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706. Polythene is industrially prepared by the polymerization of

A. methane

B. styrene

C. acetylene

D. ethylene

Explanation:

707. Short sightedness is due to

A. shifting of the iris

B. weaker muscles

C. elongation of eye balls

D. weakening of the retina

Explanation:

708. Which of the following theories as regards the origin of life on earth is accepted today ?

A. Theory of spontaneous generation

B. Theory of special creation

C. Cosmozoic theory

D. Theory of abiogenesis

Explanation:

709. Which of the following is a physical basis of life ?

A. Mitochondria

B. Ribosome

C. Protoplasm

D. Nucleus

Explanation:

710. The first synthetic fibre made by man was

A. rayon

B. nylon

C. polyester

D. terycott

Explanation:

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