Chemistry (Part-VII)

1. Which one of the following forms is the base of vegetable fibres? [S.S.C. Online Graduate Level (T-I) 9.09.2016]

(a) Cellulose
(b) Proteins
(c) Fats
(d) Oils

Correct Answer: (a) Cellulose

Solution:Cellulose - Cellulose is a complex carbohydrate that forms the main structural component of plant cell walls. Therefore, it is the fundamental base of most vegetable fibers like cotton, linen, and jute.

2. Which of the following fibres is considered the strongest natural fibre? [S.S.C. Online Graduate Level (T-I) 30.08.2016]

(a) Cotton
(b) Jute
(c) Wool
(d) Silk

Correct Answer: (d) Silk

Solution:

Silk - Silk, a natural protein fiber produced by certain insect larvae, is considered the strongest natural fiber due to its high tensile strength compared to its weight.

3. Rayon is obtained from which among the following? [S.S.C. Online CHSL (T-I) 8.03.2018]

(a) Silk
(b) Wood pulp
(c) Wool
(d) Cotton

Correct Answer: (b) Wood pulp

Solution:Wood pulp - Rayon is a regenerated cellulose fiber, meaning it is derived from natural cellulose sources, primarily wood pulp, which is chemically processed to create the fiber.

4. Which of the following is used as non-stick coating for cooking utensils? [S.S.C. Online Graduate Level (T-I) 10.09.2016]

(a) Perspex
(b) Styrofoam
(c) Polystyrene
(d) Teflon

Correct Answer: (d) Teflon

Solution:Teflon - Teflon, also known as polytetrafluoroethylene (PTFE), is a synthetic fluoropolymer that has excellent non-stick properties and is commonly used as a coating for cooking utensils.

5. Which of the following polymers is used in Insulating parts of electrical equipment? [C.P.O. 5.1. 11.06.2016]

(a) Orlone
(b) Teflon
(c) Bakelite
(d) Xylon

Correct Answer: (c) Bakelite

Solution:Bakelite is a plastic (polymer). It was discovered in the year 1907 by the Belgian-American chemist Leo Beechland. Bakelite is a chemical mixture of phenol and formaldehyde. It is used in insulating parts of electrical equipment.

6. What is Bakelite? [C.P.O. S.I. 6.06.2016]

(a) Solution
(b) Acid
(c) Base
(d) Polymer

Correct Answer: (d) Polymer

Solution:Polymer - Bakelite is a synthetic polymer, specifically a thermosetting plastic. It is formed by the polymerization reaction of phenol and formaldehyde.

7. Which of the following is used to make lightweight but strong plastics? [C.P.O. S.I. 6.06.2016]

(a) Nylon
(b) Polythene
(c) Polyvinyl chloride
(d) Methyl methacrylate

Correct Answer: (c) Polyvinyl chloride

Solution:Polyvinyl chloride (PVC) is known for its combination of lightweight and high strength, making it a suitable material for various applications. It's commonly used in pipes, plumbing, building materials, and even some clothing items.

8. Nylon threads are made of______. [S.S.C. Online Graduate Level (T-I) 4.09.2016]

(a) Polyester polymer
(b) Polyamide polymer
(c) Polyvinyl polymer
(d) Polysaccharide

Correct Answer: (b) Polyamide polymer

Solution:Nylon thread is a kind of polyamide polymer. It is obtained from diamine and dicarboxylic acid. Due to the variety of diamine and dicarboxylic acids found, many polyamide substances are added to obtain nylon fibers.

9. Which of the following is man-made fiber? [S.S.C. Online CHSL (T-I) 6.03.2018 ]

(a) Cotton
(b) Wool
(c) Silk
(d) Nylon

Correct Answer: (d) Nylon

Solution:Nylon - Nylon is a synthetic polyamide fiber, making it a man-made fiber. Cotton and wool are natural plant and animal fibers, respectively, and silk is a natural protein fiber produced by silkworms.

10. These fibers are used for making the hair of brushes__________. [S.S.C. Online CHSL (T-I) 11.01.2017]

(a) Kevlar
(b) Nylon 66
(c) Terylene
(d) Lexan

Correct Answer: (b) Nylon 66

Solution:Nylon 66 is used to make hair brushes. Nylon 66 is used when high mechanical strength, hardness, and good stability under heat, and chemical resistance is required. It is used for tying the edges of garments and carpets and the molded part in the middle.