………. a yawn when you listen to a long
speech on the value of time.

Answer

(i) Gandhiji’s life
was devoted to the cause of justice and fair play.


(ii) Have you insured your house against fire?


(iii) Diamond is nothing but carbon in its pure from.


(iv) If you put to much coal on the fire at once you will smother it.


(v) Smoking is said to be the main cause of heart disease.


(vi) When asked by an ambitious writer whether he should put some fire
into his stories, Somerset
Maugham murmured, “No, the other way round”.


(vii) She is a carbon copy of her mother.


(viii) It is often
difficult to smother a yawn when you listen to as long speech on the
value of time.

Page
No: 121

 

3.
One word is italicised in each sentence. Find its opposite in the box and fill
in the blanks.

 


spending
shut
destroy             subtract
increase

 

(i)
You were required to keep all the doors open, not ………………

(ii)
PUPIL : What mark did I get in yesterday’s Maths test?


TEACHER : You got what you get when you add five and five and
………………… ten from the
total.

(iii)
Run four kilometres a day to preserve
your health. Run a lot more to ………………… it.

(iv)
If a doctor advises a lean and lanky patient to reduce his weight further, be sure he is doing it to
…………………. his income.

(v)
The world is too much with us; late and soon, Getting and …………….. we lay waste our powers.

– WORDSWORTH

Answer

(i) You were required
to keep all the doors open, not shut.


(ii) Pupil : What mark did I get in yesterday’s Maths test?


Teacher : You got what you get when you add five and five and subtract
ten from the total.


(iii) Run four kilometres a day to preserve your health Run a lot to destroy
it.


(iv) If a doctor advises a lean and lanky patient to reduce his weight further,
be sure he is doing it to          increase his
income.


(v) The world is too much with us; late and soon. Getting and spending
we lay waste our powers. 

 -WORDSWORTH

4.
Use the words given in the box to fill in the blanks in the sentences
below.

 


across
along           past
through

 

(i)
The cat chased the mouse ……………………… the lawn.

(ii)
We were not allowed to cross the frontier. So we drove …………….. it as
far as we could and came       back happy.

(iii)
The horse went ………………. the winning post and had to be stopped with
difficulty.

(iv)
It is not difficult to see ……………….. your plan. Anyone can see your
motive.

(v)
Go …………………. the yellow line, then turn left. You will reach the
post office in five minutes.

Answer

(i) The cat chased the
mouse across the lawn.


(ii) We were not allowed to cross the frontier. So we drove along it as
far we could an came back happy.


(iii) The horse went past the winning post and had to be stopped with
difficulty.

(iv) It is not
difficult to see through your plan. Any one can see your motive.


(v) Go along the yellow line, then turn left. You will reach the post
office in five minutes.

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