Ch – 3 Synthetic Fibres & Plastics

Q.1: Cellulose is made up of large number of ____________ units.

a) fats

b) proteins

c) glucose

Q.2: Nylon was first made in _________ using coal, water and air.

a) 1931

b) 1945

c) 1928

Q.3: Polyester is made up of repeating units of a chemical called ___________.

a) methane

b) ester

c) yester

Q.4: Which of the following statements is incorrect about synthetic fibres ?

a) They are expensive.

b) They are available in different colours.

c) They are durable.

Q.5: Which of the following are the examples of thermosetting plastics ?

a) bakelite and melamine

b) PVC and polythene

c) Both

Q.6: The uniforms of firemen have a coating of ___________ to make them fire resistant.

a) PVC

b) bakelite

c) melamine

Q.7: The approximate time taken by a cotton cloth to degrade is _______________.

a) 10 to 30 days

b) 2 to 5 months

c) 5 to 6 months

Q.8: ___________ plastic is used for nonstick coating on cookwares.

a) Teflon

b) Bakelite

c) Melamine

Q.9: Which of the following statements are correct about “Rayon” ?

i) It is obtained by chemical treatment of wood pulp.

ii) It is mixed with cotton to make bedsheets.

iii) It is not a man-made fibre.

a) i and ii

b) ii and iii

c) i and iii

Q.10: _____________ are the chemicals which give fruits their smell.

a) ethane

b) ester

c) melamine

Q.11: Why is melamine considered as a versatile material ?

a) Because it resists fire.

b) Because it tolerates heat better than other plastics.

c) Both

Q.12: _____________ is a poor conductor of heat and electricity that’s why it is used to make electrical switches.

a) Teflon

b) PVC

c) Bakelite

Answers:

Q.1: Cellulose is made up of large number of ____________ units.

a) fats

b) proteins

c) glucose

Q.2: Nylon was first made in _________ using coal, water and air.

a) 1931

b) 1945

c) 1928

Q.3: Polyester is made up of repeating units of a chemical called ___________.

a) methane

b) ester

c) yester

Q.4: Which of the following statements is incorrect about synthetic fibres ?

a) They are expensive.

b) They are available in different colours.

c) They are durable.

Q.5: Which of the following are the examples of thermosetting plastics ?

a) bakelite and melamine

b) PVC and polythene

c) Both

Q.6: The uniforms of firemen have a coating of ___________ to make them fire resistant.

a) PVC

b) bakelite

c) melamine

Q.7: The approximate time taken by a cotton cloth to degrade is _______________.

a) 10 to 30 days

b) 2 to 5 months

c) 5 to 6 months

Q.8: ___________ plastic is used for nonstick coating on cookwares.

a) Teflon

b) Bakelite

c) Melamine

Q.9: Which of the following statements are correct about “Rayon” ?

i) It is obtained by chemical treatment of wood pulp.

ii) It is mixed with cotton to make bedsheets.

iii) It is not a man-made fibre.

a) i and ii

b) ii and iii

c) i and iii

Q.10: _____________ are the chemicals which give fruits their smell.

a) ethane

b) ester

c) melamine

Q.11: Why is melamine considered as a versatile material ?

a) Because it resists fire.

b) Because it tolerates heat better than other plastics.

c) Both

Q.12: _____________ is a poor conductor of heat and electricity that’s why it is used to make electrical switches.

a) Teflon

b) PVC

c) Bakelite

Published by Priya Prakash

In the midst of winter, i found there was within me an invincible summer ~ Albert Camus

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

%d bloggers like this: