Sorting Materials into Groups Exercise Questions, CH 4, CLASS 6

 Exercise Questions

1. Name five objects which can be made from wood.

Solution:

a) Table

b) Chair

c) Doors

d) Desk

e) Box

2. Select those objects from the following which shine: Glass bowl, plastic toy, steel spoon, cotton shirt

Solution:

Glass bowl and  steel spoon are the objects which shine

3. Match the objects given below with the materials from which they could be made. Remember, an object could be made from more than one material and a given material could be used for making many objects.

Objects	Material
Book	Glass
Tumbler	wood
Chair	Paper
Toy	Leather
Shoes	Plastics

Solution:

Objects	Material
Book	Paper, Wood
Tumbler	Glass, wood, plastic
Chair	wood, plastic
Toy	Glass, Wood, Paper, Plastics, Leather
Shoes	Leather, Plastic

4. State whether the statements given below are True or False.

(i) Stone is transparent, while glass is opaque.

(ii) A notebook has lustre while eraser does not.

(iii) Chalk dissolves in water.

(iv) A piece of wood floats on water.

(v) Sugar does not dissolve in water.

(vi) Oil mixes with water.

(vii) Sand settles down in water.

(viii) Vinegar dissolves in water.

Solution:

i) False

ii)False

iii) False

iv) True

v) False

vi) False

vii) True

viii) True

5. Given below are the names of some objects and materials:

Water, basket ball, orange, sugar, globe, apple and earthen pitcher. Group them as:

(a) Round shaped and other shapes (b) Eatables and non eatables

Solution:

(a) Round shaped – Basketball, Orange, Globe, Apple, Earthen pitcher

Other shapes – Water, Sugar

(b) Eatables – Water, Orange, Sugar, Apple

Non eatables – Basketball, Globe, Earthen pitcher

6. List all items known to you that float on water. Check and see if they will float on an oil or kerosene.

Solution:

Few items that float on water are as follows:

1. Sponge’s piece
2. Plastic bottle
3. Paper’s piece
4. Thermocol’s piece
5. Wood
6. Plastic ball
7. Cork

However, these items will  not float on an oil or kerosene

7. Find the odd one out from the following:

a) Chair, Bed, Table, Baby, Cupboard

b) Rose, Jasmine, Boat, Marigold, Lotus

c) Aluminum, Iron, Copper, Silver, Sand

d) Sugar, Salt, Sand, Copper sulphate

Solution:

a) Baby – others are made up of wood

b) Boat – others are flowers

c) Sand – others are metals

d) Sand – others are soluble in water

WORKSHEET 1 (Sorting Materials and Groups, CHAPTER 4, CLASS 6)

 1. An iron nail is kept in each of the following liquids. In which case would it lose its shine and appear dull?

(a) Mustard oil
(b) Soft drink
(c) Coconut oil
(d) Kerosene

2. Pick one material from the following which is completely soluble in water.
(a) Chalk powder
(b) Tea leaves
(c) Glucose
(d) Sawdust

3. You are provided with the following materials
(i) magnifying glass
(ii) mirror
(iii) stainless steel plate
(iv) glass tumbler.
Which of the above materials will you identify as transparent?
(a) (i) and (ii)
(b) (i) and (iii)
(c) (i) and (iv)
(d) (iii) and (iv)

4. Boojho found a bag containing the following materials.
(i) Mirror
(ii) Paper stained with oil
(iii) Magnet
(iv) Glass spectacles
Help Boojho in finding out the material(s) which is/are opaque.

(a) (i) only

(b) (iv) only

(c) (i) and (iii)

(d) (ii) and (iv)

5. While doing an activity in class, the teacher asked Paheli to handover a translucent material. Which among the following materials will Paheli pick and give her teacher?

(a) Glass tumbler

(b) Mirror

(c) Muslin cloth

(d) Aluminium foil

6. Which pair of substances among the following would float in a tumbler half-filled with water?
(a) Cotton thread, thermocol
(b) Feather, plastic ball
(c) Pin, oil drops
(d) Rubber band, coin

7. Which among the following are commonly used for making a safety pin?
(a) Wood and glass
(b) Plastic and glass
(c) Leather and plastic
(d) Steel and plastic

8. Which of the following materials is not lustrous?

(a) Gold

(b) Silver

(c) Wood

(d) Diamond

9. Which of the following statements is not true?
(a) Materials are grouped for convenience.
(b) Materials are grouped to study their properties.
(c) Materials are grouped for fun.
(d) Materials are grouped according to their uses.

10. Find the odd one out from the following.
(a) Tawa
(b) Spade
(c) Pressure cooker
(d) Eraser

11. Which type of the following materials is used for making the front glass (windscreen) of a car?
(a) Transparent
(b) Translucent
(c) Opaque
(d) All the above

Very Short Answer Questions:

12. lt was Paheli’s birthday. Her grandmother gave her two gifts made of metals, one old dull silver spoon and a pair of lustrous gold earrings. She was surprised to see the difference in the appearance of the two metals. Can you explain the reason for this difference?

13. Mixtures of red chilli powder in water, butter in water, petrol in water, and honey in water were given to Radha, Sudha, Sofia and Raveena, respectively. Whose mixture is in solution form?

14. On a bright sunny day, Shikha was playing hide and seek with her brother. She hid herself behind a glass door. Do you think her brother will be able to locate her? If yes, why? If no, why not?

