Question 1

Identify the method of separation

Accepted Answer

WINNOWING

Answer

SIEVING

Answer

HANDPICKING

Question 2

Define this process

Accepted Answer

The process of separating grains from stalks is called threshing.

Question 3

What do understand by the term saturated solution?

Accepted Answer

A solution which cannot dissolve more solute at a given temperature.

Question 4

How is sedimentation different from decantation?

Accepted Answer

The process of settling down of heavier insoluble substances in liquid is sedimentation. The process of transferring liquid from one vessel to another after sedimentation without disturbing the sediments is called decantation.

Question 5

Which substances can be separated using the above device?Explain with example

Accepted Answer

When two liquids are immiscible then separating funnel can be used. For example the oil separates and floats as a layer on the top as they are less denser than water so by using separating funnel we can separate both oil and water.

Question 6

Name the methods involved in separating solid from solid mixtures

Accepted Answer

1. Hand picking   2. Threshing      3. Winnowing      4.  sieving

Question 7

What do you mean by loading?

Accepted Answer

The process of making light particles heavy by adding particles of other substances( such as alum) so that they settle down faster is called loading.

Question 8

You may have observed that the sky becomes clear after first rain. Can you explain why?

Accepted Answer

Sky becomes clear after first rain because the dust particles in the atmosphere settles down with the rain drops through the process of loading. So, sky appears clear and bright. After a rain clouds lose all their water droplets resulting in loss of the collection of water condensed and settled on dirt particles.

Question 9

Solubility of a salt increases with ________________________ in temperature.

Accepted Answer

Increase

Question 10

Air is mixture of ________________(Choose the correct option)  a) Liquid  b) Vapours   c) solids    d) Gases

Accepted Answer

Gases

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