NEET (UG)

Practice Test 1 — Polymers

12 questions • 18 minutes • auto-graded with full solutions

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Section A — MCQ (Single Correct & Statement-based)

Question 1

The repeating units of a polymer are:

Solution: Monomers make up the polymer.

Question 2

Which forms by condensation polymerisation?

Solution: Nylon-6,6 loses water (condensation).

Question 3

The monomer of PVC is:

Solution: Vinyl chloride.

Question 4

Statements: (I) Bakelite is a thermosetting polymer. (II) Bakelite can be remoulded on heating. Which is/are correct?

Solution: I correct; II wrong — thermosetting polymers cannot be remoulded.

Question 5

Natural rubber is:

Solution: cis-1,4-polyisoprene.

Question 6

Vulcanisation cross-links rubber chains using:

Solution: Sulphur forms the cross-links.

Question 7

Which polymer is biodegradable?

Solution: PHBV is biodegradable.

Question 8

Terylene is a:

Solution: Terylene (PET) is a polyester.

Section B — Assertion & Reason

Question 9

A: Nylon-6,6 is formed by condensation polymerisation.
R: Its monomers each have two functional groups and a small molecule (water) is eliminated as they join.

Solution: Loss of water from bifunctional monomers is the definition of condensation — R explains A.

Question 10

A: Vulcanised rubber is stronger and more elastic than natural rubber.
R: Sulphur introduces cross-links between the rubber chains.

Solution: The sulphur cross-links are exactly what improve the rubber — R explains A.

Question 11

A: Polythene can be softened and remoulded on heating.
R: Polythene is a thermoplastic polymer.

Solution: Being a thermoplastic is exactly why polythene can be remoulded — R explains A.

Question 12

A: Teflon is formed by addition polymerisation.
R: Its monomer, tetrafluoroethene, is unsaturated and adds without losing any by-product.

Solution: An unsaturated monomer adding with no by-product is addition polymerisation — R explains A.