Separation of Substances

How are grain seeds removed from their stalks?

• Sieving

• Winnowing

• Threshing

• All of the above

What is a mixture?

• A chemical combination of two or more different substances.

• A physical combination of two or more different substances.

• A chemically pure substance.

• A special type of solution

When the solute dissolves into a solvent and disappears it is called a _____________.

• MIxture

• Solution

• Solvent

• None of the above

Pure substances are made up of the same kind of atoms.

• True

• False

Which of the following is not a homogeneous mixture?

• Oxygen in water

• Tea

• Sugar and water

• Fried rice

Lemonade is a special mixture called a

• substance

• solution

• plasma

• ingredient

A fruit salad is a

• solution

• mixture

Which of the following is essential to perform winnowing activity?

• Wind

• Water

• Magnet

• Filter paper

While preparing chapatis, Nitya found that the flour to be used was mixed with wheat grains. Which out of the following is the most suitable method to separate the grains from the flour?

• Threshing

• Sieving

• Winnowing

• Filtration

Hand picking method is effective in

• solid mixture

• Liquid mixture

• Gaseous mixture

• None of these