D:-alumina

Correct Answer:- Option-A
Question29:-The process of zinc coating over iron sheets by hot-dipping is called :

A:-galvanisation

B:-tinning

C:-sheradizing

D:-anodizing

Correct Answer:- Option-A
Question30:-Drying oils supply to paint film :

A:-main film-forming constituent

B:-medium or vehicle

C:-water-proofness

D:-all of these.

Correct Answer:- Option-D
Question31:-Butter is a colloidal sol containing :

A:-water dispersed in fat

B:-fat globules dispersed in water

C:-fat dispersed in casein

D:-suspension of casein in water

Correct Answer:- Option-A
Question32:-Tyndall effect is due to :

A:-absorption of light

B:-transmittance of light

C:-reflection of light

D:-scattering of light

Correct Answer:- Option-D
Question33:-The atomic number of an element is 9. During compound formation, it normally :

A:-gains 2 electrons

B:-loses 1 electron

C:-gains 1 electron

D:-losses 2 electrons

Correct Answer:- Option-C
Question34:-Nature of bonding in diamond is :

ക്ട

B:-covalent

C:-coordinate

D:-metallic

Correct Answer:- Option-B
Question35:-Silicon is used in transistors as :

A:-conductor

B:-insulator

C:-semiconductor

D:-capacitor

Correct Answer:- Option-C
Question36:-Most poisonous pollutant in water is :

A:-arsenic

B:-phosphate

(नयीत

D:-carbon dioxide

Correct Answer:- Option-A
Question37:-Bhopal gas tragedy in 1984 was caused by :

A:-carbonyl chloride

B:-carbon monoxide

C:-methyl cyanide

D:-methyl isocyanate

Correct Answer:- Option-D
Question38:-Which one of the following refractories is used in nuclear engineering as moderator?

A:-chromite bricks

B:-carborundum