NBSE Class-9| Alternative English| Chapter-4 The tunguska Event: Siberia 1908

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In This chapter NBSE Class-9| Alternative English| Chapter-4 The tunguska Event: Siberia 1908, which is a part of the class 9 syllabus of Alternative English for students studying under Nagaland Board of School Education:

NBSE Class-9| Alternative English| Chapter-4 The tunguska Event: Siberia 1908

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PROSE

CHAPTER-4

I. Explain with reference to context. 

1. There seems to be only one explanation consistent with all the facts… 

Choose the correct answer. 

1. What do the scientists think is the most plausible answer to what happened the night of the Tunguska Event? 

a piece of flying antimatter exploded on contact with the matter on Earth 

b. a mini black hole passed through the Earth 

c. a piece of a comet hit the Earth 

d. an alien spaceship crashed on Earth 

Ans: (c) a piece of a comet hit the Earth 

2. Could a rare but natural event, the impact of a sizable cometary fragment trigger a nuclear war? 

a. What is the event that is mentioned here? 

Ans: The event mentioned here is that of a natural impact, one caused by an icy cometary fragment. 

b. Why would it trigger a nuclear war? 

Ans:- Natural events which are caused by cometary fragments simulate all effects of a nuclear explosion. In an age of nuclear weapon, man may act impulsively, assuming the catastrophe to be a nuclear strike and take the world on the path of destruction. In this way it would trigger a nuclear war. 

c.What does Sagan suggest we do in order to prevent a nuclear war? 

Ans:- Sagan suggests that in order to prevent a nuclear war, man must understand properly the phenomenon of comets and collisions and natural catastrophes. In that way we will be able to differentiate whether the event is caused by a natural force or by a nuclear strike.. 

II. Answer these questions briefly. 

1. What does Sagan mean when he says, ‘it’s all a matter of time-scale’, in relation to catastrophe? 

Ans:- By ‘it’s all a matter of time scale’ in relation to catastrophe, Sagan means to say that catastrophes will happen but we cannot predict when and where it will happen, it is all in the hand of time scale. 

2. How do natural events such as these simulate nuclear explosions? 

Ans:- Natural events such as these can replicate a nuclear-like explosion because the overall nature of cometary impact and the fireball, combine with loud explosion in the area of its impact, it is all similar to that of a nuclear burst. But there will be no gamma radiation or radioactive fallout. 

III. Answer these questions. 

1. What are the three explanations offered for the Tunguska Event? Why are these explanations not plausible?

Ans:- Some scientists have suggested that the Tunguska Event was caused by a piece of antimatter, extinguishing on contact with the ordinary matter of the Earth, disappearing in a flash of gamma rays. Others assumed the fact that a mini black hole passed through Earth in Siberia and out the other side. The third explanation given was that, perhaps it was a spaceship of some unimaginably advanced alien civilization, crashing in a remote region of an obscure planet due to anmechanical trouble. 

The absence of radioactivity at the impact side gives no support to the explanation in the first case. Secondly, the atmospheric shock waves which were recorded that day show no hint of an object booming out of the North Atlantic. Thirdly, there was no trace of a crashing spaceship at the site of the impact. None of the explanations strongly supported the evidence and therefore not plausible. 

2. Describe the cause of the Event. 

Ans:- There is no concrete evidence or proof to describe the cause of the Event but some scientists have suggested that it was caused by a piece of hurtling antimatter, extinguished on contact with the ordinary matter of the Earth, disappearing in a flash of gamma rays. However, the absence of radioactivity at the impact site gives no support to this explanation. Others assume that a mini black hole passed through the earth in Siberia and out the other side. But the records of atmospheric shock waves show no hint of an object booming out of the north Atlantic later that day..

Scientists presume that it was a space ship of some very advanced extraterrestrial civilization in distressed mechanical trouble, crashing in a remote region of an unclear planet. But at the site of the impact there is no trace of such ship. 

Analysis of all these assumptions and the only humanly understanding is that in 1908 a piece of a comet hit the earth. 

IV. Going Beyond 

1. In our daily life, what is the danger of becoming ‘complacent, relaxed and unconcerned’? Share your views in an essay of 150 words. 

Ans:- We are living in the 21st century where people resort to civilized way of confronting any issues. Our world had experienced war, devastation, natural calamities, and all the horror that come with it. We learn from our own mistakes and the precise outcome of that learning is the peace we so cherish now. In this modern world, many lives have perished, not by war, but by natural calamities. It struck anywhere, any time without warning, it is beyond human capacity to stop these calamities, but we can survive from these calamities, if we have knowledge on how it strikes and train to tackle such calamities. Lives are lost because of ‘complacent, relaxed, and unconcerned’ nature of our present life style. Nature is unpredictable, although modern technology can help us to certain extend but there is no guarantee that it can save us from any natural disaster or manmade disaster. Therefore, we need to come out of our comfort zone and learn how to safeguard ourselves from all these calamities and learn to save the lives of others too.

Class-9 Alternative English Notes/Solutions

Chapter No.Chapter’s Name
PROSE
Chapter 1On The Rule Of the Road
Chapter 2The Ogress and the two Orphans
Chapter 3The Indomitable spirit of Youth
Chapter 4The tunguska Event: Siberia 1908
Chapter 5The Devoted friends
POETRY
Chapter 6Sonnet – To Science
Chapter 7The character of a Happy Life
Chapter 8Mother’s Tears
Chapter 9The Soul’s Prayer
DRAMA
1.The Tale of Ivan the Fool
GRAMMAR
1.Auxiliaries
2.Articles
3.Tenses
4.Reported speech
5.Punctuation
Reading
WRITING
1.Story Writing
2.Dialogue
3.Article
4.Newspaper Report
SPEAKING
1.Listening Transcripts

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