Class-7 English Reader (Special), Lesson-10 Thamas Alva Edison / M.P. Board

Lesson-10

Thomas Alva Edison

Exercises

Fill up the blanks:

1. Scientists and inventors spend a lot of time to invent new things.
2. Alexander Fleming worked very hard in order to find out penicillin mould.
3. General Lefferts offered Edison a large sum of money to buy his new invention.
4. The modern gramophone is a type of talking machine invented by Thomas Alva Edison.
5. Mr. Vajpayi’s house was absolutely dark because all the lights had been turned off.

Answer the questions given below:

(in not more than three or four sentences each)

Q1.    What was young Tom doing one day? Why was he doing so?

Ans- One day young tom was trying to hatch eggs by sitting on them because his father told him that a duck sits on its eggs and hatches them.

Q2.    When did Tom start his experiments?

Ans- tom started his experiments at the age of eight.

Q3.    Why did young Edison lose many of his jobs?

Ans- Young Edison lost many of his jobs as he spent a lot of time in experiments and his employers felt that he was wasting time.

Q4.    What was Edison’s first important invention?

Ans- Edison’s first important invention was the improvement in telegraphy.

Q5.    How did Edison get the money he needed for starting a laboratory and a factory?

Ans- General Lefferts bought Edison’s invention in 40,000 dollars. Thus he got the money he needed for starting a laboratory.

Q6.    What is a talking machine? What is a talkie?

Ans- A talking mahine is a gramophone and talkie is a talking picture.

Q7.    Why did the Americans turn off their lights for a while when Edison died?

Ans- Americans turned off their lights for a while when Edison died as a mark of respect for him.

Click here for Solutions and Additional Exercises on NCERT Science Class-7

Read the following sentences and tick true(T) or false(F):

1.    Thomas Alva Edison is the inventor of gramophone and electric bulb. (T)

2.    Edison was born in England. (F)

3.    Edison made telegraphy more useful. (T)

4.    General Lefferts offered 40,000 dollars to buy Edison’s new invention. (T)

5.    Edison’s most important and useful invention is electric bulb. (T)

6.    Edison produced the first ‘talkie’ or talking picture in 1915. (F)

Write one word for every clue given below:

1. A person who helps somebody-  [assistant]
2. A person who has invented something. [inventor]
3. A thin wire that produces light when the electricity passes through it. [filament]
4. Scientific test that is carried out to gain new knowledge [experiment]
5. To a very high degree [extremely]
6. A machine that produces writing similar to print [typewriter]
7. The person who gives somebody a job to do for payment. [employer]

Special English-2      Special English-3 

Use the following words in the sentences given below:

intelligent,       experiments,        messages,        telegraph operator,     respect

1. Edison learnt telegraphy and started working as a telegraph operator.
2. We can send more messages through telegraph.
3. Americans respect Edison because of his contribution as a scientist.
4. Edison’s mother knew that he was very intelligent.
5. Madam Curie did several experiments as a scientist.

Form nouns ending in ‘-er’ from the verbs in the list given below and give their meanings in the way the example does.

speak	speaker	one who speaks.
suffer	sufferer	one who suffers.
sweep	sweeper	one who sweeps.
teach	teacher	one who teaches.
drive	driver	one who drives a car, motor cycle, scooter etc.
observe	observer	one who observes.
borrow	borrower	one who borrows.
employ	employer	one who employs.
build	builder	one who builds.
rule	ruler	one who rules.

Write ten meaningful sentences from this table:

The young man Ram and Gopal The team The two brothers

worked hard practiced everyday played very cleverly

in order to

win the match come first

.

1. The young man worked hard in order to win the match.
2. Ram and Gopal worked hard in order to win the match.
3. The young man worked hard in order to come first.
4. Ram and Gopal worked hard in order to come first.
5. The young man practiced everyday in order to win the match.
6. Ram and Gopal practiced everyday in order to win the match.
7. The young man practiced everyday in order to come first.
8. Ram and Gopal practiced everyday in order to come first.
9. The team played very cleverly in order to win the match.
10. The two brothers played very cleverly in order to come first.

Rearrange the words in the following sentences and rewrite them to make meaningful sentences:

(a)  jobs/ lost/ Edison/ many/./

Sentence- Edison lost many jpbs.

(b)  the/ bet/ is/ what/?/

Sentence- What is the bet?

(c)  his/ worked/ till/ the very end/ Edison/ hard/ of/ life/./

Sentence- Edison worked hard till the very end of his life.

(d)  was/ lucky/ father/ how/ your/./

Sentence- How lucky was your father.

Talk to your partner and say ‘yes’ or ‘no’ and tick the correct option:

1.    Scientists and inventors have made the greatest contribution to mankind. (yes)

2.    Education is not necessary for all. (no)

3.    Telephone was invented by Graham Bell. (yes)

4.    Oxygen is not essential for living beings. (no)

5.    We should hurt the animals. (no)

6.    Playing and exercise are not good for health. (no)

7.    We should always try to speak the truth. (yes)

8.    Always help your friends and neighbours. (yes)

Write a paragraph on:

(1)          Electric bulb

Electric bulb was edison’s most important and useful invention. Edison worked for nearly two years to invent the first electric bulb. He spent about 40,000 dollars to find out the best material for making the filament. he tried many kinds of materials for the filament. At last , in 1879 he was able to produce the first electric bulb.

(2)          Gramophone

In 1877, Edison invented a talking machine. He called it phonograph. the phonograph was the first device for recording and replaying sound. The sound quality on phonograph was bad and each recording lasted for only one play. Later Alexander Graham Bell made improved gramophone which could be played many times.

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