Separation of Substances

What involves beating the harvested crops to separate the grains?

• Threshing

• Winnowing

• Sieving

• Hand-picking

Sieving is used for separating two substances with ---------- sizes.

• Different

• Same

Threshing is used to separate

• Chaff from grain

• Stones from grain

• Sand from grain

• Grains from stalks

Which of the following methods is used to separate stones from grains?

• Threshing

• Winnowing

• Hand-picking

• Sieving

A machines that reaps, threshes and cleans the crop

• Combine harvester

• Sieve

The method used to separate chaff from the grain by wind or blowing air

• Winnowing

• Sieving

What plays an important role in the process of winnowing?

• Direction of wind

• Grains from stalks

• Fodder for cattle

• None of these

Name the process used for the separation of the following:

Wheat grains from stalks

• Threshing

• Winnowing

• Hand-picking

• Sieving

Name the process used for the separation of the following:

Wheat bran from flour

• Sieving

• Evaporation

• Condensation

• Hand-picking

The method used to separate chaff from the grain by wind or blowing air is called ---------