Unit 3 Theory and Listening

 

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A. Listen to the following scientific passage and answer the questions given  below

 

Questions:

1. What are parts of a thunder storm?

2. Why do we see lightning first and then hear thunder?

3. _________ is the maximum temperature that lightning 

   can reach.

4. Say true or false. The colour of the lightning depends 

   on temperature and gases in the air.

5. Name the three types of lightening.

Answers:

1. Lightning and thunder are parts of a thunderstorm.

2. Lightning travels through the air faster than sound. 

   That’s why we see lightning first and then hear thunder.

3.  30000 degrees

4. True

5. Forked lightning, sheet lightning and ball lightning are 

   the three types of lightning.

    B. Listen to the following scientific passage and 

   answer the questions given  below:

1. 
    

   Questions:

   1. What is the event horizon?

2. What are the most common black holes?

3. Where do Supermassive black holes exist?

4. When was the first black hole discovered?

5. Say true or false: Sagittarius A is a stellar black hole.

Answers:

1. The boundary of a black hole is called the event 

   horizon, a point of no return.

2. Stellar and supermassive black holes are the most 

   common black holes.

3. Supermassive black holes exist at the centre of every 

   large galaxy.

4. The first black hole was discovered in 1971.

5. False