UP Board Class 7 English 8. Fire - Friend and Foe is a Hindi Medium Solution which is prescribed by Uttar Pradesh Board for their students. These Solutions is completely prepared considering the latest syllabus and it covers every single topis, so that every student get organised and conceptual learning of the concepts. Class 7 Students of UP Board who have selected hindi medium as their study medium they can use these Hindi medium textSolutions to prepare themselves for exam and learn the concept with ease.
(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. Early humans did not understand what fire was or how to control it. Seeing its destructive power in nature, like in forest fires caused by lightning, made them fear it greatly.
(ii) (c) Fire is the result of a chemical reaction. Scientifically, fire occurs when a fuel (like wood or gas) combines with oxygen in the air and gets heated to a certain temperature. This process is a chemical reaction that releases energy as heat and light.
(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.
Answer:
The correct sequence that explains how fire is produced is: (iv) (ii) (iii) (i).
Explanation: First, oxygen combines with carbon and hydrogen in the fuel (iv). This combination starts a chemical reaction (ii). This reaction then releases energy as heat and light (iii). The final result of this whole process is what we see and call fire (i).
Answer:
The 'flash point' of a fuel is the specific minimum temperature at which the fuel gets hot enough to catch fire easily and start burning. It is different for different materials. For example, petrol has a very low flash point, while wood has a much higher one.
Answer:
(i) Fire is a very useful friend. Some of its common uses are:
A
(i) fuel
(ii) oxygen
(iii) heat
B
- lighted matchstick
- air
- coal
- burning coal
- wood
- smouldering paper
- cooking gas
Answer:
(i) Fuel - coal, wood, cooking gas
(ii) Oxygen - air
(iii) Heat - lighted match stick, burning coal, smouldering paper
Note: These are the three essential things needed to start and sustain a fire, often called the "Fire Triangle."
Answer:
A fire can be controlled or put out by removing any one of the three elements of the Fire Triangle:
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 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.
Answer:
When we blow on a burning candle, two things happen:
Answer:
Spraying water is dangerous and ineffective for these fires:
Answer:
Preventing fire is always better than fighting it. Here are some important precautions:
Answer:
Here are ten verbs in the simple present tense from the chapter:
(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 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.
(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) 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. - WORDSWORTH
(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) ................... 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 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.
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