Which of the following additives are added to plastics to make it impervious to X-rays?

Which of the following additives/water proofing agents is added to lower the hydrophilic (moisture loving) characteristic of cement?

A

Xanthates

B

Stearic acid

C

Calcium & aluminium stearate

D

Formic acid

In each of the following questions, out of the given alternative, select the word which is closest to the opposite in meaning. IMPERVIOUS

A

Penetrable

B

Hidden

C

Tolerable

D

Gentle

Coating of solid waste with impervious material is known as

A

Encapsulation

B

Chemical fixation

C

Landfill

D

Capping

The most suitable material for the central impervious core of a zoned embankment type dam is

A

clay

B

coarse sand

C

silty clay

D

clay mixed with fine sand

Plasticisers are added to synthetic plastics to

A

Impart flexibility

B

Improve workability during fabrication

C

Develop new improved properties not present in the original resin

D

All of the above

Which of the following additives improves the cetane number of diesel?

A

Amyl nitrate

B

Ethyl mercaptan

C

Napthenic acid

D

Tetra ethyl lead

Many food additives cause cancer

A

added substances

B

dangerous substances

C

natural substances

D

additional substances

Many food additives cause cancer.

A

natural substances

B

dangerous substances

C

added substances

D

additional substances .

Many food ‘additives’ cause cancer.

A

natural substances

B

dangerous substances

C

added substances

D

additional substances

Pick out the correct combination about the role of various additives used in polymers.

A

Plasticiser : increases the polymer strength

B

Heat stabiliser : increases the maximum service temperature

C

Fillers: Does not affect the property of polymer but increases its weight

D

Lubricants: increases the flexibility of polymers

Which of the following additives are added to plastics to make it impervious to X-rays?

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