CLASS VII CHAPTER - 8 FIRE: FRIEND OR FOE

-

 Q1. What do you understand by the ‘flash point’ of a fuel?

Ans. Every fuel has a specific temperature at which it starts to burn. This specific temperature is called the flash point or kindling temperature of the fuel.

Q2. (i) What are some common uses of fire? (ii) In what sense is it a “bad master”?

Ans. (i) Some common uses of fire are: a) It is used to produce electricity b) It is used for cooking. c) It is also used to heat our home in winters. 

(ii) Fire is a “bad master” because if it not under control, it can create huge damage to lives, properties, forests, etc.

Q3. What are the three main ways in which a fire can be controlled or put out?

Ans.  Three main ways in which a fire can be controlled or put out are:

a) Stop the supply of the fuel b) Cool down the heat c) Stop the supply of oxygen 

Q4. Why does a burning candle go out when you blow on it? 

Ans. A burning candle goes out when you blow on it because when we blow air, we remove the hot air around the flame bringing down its temperature below the flash point. 

Q5. 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 or an electric fire. This is because, if water is sprayed on an oil fire, oil will come on the top layer of water and will still burn. As water flows quickly, it can take oil with it and thus increase the area where the fire can spread.

If water is sprayed on an electric fire, the person might get an electric shock and get killed.

Q6. What are some of the things you should do to prevent a fire at home and in the school? 

Ans. In order to prevent a fire at home and in the school, the following things can be done: i. All electrical appliances must be kept far from flammable things like furniture, etc. ii. Turn off the gas supply of the stove after use.  (Can use any other points)



Comments

Post a Comment

Popular posts from this blog

Class 9 THE SOLITARY REAPER

-
  “The Solitary Reaper” is a poem by the English poet William Wordsworth. The poem was inspired by the poet’s trip to Scotland in 1803 with his sister Dorothy Wordsworth. It was first published in 1807. In the poem, the speaker tries—and fails—to describe the song he heard a young woman singing as she cuts grain in a Scottish field. The speaker does not understand the song, and he cannot tell what it was about. Nor can he find the language to describe its beauty. "The Solitary Reaper" is a poem about music: the song a Scottish girl sings as she cuts hay with a sickle. Though the poem’s narrator cannot understand what the girl is actually singing about, the girl’s song sticks with him, its melancholy beauty echoing in his head “long after” its sound has faded. In this way, the poem suggests the ability of art to transcend cultural boundaries and even language itself. Art, in the poem, can communicate feeling or emotion even in the absence of concrete understanding. And yet, at
Read more

CLASSES VII - X REPORTED SPEECH FOR ALL

-
Reported Speech is used to report or convey statements made by someone else in the past, without using their exact words. FIVE RULES FOR CHANGING DIRECT TO REPORTED SPEECH 1. Add a Reporting Verb Clause Naisha said, "I love chocolate." Naisha said that she loved chocolate. Naisha said - Reporting Speech (like a journalist reporting something) that - conjuction said - reporting verb clause she loved chocolate - reported speech Difference between SAY vs TELL - 4 RULES #1 'Say'/said is used when you not want to specify who the message was being conveyed to #2 'Say'/said general information/facts or universal/ opinion without a specific address e.g., Amiara said, "It is lovely day." Amaira said that it was a lovely day. #3 'Tell'/told is a transitive verb so we need an object to receive it. #4 Tell/told is used to give instructions, command or request She said to Ravi, "I want to go for a movie tonight." She told Ravi that she wanted t
Read more

CLASS VIII ENGLISH CHAPTER 4 BEPIN CHOUDHARY'S LAPSE OF MEMORY

-
 Q1. Why did the man stare at Bepin Babu in disbelief?  Ans. According to Parimal Ghose, he met Bepin Babu at Ranchi in 1958. He got confused and stared at Bepin Babu in disbelief as the latter failed to recognize him and understood that Bepin had a memory lapse of his stay in Ranchi. Q2. Where did Bepin Babu say he went in October '58?  Ans. Bepin Babu said that he went to Kanpur in October '58 and spent the Puja with a friend. Q3. Mention any three (or more) things that Parimal Ghose knew about Bepin Babu. Ans. Given below are a few things that Parimal Ghose knew about Bepin Babu:  (i) Bepin Babu had a fall in Hudroo and injured his right knee.  (ii) Bepin Babu stayed in a bungalow at Ranchi and as he wasn’t so fond of hotel food and he preferred to have his meals cooked by a bawarchi.  (iii) He did not have any children, Bepin Babu lost his wife ten years ago and his only brother had died of insanity. Q4. Why did Bepin Babu worry about what Parimal Ghose had said? Ans. Bepin
Read more