Class VI Science 5

10 FILL IN THE BLANKS BITS

1. The method of handpicking is based on differences in size, colour, and shape of the particles.
2. The process of separating grains from stalks by beating is called threshing.
3. A soop (bamboo tray) is traditionally used during the process of winnowing.
4. Winnowing separates lighter husk from heavier grains using wind.
5. The method used to remove bran from wheat flour is sieving.
6. Sieving is used when solid components have different sizes.
7. Common salt is obtained from seawater by evaporation.
8. The settling of heavier insoluble particles is called sedimentation.
9. Removing liquid after sedimentation by tilting the vessel is decantation.
10. Separating iron nails from sawdust using a magnet is magnetic separation.

05 COMPETENCY BASED QUESTIONS WITH ANSWERS

1. Malli separates whole black peppers from pulao. Which method is used and when is it convenient?
   Answer:
   Malli uses handpicking. This method is convenient when unwanted particles are in small quantities and differ in size, colour, or shape.
2. Why is handpicking unsuitable for separating large amounts of husk from grains?
   Answer:
   Handpicking is time-consuming for large quantities. Farmers use winnowing, which uses wind to separate lighter husk from heavier grains.
3. How is bran removed from wheat flour while making meethi puri?
   Answer:
   The method used is sieving. Fine flour passes through the sieve, while larger particles like bran remain.
4. In what household activity are sedimentation and decantation used together?
   Answer:
   While washing rice and pulses, heavier grains settle by sedimentation and dirty water is removed by decantation.
5. What remains after salt solution dries on paper and which process causes it?
   Answer:
   Salt remains on the paper. Water disappears due to evaporation.

05 IMPORTANT QUESTIONS

1. Define handpicking, threshing, and winnowing, mentioning the property used in each.
2. Explain how common salt is obtained from seawater.
3. Differentiate between sedimentation and decantation with an example.
4. Explain magnetic separation and its uses in daily life.
5. Suggest a suitable sequence of methods to separate iron nails, sand, pepper, stones, salt, and wa