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1. What is the main principle behind sieving?
A. Size difference between particles
B. Magnetic properties
C. Density difference
D. Color difference
2. Which method is commonly used to separate salt from water?
A. Filtration
B. Evaporation
C. Sieving
D. Handpicking
3. What process can be used to separate pebbles from sand?
A. Sieving
B. Winnowing
C. Decantation
D. Filtration
4. Churning is used to separate:
A. Water from oil
B. Butter from curd
C. Grains from husk
D. Iron from sand
5. Which method is used when two components of a mixture have different sizes?
A. Sedimentation
B. Winnowing
C. Sieving
D. Magnetic separation
6. Sedimentation is useful for separating:
A. Butter from curd
B. Sand from water
C. Husk from grains
D. Iron from sand
7. What is the residue left behind after filtration called?
A. Filtrate
B. Waste
C. Sediment
D. Solid
8. Which of the following processes uses wind or air?
A. Threshing
B. Winnowing
C. Filtration
D. Churning
9. Which of the following is an example of handpicking?
A. Removing stones from rice
B. Filtering tea leaves
C. Extracting salt from seawater
D. Separating oil from water
10. What type of mixture can be separated by filtration?
A. Two liquids
B. Soluble solid and liquid
C. Insoluble solid and liquid
D. Two gases
11. What process would you use to separate iron from a heap of waste materials?
A. Handpicking
B. Filtration
C. Magnetic separation
D. Evaporation
12. Decantation is not useful for separating:
A. Oil from water
B. Sand from water
C. Iron from sand
D. Pebbles from water
13. Which method is used to remove bran from flour?
A. Threshing
B. Winnowing
C. Sieving
D. Filtration
14. What is the process of separating butter from buttermilk called?
A. Decantation
B. Sieving
C. Churning
D. Magnetic separation
15. Magnetic separation is commonly used in:
A. Kitchen
B. Construction sites
C. Recycling centers
D. Schools
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