There are times when we could not answer questions about maths, reasoning, but if our general knowledge and computer knowledge are good, we can score the number of maths, reasoning at that time. 

Water contains a bubble of air- concave lens
The reason for looking picturesque before sunrise- refraction of light
The reason for becoming rainbow- refraction

What will it look like if we see the sky from the moon- black
Which organ separate urea from the body- kidney
The colour of the human skin is formed – due to menaline
Raw fruits are used for cooking- acetylene
Why is the bite of honeybee, ant, scorpion causes irritation and itching- due to formic acid
Produces vitamin D for the body-our skin
Which vitamin is found in sunlight- D, K

Artificial rainfall occurs- due to silver iodide
Salk vaccine is applied for which disease-  polio 
What causes water to be spherical - due to friction
Which metal is found in liquid form- mercury
Which part of the body is affected by jaundice- liver

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