Chapter4: Sorting Materials into Groups

I. Multiple Choice Questions carrying one mark each:

(1) Tick the material which is man ‐made:

(a) fruits	(b) cereals
(c) glass	(d) wood
(2) Tick the material which is hard:
(a) cotton	(b) sponge
(c) metal	(d) all of these
(3) An example of soluble substance is:
(a) sand	(b) wax
(c) chalk	(d) salt

(4) A gas that comes out when you open an aerated drink bottle is:

(a) carbon dioxide (b) oxygen	(c) nitrogen	(d) hydrogen
(5) An example of a conductor is:
(a) paper	(b) wood
(c) metal	(d) rubber

2. Match the following carrying one mark each:

	(1) Combustible liquid		(a) LPG
	(2) Combustible gas		(b) camphor
(3)		Combustible solid	(c) chloroform
(4)		A volatile substance	(d) glass
(5) A brittle substance			(e) ghee

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

(a)Carbon is a malleable substance.

(b)All solids are good conductors of heat.

(c)Liquids and gases are poor conductors of heat.

(d)Early man covered his body with leaves and skin of animals.

4.Fill in the Blanks carrying one mark each:

(a)…………… helps to understand similarities and dissimilarities between objects.

(b)…………… is used to protect woollen clothes from insects and has a characteristic odour.

(c)Metals have a shiny appearance, we can say that they have a ……………………… look.

(d)………………. Is miscible in water while cooking oil is ……………………….. .

(e)We can see through air, it is ………………….

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

(a)Define malleability.

(b)Define classification.

(c)Define ductility.

(d)What is a brittleness?

(e)What is a translucent object?

(f)Define conductivity.

(h)What is a soluble substance?

(i)What is magnetic substance?

(j)How are transparent objects different from opaque objects?

(k)Which of the following is not soluble in water?

(i)Chalk (ii) common salt (iii) Sugar (iv) Milk (v) Ink.

(l)Give two examples of objects which are made of more than one material.

(m)Which of the following materials is not suitable for making a bucket:

(i) Plastic

(ii) Steel

(iii) Paper

(iv) copper

(n)Name two gases, two solids and two liquids which are soluble in water.

(o)What are translucent objects? Give examples.

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

(a)Why do metal objects lose their luster after a while?

(b)Why is glass called a brittle substance?

(c)Distinguish between miscible and immiscible liquids.

(c)Write three advantages of grouping in classifying materials?

(f)Classify the following in different ways:

(i) Your clothes

(ii) Names in a phone book

(iii) Utensils in your kitchen.

(g)Give two examples to explain the same things can be made from different materials.

(h)Write seven ways in which materials can be grouped or classified.

(i)Give one similarity between wood and oxygen.

(j)Why does wax float on water while sand settles down?