CHEMICAL ENGINEERING

Question: Materials having resistivity ranging from 1 to 100 ohm. cm is termed as
[A].

conductor

[B].

insulator

[C].

semi-conductor

[D].

none of these

Answer: Option C

Explanation:

No answer description available for this question.

Question: Increasing the temperature of a material makes it
[A].

harder

[B].

softer

[C].

tougher

[D].

stronger

Answer: Option B

Explanation:

No answer description available for this question.

Question: While the thermosetting polymers are amorphous in nature, the thermoplastic polymers are either amorphous or crystalline. The crystalline polymers are characterised by the
[A].

low impact strength.

[B].

high flexibility.

[C].

better finish and surface appearance.

[D].

high plastic deformation.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Which of the following polymers is obtained by copolymerisation of three monomers ?
[A].

SAN

[B].

ABS

[C].

SBR

[D].

PTFE

Answer: Option B

Explanation:

No answer description available for this question.

Question: Window panes of aeroplanes are normally made of
[A].

perspex (PMMA)

[B].

teflon (PTFE)

[C].

bakelite (phenol formaldehyde)

[D].

polystyrene

Answer: Option A

Explanation:

No answer description available for this question.

Question: __________ is the hardest oxide and is hence used where high wear resistance at high temperature is required.
[A].

Beryllia

[B].

Zirconia

[C].

Alumina

[D].

Magnesia

Answer: Option C

Explanation:

No answer description available for this question.

Question: Even though heat transfer co-efficients in boiling liquids is large, use of fins is advantageous, when the entire surface is exposed to __________ boiling.
[A].

film

[B].

nucleate

[C].

transition

[D].

all modes of

Answer: Option A

Explanation:

No answer description available for this question.

Question: Out of the following surfaces, the emis-sivity will be minimum for
[A].

aluminium foil

[B].

concrete

[C].

plaster

[D].

smooth glass

Answer: Option B

Explanation:

No answer description available for this question.

Question: Material having negative co-efficient of linear expansion is
[A].

copper

[B].

aluminium

[C].

rubber

[D].

nickel

Answer: Option C

Explanation:

No answer description available for this question.

Question: __________ is a special constituent of chlorophyll without which photosynthesis is not possible.
[A].

Calcium

[B].

Nitrogen

[C].

Phosphorous

[D].

Hydrogen

Answer: Option B

Explanation:

No answer description available for this question.