The gas usually causing explosions in coal mines is—

A). Hydrogen

B). Carbon monoxide

C). Air

D). Methane

Cotton fibers are made of—

A). Cellulose

B). Starch

C). Proteins

D). Fats

Which variety of glass is heat resistant?

A). Hard glass

B). Flint glass

C). Pyrex glass

D). Bottle glass

What are soaps?

A). Salts of Silicates

B). Ester of heavy fatty acids

C). Sodium or potassium salts of heavier fatty acids

D). Mixture of glycerol and alcohol

In which of the following processes light energy is converted into chemical energy?

A). Respiration

B). Fermentation

C). Photosynthesis

D). Photorespiration

Cooking oil can be converted into vegetables ghee by the process of—

A). Oxidation

B). Hydrogenation

C). Distillation

D). Crystallization

Photosynthesis is—

A). An exothermic process

B). An endothermic process

C). A neutral process

D). A thermostatic process

Enzymes are absent in—

A). Fungi

B). Bacteria

C). Viruses

D). Algae

The enzymes sucrose acts on—

A). Sucrose only

B). Sucrose and starch

C). All disaccharides

D). Any organic monomer

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