Chemical Process MCQs

Question 1

Pasteurisation of milk means

Accepted Answer

Killing of organisms present in it by heating it at controlled temperature without changing its natural characteristics

Answer

Removal of fatty and albuminous substance from it

Answer

Inhibiting the growth of micro-organisms without killing them

Answer

None of these

Question 2

Argon is the third largest constituent of air (followed by N2 & O2). Its percentage by volume in air is

Accepted Answer

0.94

Answer

0.14

Answer

0.34

Answer

1.4

Question 3

Pick out the true statement pertaining to water treatment.

Accepted Answer

Normally, the turbidity is removed by adding a coagulent prior to sedimentation

Answer

Slow sand filters can remove colour completely

Answer

Activated carbon can be used for taste & odour control without subsequent filtration

Answer

Application of activated carbon reduces the temporary hardness of water

Question 4

Pick out the false statement pertaining to water treatment.

Accepted Answer

The zeolite water softening process reduces the hardness of water by not more than 50%

Answer

Aeration of water is effective in CO2 removal

Answer

Sodium sulphate or sodium carbonate do not cause hardness in water

Answer

Water with pH value less than 7, is acidic

Question 5

Phenol formaldehyde

Accepted Answer

Employs condensation polymerisation

Answer

Employs addition polymerisation

Answer

Is a monomer

Answer

Is an abrasive material

Question 6

Phenol is mainly used

Accepted Answer

To produce phenol formaldehyde

Answer

To produce benzene

Answer

To produce polyester resin

Answer

As a plasticiser for unsaturated polyster

Question 7

Phthalic anhydride is used

Accepted Answer

As plasticisers

Answer

In making PVC

Answer

In insecticides manufacture

Answer

For making nylon-6

Question 8

Pick out the wrong statement.

Accepted Answer

None of these

Answer

Azoic dyes are mostly applied on cotton fabrics

Answer

Basic dyes (e.g. amino derivatives) are applied mostly to paper

Answer

Mordant dyes are applied mainly to wools

Question 9

Plaster of Paris is4

Accepted Answer

Both A and B

Answer

CaSO4 .$$\frac{1}{2}$$H2O

Answer

Used for setting of broken bones

Answer

Same as gypsum