Seperation of Substances

Which of the following methods can we use to separate grain seeds from stalks?

• Winnowing

• Threshing

• Hand-picking

• Filtration

Answer explanation

In the process of threshing, the stalks are beaten to free the grain seeds.

Which of the following mixtures can be separated by the method of filtration?

• Oil in water

• Cornflakes in milk

• Salt in water

• Sugar in milk

Answer explanation

The salt particles will get stuck in the filter paper while the water passes through.

Which method is the most suitable to separate grain from flour?

• Threshing

• Sieving

• Winnowing

• Filtration

Answer explanation

A sieve will let the fine flour particles pass through the sieve while the grain seeds get stopped by the sieve.

The process of settling heavier particles in water is called ________.

• Decantation

• Winnowing

• Distillation

• Sedimentation

Answer explanation

The process of solid impurities settling down in water is known as sedimentation.

A mixture of oil and water can be separated by filtration. 

• True

• False

Answer explanation

The given statement is false because none of the two components, neither oil nor water will get stuck to the filter paper.

A _______ solution does not dissolve more of the solute in it.

• Saturated

• Desaturated

• Transparent

• None of these

Answer explanation

A saturated mixture has no space left between its molecules to dissolve more of the solute in it.

Filtration is a method to separate the components of a

• Solution of a two insoluble liquid impurities.

• Mixture of a liquid and insoluble solid impurity

• Pure substances

• Heavier and lighter components of a mixture

Answer explanation

A liquid and an insoluble solid impurity is separated by the method of filtration. The solid impurities get stuck to the filter paper.

Threshing is done by

• Beating

• Bullocks

• Machines

• All of these

Answer explanation

Threshing is done by all the three methods, beating, bullocks and on machines!

The solution of salt in water can be separated by

• Decantation

• Sedimentation

• Distillation

• Winnowing

Answer explanation

The water will evaporate, leaving behind the salt. The water can then be condensed.

How can we separate beans from chickpeas?

• Handpicking

• Winnowing

• Threshing

• Sieving