NCERT Solutions for Class 7 English Chapter 8 Fire: Friend and Foe
NCERT Solutions for Class 7 English includes various units comprising prose and poems with exercise and activity-based questions, as per the NCERT Class 7 English Syllabus. Every question of Class 7 NCERT English textbook has been covered extensively. Our subject matter experts have solved the unit questions in a simple manner, according to the latest CBSE syllabus. In this competitive age, it’s imperative for school students to always be ready to face challenges. Exams being one of those challenges in their lives. In order to excel in exams, students need to be extremely well-versed and have an in-depth understanding of all the textbook lessons. Here, we bring you the best in-class Swiflearn’s NCERT Solutions for Class 7 English to help your child ace his/her exams with flying colours. NCERT Solutions for Class 7 English Chapter 8 Fire Friend and Foe.
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NCERT Solutions for Class 7 Chapter 8 Fire: Friend and Foe
In the chapter Chapter 8 Fire Friend and Foe, we are exposed to the advantages and disadvantages of fire as an invention. The lesson talks about the three key requirements to produce a fire and how we can prevent it. It educates the learner about many things related to fire and how it is a good servant but a bad master!
Unit 8, Fire: Friend and Foe
- 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.
Ans. (c) fire.
(ii) (a) Fire is energy.
(b) Fire is heat and light.
(c) Fire is the result of a chemical reaction.
Ans. (c) Fire is the result of a chemical reaction.
- 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)
Ans. (iv) (ii) (iii) (i)
Working with the Text
Answer the following questions.
- What do you understand by the ‘flash point’ of a fuel?
Ans. Every fuel has a particular temperature at which it starts to burn. This temperature is called the ‘flash point’ or kindling temperature of the fuel.
- (i) What are some common uses of fire?
Ans. Some of the common uses of fire are that it is used in cooking, producing electricity and keeping our homes warm during winters.
(ii) In what sense is it a “bad master”?
Ans. Fire is a “bad master” when it gets out of control as it can cause damage to human lives, property, forests, etc.
- Match items in Column A with those in Column B.
(i) fuel – lighted matchstick
(ii) oxygen – air
(iii) heat – coal
– burning coal
– smouldering paper
– cooking gas
|(i) fuel||coal, wood, cooking gas|
|(iii) heat||lighted matchstick, smouldering paper, burning coal|
- What are the three main ways in which a fire can be controlled or put out?
Ans. First, take away the fuel. If the fire has no fuel to feed on, no burning can take place. Second, prevent oxygen as no supply of oxygen means no fire. Third, remove the heat as temperature can be brought down below flash point then fuel stops burning. These are the three main ways in which a fire can be controlled or put out are
- Match the items in Box A with those in Box B
(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
- 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.
|(i) To burn paper or a piece of wood,||we heat it before it catches fire.|
|(ii) Small fires can be put out||with a damp blanket.|
|(iii) When water is spread on fire,||it absorbs 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.|
- Why does a burning candle go out when you blow on it?
Ans. A burning candle goes out when you blow on it because you remove the hot air around the flame bringing down its temperature below the flash point, and hence, the candle goes out.
- Spraying water is not a good way of putting out an oil fire or an electrical fire. Why not?
Ans. Spraying water is not a good way of putting out an oil fire because 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. In case of an electrical fire as well, the person spraying water might receive an electric shock and be killed.
- What are some of the things you should do to prevent a fire at home and in the school?
Note: This question has to be answered by children.
Working with Language
- 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 cause of justice and fair play.
(ii) Have you insured your house against fire?
(iii) Diamond is nothing but carbon in its pure form.
(iv) If you put too 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 a long speech on the value of time.
- 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 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 more 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.
- 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 across the lawn.
(ii) We were not allowed to cross the frontier. So we drove along it as far as we could and 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. Anyone can see your motive.
(v) Go along the yellow line, then turn left. You will reach the post office in five minutes.
Speaking and Writing
- Look at the following three units. First reorder the items in each unit to make a meaningful sentence. Next, reorder the sentences to make a meaningful paragraph.
Use correct punctuation marks in the paragraph.
(i) and eighteen fire tenders struggled/the fire began on Monday/to douse the blaze till morning
Ans. The fire began on Monday and eighteen fire tenders struggled to douse the blaze till morning.
(ii) in a major fire/over 25 shops/were gutted
Ans. Over 25 shops were gutted in a major fire.
(iii) but property/was destroyed/worth several lakhs/no casualties were reported.
Ans. No casualties were reported but property worth several lakhs was destroyed.