All matter is made up of …….  A) very large particles 

Correct option is C) Collagen

Correct option is D) gold foil

Correct option is C) space

B) melting point

B) force of attraction

B) move continuously

A) A is true and R is false

Correct option is A) more

C) In gaseous state

1. All solids that settle during primary treatment are called primary sludge. 2. During secondary treatment the effluent is passed into a settling tank where the bacterial ‘floes’ are allowed to...