Question

Wheat flour can be separated from the wheat bran by:

• A. hand picking
• B. sieving
• C. winnowing
• D. filtration

Answer 1

The correct option is B sieving

• Hand-picking is used to separate slightly larger-sized impurities such as stones, pieces of dirt, etc. This method is used when the quantity of impurities is very less. We cannot separate wheat bran from wheat flour as wheat bran is very small in size and it cannot be hand-picked.
• Winnowing is used to separate heavier and lighter components of a mixture by wind or by blowing air. But wheat flour and wheat bran do not have considerable weight differences therefore, winnowing cannot be used to separate them.
• Sieving is a physical method used for the separation of particles based on their sizes. Wheat flour is separated from bran by using the sieving method because wheat flour particles are finer than wheat bran. Therefore, sieving is used to separate wheat flour and wheat bran.
• Filtration is used to separate components of a mixture of an insoluble solid and a liquid. Wheat flour and wheat bran both are solid particles therefore filtration cannot be used to separate them.

So, the correct answer is sieving.