Separation of substances

What is the purpose for which we do

the separation?

• To remove non-useful components

• To separate two different, but useful components

• To remove impurities or harmful components

• All of the above

Which method is best suited for the separation of green vegetables from fried rice?

• Threshing

• Handpicking

• Filtration

• None of the above

Which one is the essential step that a farmer does with the stalks before threshing?

• Beat the stalks to free the grains

• Winnowing

• Drying of the stalks in the sun

• None of the above

Winnowing is used to separate:

• Stones from grains

• Husk particles from wheat Flour

• Chaff from wheat grains

• None of these

Wind or blowing air is required for the separation of substances in the method:

• Handpicking

• Filtration

• Sieving

• Winnowing

Before kneading the dough to make chapati/Parantha , your mother uses_____________ to remove impurities from the flour.

When the heavy solid particles in a mixture settle at the bottom of the vessel, this process is called:

• Filtration

• Sieving

• Sedimentation

• Decantation

Decantation is the process of pouring out the clear upper liquid by disturbing the sediments.

• True

• False

Meena accidentally spilled some oil into the water glass.

After leaving it undisturbed, which method of separation she can use to separate oil from water?

• Sedimentation

• Filtration

• Decantation

• Filtration and decantation

We obtain salt from the sea by using a method called

• Condensation

• Evaporation

• Decantation

• Filtration