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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