4.Acrylic fibres are also known as
a)Terry cot
b)Orlon
c)Polyester
d)None of these

B

Explanation:

DuPont created the first acrylic fibers in 1941 and trademarked them under the name Orlon.

explanation: it gains negative electrons, therefore becoming negatively charged. as charge cannot be created, nor destroyed, only transferred, this leaves the wool positive. now that they have opposite charges, the two items attract.