I.Multiple Choice Questions carrying one mark each –

(1)A liquid that is immiscible and two times heavier than water is mixed in it. The two liquids

can be separated by:
(a) separating funnel	(b) evaporation
(c) filtration	(d) distillation

(2)Vinegar is a mixture of acetic acid and water, it is a:

(a)homogeneous liquid in liquid mixture

(b)homogeneous liquid gas mixture

(c)hetrogeneous liquid in liquid mixture

(d)none of these

(3)Which method of separation will be used to separate iron fillings from sand?

(a) magnetic separation	(b) sieving
(c) hand picking	(d) all of these

(4)Sarita wants to separate beads of different sizes. The easiest way to separate them would be:

(a) hand picking (b) sieving (c) magnetic separation

(d) all of these

(5)A mixture contains particles of two solids of almost the same size but different weight (solid B is light, while solid A is heavy).They can be separated by:

(a) winnowing	(b) sieving
(c) filtration	(d) handpicking

2. Match the following carrying one mark each:

	(1)	Sugar		(a) mixture
	(2)	Vinegar		(b) sieving
	(3)	Mustard seeds and suji		(c) handpicking
(4) Pebbles from rice			(d) filtration
(5) Tea leaves from tea			(e) pure substance

3.Write True (T) or False (F) carrying one mark each:

(a)Soil is a mixture.

(b)Husk from grain can be separated by sieving.

(c)Decantaion can be obtained from butter milk by centrifugation.

(d)Butter can be obtained from butter milk by centrifugation.

(e)When iron fillings and sulphur powder are mixed, a homogeneous mixture is obtained.

4.Fill in the Blanks carrying one mark each:

(a)A…………… does not have a definite melting and boiling point.

(b)Stone,wood,fruits are examples of …………………. occurring materials.

(c)…………………. Is removed from sea water,to make it fit for drinking.

(d)The process of deliberately mixing food materials with cheap , unwanted things is called

………………… .

(e)The clear liquid obtained after filtration is called ………………………. .

5.Answer in one line only carrying two marks each:

(a)Define sieving.

(b)Define winnowing.

(c)Define decantation.

(d)What is mixture?

(e)What is a pure substance?

(f)Define filtration.

(g)How can pieces of iron scrap be separated from garbage dumps?

(h)What kind of mixture can be separated by handpicking?

(i)Define sedimentation.

(j)Write three properties of mixture.

(k)How are homogeneous mixtures different from heterogeneous mixtures?

(l)Write the methods you will use to separate and mixture of iron filling, common salt and Sand.

(m)Write the methods you would use to separate:

(i) Coconut oil, water &salt

(ii) Chalk powder, marbles &water

(n)Which are the two most common filters used at homes to purify water for drinking?

(o)Meenu accidently drops tea leaves into a jar containing salt. Explain the process she should use to separate them so that both could be used.

6.Answer in two or three lines only carrying three marks each:

(a)List three properties of pure substances.

(b)Write three needs for separating of constituents of a mixture.

(c)Define loading.

(d)Explain how is salt obtained from sea water.

(e)Give two reasons why components of a mixture need to be separated.

(f)Describe a simple activity to explain the process of filtration.

(g)Explain the steps how you will separate the mixture of salt, sand and water?