GATE XE 2021 Paper 1 — page 39

Questions 115–117 of 175. Imported answers require review unless explicitly marked reviewed.

Polymer crystals show a range of melting points in contrast to single melting point of crystals of small molecules, because ________.

Your answerChoose one option.

there is an absence of intermolecular interactions

there is an absence of long range ordering

the polymer chains are not in thermodynamic equilibrium in a metastable state

the melting behavior of polymer crystal is independent of sample thermal history

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

When the rate of cooling is increased during the solidification process, the glass transition temperature of a polymer ________.

Your answerChoose one option.

decreases

increases

stays unaltered

shows a non-monotonic dependence

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Equal and opposite forces of a constant magnitude

are applied at the two ends of a thin elastomeric rod, which is held at a temperature

(

), where

and

are the glass transition temperature and melting temperature respectively. If the temperature is increased to

(

and

), the rod will ____________.

Your answerChoose one option.

expand along the loading direction and the transverse direction

shrink along the loading direction

remain dimensionally unaltered

expand only along the loading direction

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

2021 · Paper 1