separation of substances

Which process of separation requires wind ?

• threshing

• sieving

• hand picking

• winnowing

In what cases we find the method of Handpicking convenient?

• When there is less quantity of impurities

• when we need to separate only rice and stones

• When the size of impurities are big

• When there is only a small quantity and impurities of small size

Which method of Separation is used to separate sand from sawdust?

• Hand picking

• Winnowing

• Sieving

• Filtration

What can be separated by Sieving?

• Stones from grains

• Husk from wheat

• Small impurities from water

• Grains from stalks

We filter impurities using a :-

• Windmill

• Spoon

• Bullock cart

• Filter paper

Threshing can be used for :

• Separating grains from stalks

• Separating leaves from tea

• Separating honey from water

What do you mean by lustre ?

• Shining

• Rust

• Dark

• Types of metal

Which of the following types of materials are compressable ?

• hard

• soft

Which of the following materials have lustre ?

• Cotton ball

• Plastic

• Metal

• Paper

What is the name of the process for conversion of water into vapour?

• Decantation

• Vaporization

• Filtration

• Churning