Seperation of Substances

What is the purpose of separating substances in a mixture?

• b) To remove harmful or non-useful substances
• d) To add new substances
• c) To make the process more complicated
• a) To increase the volume of the mixture

Which method is used to remove stones from rice or wheat?

• Handpicking

• a) Winnowing
• Evaporation

• Filtration

What process is used to separate butter from milk?

• Whipping
• Boiling
• Fermenting
• Churning

What is the purpose of using a strainer while preparing tea?

• To separate tea leaves from the brewed tea.
• To add sugar to the tea.
• To cool down the tea quickly.
• To enhance the flavor of the tea.

The process of separating grains from stalks is called:

• threshing
• sowing
• plowing
• harvesting

What method is used to separate husk from grain using wind?

• Winnowing
• Crushing
• Milling
• Threshing

Which of these separation methods is used in flour mills?

• a) Sieving
• Filteration

• winnowing

• Decantation

Which process is used to separate heavier solid particles from a liquid?

• Winnowing

• Decantation

• Filtration

• Evaporation

What is filtration mainly used for?

• d) Filtering air pollutants
• a) Separating gases from liquids
• c) Enhancing chemical reactions
• b) Separating insoluble solids from liquids

What method is commonly used to obtain salt from seawater?

• Freezing
• Filtration
• Distillation
• Evaporation