Multiple Choice QuestionsConsider the following statements.
1.Thermoplastic polymers are formed by condensation polymerisation.
2.Thermosetting polymers can be remoulded or reshaped.
3. Nylon-6 is also known as perlon-L.
4. Glyptal is a thermosetting plastic.
The wrong statement(s) is/are
1 and 3
2 and 4
1 and 2
3 and 4
B.
2 and 4
Statement (1) and (3) are correct while statement (2) and (4) are wrong statements.
Statement (2) Thermosetting polymer cannot be remoulded and reshaped by repeated heating as it become hard on heating.
Statement (4) Glyptal is a thermoplastic polymer. It getsoften on heatmg and becomes hard on colling. It is used in paints and varnishing.
Match List-l with List-II and select the correct answer using the codes given below:
| List I | List II |
| A. Polyesters | 1. Buna-S |
| B. Polyamides | 2. Orlon |
| C. Polydienes | 3. Terylene |
| D. Polyacrylates | 4. Nylon-6 |
Codes:
A B C D
1 2 3 4
A B C D
3 4 1 2
A B C D
4 3 2 1
A B C D
1 3 4 2
Dacron is obtained by the condensation polymerisation of
Dimethyl terephthalate and ethylene glycol
Terephthalc acid and formaldehyde
Phenol and phthalic acid
Phenol and formaldehyde
Three dimensional molecules with cross links are formed in the case of a
thermoplastic
thermosetting plastic
Both (a) and (b)
None of the above
The monomers of buna-S rubber are
vinyl chloride and sulphur
butadiene
styrene and butadiene
isoprene and butadiene
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