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