Read and understand carefully each question . Encircle the letter of the correct answer.
1. Which of the following techniques is best to separate soil and water?
A. Decantation C. Sieving
B. Distillation D. Magnetism
2. _________ is used to separate salt from water.
A. Distillation C. Floatation
B. Evaporation D. Chromatography
3. Why can water be separated from heavy objects?
A. because of decantation C. because of sedimentation
B. because of winnowing D. because of filtration
4. Which is the correct order for obtaining salt from a mixture of sand and salt ?
A. Dissolving in water-evaporation C. Filtration- dissolving in water- dissolving in
water
B. Evaporation -filtration -dissolving in water D. Dissolving in water- filtration -evaporation
5. Which method is used to separate colored substances from each other?
A. Chromatography C. Distillation
B. Evaporation D. Filtration
6. Which of the following environmental problems can be separated by physical means.
A. Oil spill C. Garbage in landfills
B. Floodwater D. Smog
7. In filtration, the filtered liquid is called the________ .
A. Residue C. Filtrate
B. Precipitate D. Supernatant
8. It is a way or technique of separating light and heavy objects using the force of the wind .
A. Handpicking C. Winnowing
B. Evaporation D. Sedimentation
9. Two materials being separated by sieving or sifting differs in ______.
A. Shape C. Phase
B. Weight D. Size
10. In evaporation , ____________becomes ________________after being heated.
A. Water- Vapor C. Water – Sediments
B. Water-Residue D. Water- Supernatant