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Class 7th English Chapter 8 Fire Friend and Foe

Class 7th English Chapter 8 Fire Friend and Foe


Very Short Answer Type Questions
Question 1:
Why the early man was afraid of fire?
Solution:
The early man might have seen volcanoes or lightning before he started using fire and was hence knew it was dangerous and powerful. So, he was scared of fire.
Question 2:
Give some examples of fuel.
Solution:
Wood, coal, cooking gas and petrol are examples of fuel.
Question 3:
Why a newspaper or stick lying in the open does not catch fire on its own?
Solution:
A fuel in presence of oxygen alone can’t start burning. Heat is required for a fuel to catch fire. That is the reason why a newspaper or stick lying in the open doesn’t catches fire.
Question 4:
Why gaps are left between buildings during construction?
Solution:
Gaps are left-between building during construction to reduce the risk of fire.
Question 5:
How the discovery of fire has helped the mankind?
Solution:
Discovery of fire has helped the early man to cope with nature. It also helped them adopt a settle mode of life.
Short Answer Type Questions
Question 1:
How fire is a good servant?
Solution:
Fire is a good servant. When kept under control fire helps us do many things. In most of our home we cook our food on fire.
We use fire to keep us warm during extreme winter. It is also used in generating electricity.
Question 2:
Before fire brigades were set out, how people tried to put out fire.
Solution:
Before the fire brigade came into the picture people used to extinguish fire forming human chain. Everyone was a fireman in that scenario.
People used to pass buckets filled with water from a pond or well through each other and the person at the extreme end used to pour it over the flames.
Question 3:
How have we learnt to control fire?
Solution:
Every year we spend millions of rupees for fighting fires. We spend even large sum of money to find out ways to prevent fire from happening and going out of control. In the process we have learnt to control fire and use it for our betterment.
Long Answer Type Questions
Question 1:
Explain with an example how can you put out fire by cutting the supply of oxygen.
Solution:
Oxygen is one of the three elements essential for causing fire. If we can disrupt the supply of oxygen then we can put of the fire.
This can be applied in case of small fires. If we throw a damp blanket or a sack over the fire, it cuts off the supply of oxygen and the fire is immediately put off.
Question 2:
Why we cannot use water to put out some fires?
Solution:
We cannot use water in case of oil and electric fires. Oil floats over water and thus oil fires cannot be extinguished using water.
Water flows on and it has the risk of spreading the fire along. In case of electric fires water cannot be used as an extinguisher. It being a good conductor of electricity, puts the life of the man spraying it in danger.
Extract Based Questions
Extract 1
Directions (Q. Nos. 1-6) Read the extract given below and answer the following questions.
Some fire cannot be put out with water. 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.
Question 1:
What is oil fire?
Solution:
A fire caused because of inflammable oils like petroleum, kerosene, diesel etc is called oil fire.
Question 2:
Name two kinds of fire that cannot be extinguished using water.
Solution:
Oil fire and electric fire cannot be extinguished using water.
Question 3:
Why water cannot be used to put out on oil fire?
Solution:
Oil being lighter than water floats over it, so water cannot be used to extinguish oil fires. Moreover, as the water spreads it carries along the oil with which in turn extends the fire.
Question 4:
Water cannot extinguish oil fire, but
(a) controls it
(b) spreads it
(c) has not impact on it
(d) None of these
Solution:
(b) spreads it
Question 5:
Find one word from the given lines that is antonym of ‘slow’.
(a) Spray
(b) Dangerous
(c) Rapid
(d) Quick
Solution:
(d) Quick
Question 6:
What can be used to control oil fires?
(a) Carbon extinguishers
(b) Damp blanket
(c) Sand
(d) All of the above
Solution:
(d) All of the above
Extract 2
Directions (Q. Nos. 1-6) Read the extract given below and answer the following questions.
The second way of putting the ……………….. burning material. The third way of putting out a fire is to remove the heat.
Question 1:
How can small fires be put out?
Solution:
Small fires can be put out using a damp blanket or a sack, since it shops oxygen from reaching the burning material.
Question 2:
What prevents oxygen to reach the burning material?
(a) Nitrogen
(b) Carbon dioxide
(c) Water
(d) Heat
Solution:
(b) Carbon dioxide
Question 3:
What is the third way of putting out a fire?
Solution:
The third way of putting out a fire is to remove the heat.
Question 4:
What is the method of extinguishing fire mentioned in the above extract?
(a) Removing the heat
(b) Spraying water
(c) Removing the fuel
(d) Removing the supply of oxygen
Solution:
(d) Removing the supply of oxygen
Question 5:
Which word in the above extract means ‘stop burning’?
Solution:
Extinguish
Question 6:
Which word in the above extract is a synonym of ‘moist’?
Solution:
Damp

Courtesy : CBSE