Question

Which Method Is Used To Separate Pebbles and Stones From Sand?

• A. Winnowing
• B. Sieving
• C. Hand Picking
• D. Any of these

Answer 1

The correct option is B

Sieving

Explanation for the correct option:

(B) Sieving

• Sieving is the use of a sieve to separate tiny particles from larger particles.
• It is found in grain mills and on construction sites. Impurities such as husks and stones are removed from wheat in the flour mill.
• Sieving is used to separate pebbles and stones from sand.

Explanation for the incorrect option:

(A) Winnowing

• Chaff and grain are separated by the process of winnowing.
• It can be used to clean bugs out of the grain that has been stored.
• When preparing grains, winnowing often comes after threshing.
• Using shovels and a sieve, the dry grains are made to fall from a height in the traditional method of winnowing.

(C) Hand Picking

• The hand-picking method is a way to separate ingredients in a combination by simply selecting them out of the mixture with your hands.
• It is one of the many techniques that are used in arid environments.

(D) Any of these

• Separation of sand from the mixture of pebbles and stones can only be done by sieving
• Hand-picking can all also be used in this separation but it requires big stones which can be easily picked.
• Winnowing is normally used in flour mills to separate bugs.

Therefore, the correct option is (B) Sieving