12. A mixture of salt and sand can be separated by:
(a) Dissolving in water(b) Sublimation(c) Gravity separation(d) None of these
12. A mixture of salt and sand can be separated by: Read More »
11. PVC is obtained by the polymerization of :
(a) Vinyl chloride(b) Acetylene(c) Propene(d) Styrene
11. PVC is obtained by the polymerization of : Read More »
10. Combustion is the process in which:
(a) Heat is produced(b) Heat and light are produced(c) Light is produced(d) None of these
10. Combustion is the process in which: Read More »
9. Photosynthesis is:
(a) An exothermic process(b) An endothermic process(c) A neutral process(d) None of these
9. Photosynthesis is: Read More »
8. Cooking oil can be converted into vegetables ghee by the process of:
(a) Hydrogenation(b) Crystallization(c) Oxidation(d) None of these
8. Cooking oil can be converted into vegetables ghee by the process of: Read More »
7. In which of the following processes light energy is converted into chemical energy?
(a) Respiration(b) Photosynthesis(c) Fermenttio(d) Photorespirati
7. In which of the following processes light energy is converted into chemical energy? Read More »
6. A mixture of water and alcohol can be separated by:
(a) Filtration(b) Distillation(c) Evaporation(d) Decantation
6. A mixture of water and alcohol can be separated by: Read More »
5. Which of the following is a chemical change?
(a) Rusting of iron(b) Tempering of iron(c) Bending of iron(d) Melting of iron
5. Which of the following is a chemical change? Read More »
4. Rusting of iron involves:
(a) Reduction(b) Oxidation(c) Decomposition(d) Displacement
4. Rusting of iron involves: Read More »
3. What is condensation?
(a) Change of gas into solid(b) Change of solid into liquid(c) Change of vapour into liquid(d) None of these
3. What is condensation? Read More »