9. Methods of Separation in Everyday Life

What is the method of picking small stones from grains by hand called?

• Winnowing
• Sieving
• Threshing
• Handpicking
• Evaporation

Answer explanation

Jupiter is a gas giant made primarily of hydrogen and helium. Unlike terrestrial planets that have solid surfaces, gas giants like Jupiter don't have a well-defined solid surface, allowing them to accumulate more mass in a gaseous form. This composition has allowed Jupiter to grow significantly larger than planets with solid surfaces.

Handpicking is done on the basis of differences in:

• Taste and smell
• Size, colour, and shape
• Weight and density
• Magnetic properties
• Solubility

Handpicking is a convenient method when the particles to be removed are:

• Present in large quantities
• Very small
• Present in small quantities and easily picked
• Mixed with liquids
• Dissolved in the mixture

What is the process of separating grains from stalks called?

• Winnowing
• Sieving
• Threshing
• Handpicking
• Filtration

In the story, how were the farmers beating the stalks to separate grains?

• Using a machine
• Using their hands
• On a large wooden log
• By throwing them in the air
• By soaking them in water

What mixture did Malli and Valli observe after threshing?

• Grains and small stones
• Grains and husk
• Husk and stalks
• Stalks and stones
• Flour and bran

In Activity 9.1, what happens when you rub roasted peanuts between your palms?

• They dissolve
• The skin comes off
• They become powder
• They stick together
• They change colour

Blowing air separates the components of a mixture based on:

• Their colour
• Their weight (heavier and lighter)
• Their shape
• Their taste
• Their magnetic properties

What is the traditional bamboo tray used for winnowing called?

• Sieve
• Soop
• Thresher
• Plate
• Bowl

The method of separating heavier and lighter components by wind is called:

• Sieving
• Threshing
• Handpicking
• Winnowing
• Decantation