Paheli bought some vegetables such as french beans, lady's finger, green chillies, brinjals and potatoes all mixed in a bag. Which of the following methods of separation would be most appropriate for her to separate them?

1

(a)

Winnowing

(b)

Sieving

(c)

Threshing

(d)

Handpicking

Which of the following mixtures would you be able to separate using the method of filtration?

1

(a)

Oil in water

(b)

Cornflakes in milk

(c)

Salt in water

(d)

Sugar in milk

In an activity, a teacher dissolved a small amount of solid copper sulphate in a tumbler half-filled with water. Which method would you use to get back solid copper sulphate from the solution?

1

(a)

Decantation

(b)

Evaporation

(c)

Sedimentation

(d)

Condensation

Paheli asked for a glass of water from Boojho. He gave her a glass of ice cold water. Paheli observed some water droplets on the outer surface of the glass and asked Boojho, how these droplets of water were formed? Which of the following should be Boojho's answer?

1

(a)

Evaporation of water from the glass

(b)

Water that seeped out from the glass

(c)

Evaporation of atmospheric water vapour

(d)

Condensation of atmospheric water vapour

Most of the substances present around us are:

1

(a)

Pure substances

(b)

Mixtures

(c)

Impure substances

__________________is separated from milk by churning

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(a)

Cream

Common salt is obtained from seawater by_________________

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(a)

evaporation

The method of separating seeds of paddy from stalks is called__________________

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(a)

threshing

Centrifugation is used to separate ________ milk.

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(a)

cream

Common salt is made by ____ of sea water.

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(a)

evaporation

Sharbat is a mixture of sugar and water.

1

(a) False

(b) True

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

1

(a) True

(b) False

Separation of sugar from tea din be done with filtration.

1

(a) True

(b) False

A mixture of iron filings and rice flour can be separated by magnet.

1

(a) False

(b) True

A mixture of chalk and water is separated by winnowing.

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(a) True

(b) False

What is unsaturated solution?

1

(a)

If a solution can further dissolve more solute, it is known as unsaturated solution

Define loading.

1

(a)

The process of settling down of solid particles quickly by addition of alum is known as loading.

Define loading.

1

(a)

The process of settling down of solid particles quickly by addition of alum is known as loading.

How can you obtain pure water?

1

(a)

By distillation process. It is the process of simultaneous vapourisation and condensation.

What is meant by centrifugation?

1

(a)

Centrifugation is a process xof separating suspended solid particles from a liquid.