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The first synthetic fiber made by man was
1 Rayon
2 Nylon
3 Polyester
4 Terycott
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Which are known as non - luminous irregular nebulae?
Reaction of alcohol, with a carboxylic acid is known as 1 Substitution Reaction 2 Addition reaction 3 Esterification 4 Hydrogenation
meron po bang minerals ang astoroids po ba?
The element required for solar energy conversion is 1 Germanium 2 Silicon 3 Uranium 4 None of these
Which of the following is the lightest gas? 1 Nitrogen 2 Hydrogen 3 Ammonia 4 Carbon dioxide
which of the following fibers is generally preferred for making gauze and lint? 1 Cotton 2 Rayon 3 Nylon 4 Terylene
A moderator is used in nuclear reactors in order to 1 Increase the number of neutrons 2 Decrease the number of neutrons 3 Slow down the speed of neutrons 4 Accelerate the neutrons
why our head's weight not feel our body?
methane is not present in
Actinides are the elements with atomic numbers from 1 36 to 43 2 89 to 103 3 97 to 114 4 101 to 115
How many astronauts travelled in the challenger?
Which are the important pulsating nebulae?
Biological Sciences 
