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COVID 19 ANGE MARGDARSHAN BABAT BISAG JOVA MAHTVAPURN LETTER

COVID 19 ANGE MARGDARSHAN BABAT BISAG JOVA MAHTVAPURN LETTER


11. Experts say that this might be the only chemical product ................using the same age old proportions and manufacturing techniques.
but
still 
yet
12. However, with the development of modern chemistry, light and colour effects have become common in fireworks.
effects 
effective
affects
13. Incandescent light is produced when a substance is ...............so much that it begins to glow.
heat
heating
heated 
14. Heat causes the substance .................. hot and glow.
become
to become
became
15. The .....................behind any firework is that when heat is applied to fuel (the gun powder), it burns using oxygen.
principal
principle 
principles
16. The .....................danger of pyrotechnics is that it deals with fire.
great
greater
greatest 
17. The industry is ........................for its accidents, whether in the U.S.A., Japan or India.
notorious 
notoriously
notoriety 
18. Scientists are looking ..................ways of making fireworks safer.
after
for
into
19. In India, fireworks .............be imported from China.
may
used to
should
20. During the Second World War, these imports were stopped.
importer
imports 
imported
________________________________
Answers
11. Experts say that this might be the only chemical product still using the same age old proportions and manufacturing techniques.
12. However, with the development of modern chemistry, light and colour effects have become common in fireworks.
13. Incandescent light is produced when a substance is heated so much that it begins to glow.
14. Heat causes the substance to become hot and glow.
15. The principle behind any firework is that when heat is applied to fuel (the gun powder), it burns using oxygen.
16. The greatest danger of pyrotechnics is that it deals with fire.
17. The industry is notorious for its accidents, whether in the U.S.A., Japan or India.
18. Scientists are looking for ways of making fireworks safer.
19. In India, fireworks used to be imported from China.
20. During the Second World War, these imports were stopped..