ECAT Chemistry — Macromolecules
Macromolecules is part of the Chemistry section of the UET ECAT (30 of the 100 MCQs). It breaks into 2 subtopics, and we hold 17 ECAT-pattern practice MCQs on it, each with a written explanation. Tap a subtopic below to practise just that.
Subtopics (2)
How Macromolecules is tested
Across the 7 ECAT past papers on ParhaiKrlo, Macromolecules accounts for 9 questions. It appears in 6 of them, about 1.5 questions a paper. The heaviest was ECAT Past Paper 02, with 3 questions, and the most recent is ECAT Past Paper 07, with 1.
| Paper | Questions |
|---|---|
| ECAT Past Paper 07 | 1 |
| ECAT Past Paper 06 | 1 |
| ECAT Past Paper 04 | 1 |
| ECAT Past Paper 03 | 2 |
| ECAT Past Paper 02 | 3 |
| ECAT Past Paper 01 | 1 |
Macromolecules MCQs from the ECAT past papers
Try each one before opening the answer. Each comes with a short explanation.
- Q1 · ECAT Past Paper 07 · Macromolecules
An important property of the polymer of PVC pipes is that it:
- A.Decomposes when heated
- B.Becomes hard on heating and cannot be softened again
- C.Can be softened on heating and hardened on cooling, with drastically different properties
- D.Can be softened repeatedly on heating and hardened on cooling with little change in properties
Show answer
Answer: D. Can be softened repeatedly on heating and hardened on cooling with little change in properties — PVC is a thermoplastic: it can be remoulded many times.
- Q2 · ECAT Past Paper 06 · Macromolecules
Which of the following is a natural polymer?
- A.Terylene
- B.Polysaccharide
- C.Nylon
- D.Polyethene
Show answer
Answer: B. Polysaccharide — Polysaccharides (starch, cellulose) are made by living things; the others are synthetic.
- Q3 · ECAT Past Paper 04 · Macromolecules
Which of the following are examples of polymers?
- A.Rubber
- B.Proteins
- C.Cellulose
- D.All of the above
Show answer
Answer: D. All of the above — Natural rubber (polyisoprene), proteins (polyamides of amino acids) and cellulose (polyglucose) are all polymers.