Question

Fill in the blanks with appropriate words:​

(i) Small pieces of stone can be removed from rice by
(ii) are obtained from stalks by threshing.​
(iii) Husk from wheat flour is generally removed by​.
(iv) The process of settling of heavier particles is called
(v) Filtration is helpful in separating an insoluble from ​​​​​​​

Answer 1

(i)
Handpicking is a separation technique used to remove the unwanted impurities from the mixture by hand. Thus-​

Small pieces of stone can be removed from rice by handpicking.​

​(ii)
The process of beating out the grains from the harvested crop plants is called threshing. The grains or seeds are separated from the chaff, by this method. Thus-​
Grains are obtained from stalks by threshing.​

(iii)
Sieving is a simple technique for separating particles of different sizes.​

Thus-
Husk from wheat flour is generally removed by sieving. ​

(iv)

Sedimentation is the process of allowing particles in suspension in water to settle out of the suspension under the effect of gravity. Thus-​

The process of settling of heavier particles is called sedimentation ​

(v)
Filtration is helpful in separating an insoluble solid from a liquid.​