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
