15. Which substance shows sublimation property?
a) Sugar
b) Salt
c) Camphor
d) Copper sulphate
Answer: c) Camphor
16. The ceramic candle in a water filter is used for:
a) Evaporation
b) Filtration
c) Distillation
d) Sublimation
Answer: b) Filtration
17. Water cycle in nature is an example of:
a) Evaporation
b) Condensation
c) Distillation
d) Filtration
Answer: c) Distillation
18. To separate a mixture of iron filings, sand and salt, how many methods are required?
a) One
b) Two
c) Three
d) Four
Answer: c) Three
19. Which method would you use to separate oil and water?
a) Filtration
b) Separating funnel
c) Evaporation
d) Sieving
Answer: b) Separating funnel
20. The process of separating cream from milk is based on:
a) Density difference
b) Magnetic properties
c) Size of particles
d) Solubility
Answer: a) Density difference
21. Which method is used to obtain pure water from seawater?
a) Filtration
b) Evaporation
c) Distillation
d) Decantation
Answer: c) Distillation
22. In threshing, separation is based on:
a) Size difference
b) Weight difference
c) Color difference
d) Shape difference
Answer: b) Weight difference
23. Which of these cannot be separated by sublimation?
a) Camphor
b) Ammonium chloride
c) Common salt
d) Naphthalene
Answer: c) Common salt
24. The method used to separate flour from bran is:
a) Hand-picking
b) Winnowing
c) Sieving
d) Threshing
Answer: c) Sieving
25. Which process involves both heating and cooling?
a) Filtration
b) Distillation
c) Decantation
d) Sieving
Answer: b) Distillation
26. Loading method makes impurities:
a) Float on water
b) Dissolve in water
c) Become heavier and settle down
d) Evaporate from water
Answer: c) Become heavier and settle down
27. Which property is used in hand-picking method?
a) Size
b) Shape
c) Color
d) Magnetic property
Answer: b) Shape
28. Filtration cannot separate:
a) Sand from water
b) Salt from water
c) Mud from water
d) Stones from water
Answer: b) Salt from water
29. Which method would you use to separate a mixture of salt and ammonium chloride?
a) Filtration
b) Sublimation
c) Crystallization
d) Evaporation
Answer: b) Sublimation