15. Take a small cotton ball and place it in a tumbler/ bowl filled with water. Observe it for at least 10 minutes. Will it float or sink in water and why?

16. Which among the following materials would you identify as soft materials and why? Ice, rubber band, leaf, eraser, pencil, pearl, a piece of a wooden board, cooked rice, pulses and fresh chapati.

17. You are provided with the following materials – turmeric, honey, mustard oil, water, glucose, rice flour, groundnut oil.
Make any three pairs of substances where one substance is soluble in the other and any three pairs of substances where one substance remains insoluble in the other substances.

18. During summer holidays, a group of children collected a lump of salt, green grass, broken glass piece, a small thermocol box, pen, iron nail, glass marbles, hair, naphthalene ball, a piece of sugar candy (mishri) and tried to group them on the basis of properties given in table 4.1 below. Help them in filling the table.

Name of the material	Appearance (Hard/Soft)	Transparency (Transparent/Translucent/Opaque)	Floats/Sinks in water	Soluble/Insoluble in water

19. Arrange the jumbled words to arrive at the appropriate names of materials and also write two uses of each.
(a) milaunuim
(b) tcaslpi
(c) soekrnee
(d) gavnier

20. Match the objects given in column I with the materials given in column II.

Column I	Column II
(a) Surgical instruments	(i) Plastic
(b) Newspaper	(ii) Animal product
(c) Electrical switches	(iii) Steel
(d) Wool	(iv) Plant product

21. Pick five objects from the word box given as Fig. 4.1 which are opaque and would sink in water.

O	S	T	P	L	E
A	T	L	E	E	R
C	O	I	N	A	A
O	N	K	C	F	S
A	E	E	I	W	E
L	L	Y	L	R	R

Long Answer Questions:

22. Chalk, iron nail, wood, aluminium, candle, cotton usually look different from each other. Give some properties by which we can prove that these materials are different.

23. Why do you think oxygen dissolved in water is important for the survival of aquatic animals and plants?

24. Differentiate among opaque, translucent and transparent materials, giving one example of each.

25. Sugar, salt, mustard oil, sand, sawdust, honey, chalk powder, petals of a flower, soil, copper sulphate crystals, glucose, wheat flour are some substances given to Paheli. She wants to know whether these substances are soluble in water or not. Help her in identifying soluble and insoluble substances in water.
Solution:

Soluble in water:

Sugar

Salt

Honey

Copper sulphate crystals

Glucose

Insoluble in water:

Mustard oil

Sand

Sawdust

Chalk powder

Petals of flower

Soil

Wheat flour

SOLUTIONS OF WORKSHEET 1 (Sorting Materials and Groups, CHAPTER 4, CLASS 6)

 1. Solution:

(b): Soft drink

Soft drinks contain water, carbon dioxide and acid due to which iron nail is corroded and appears dull.

2. Solution:

(c): Glucose

Glucose is one substance which is completely soluble in water.

3. Solution:

(c): Magnifying glass and glass tumbler

Magnifying glass and glass tumbler are transparent materials.

4. Solution:

Solution:

(c): Mirror and Magnet

A mirror is opaque since it is painted on one side.

Magnet is opaque since it is made up of iron metal.

5. (c): Muslin cloth

Muslin cloth is translucent since we can see through it but not clearly.

Glass tumbler is transparent.

Mirror and aluminum foil are opaque.

6. (b): Feather, plastic ball

Feather and plastic ball will float on water since they are lighter than water.

7. (d): Steel and plastic

Steel can be moulded to get sharp points and plastic is used to seal the edges. Hence steel and plastic are used for making safety pins.

8. Solution:

(c): Wood

Wood is not lustrous since it is not a crystalline substance.

9. Solution:

(c): Materials are grouped for fun.

Materials are usually grouped to study their properties and according to their uses in systematic manner. Hence materials are not grouped for fun.

10. Solution:

(d): Eraser

Eraser is made up of rubber while tawa, pressure cooker and spade are made up of metal.

11. Solution:

(a): Transparent

Transparent glass is used for making the front glass of a car so that everything can be seen clearly.

12. Solution:

Paheli could see the difference in the appearance of two metals since silver reacts with some gases like hydrogen sulphide and loses its shine in moist air. Gold is a noble metal which does not react with the gases present in the atmosphere.

13. Solution:

Raveena will get the mixture in solution form. Since honey and water are soluble with each other hence a solution will be formed when honey is mixed with water.

14. Solution:

Yes, Shikha’s brother could locate her since the glass door which she hid is transparent in nature.

15. Solution:

Initially, the cotton ball floats on water since it is lighter. Slowly it absorbs water and becomes heavy and later sinks in water.

16. Solution:

Leaf, rubber band, cooked rice, eraser and fresh chapati are soft materials because they can be scratched or compressed easily.

17. Solution:

Soluble pairs

(i) Honey – water

(ii) Mustard oil – groundnut oil

(iii) Glucose – water

Insoluble pairs

(i) Mustard oil – water

(ii) Turmeric – water

(iii) Rice flour – water

18. Solution:

Name of the material	Appearance (Hard/Soft)	Transparency (Transparent/Translucent/Opaque)	Floats/Sinks in water	Soluble/Insoluble in water
Lump of salt	Hard	Opaque	Sinks	Soluble
Green grass	Soft	Opaque	Floats	Insoluble
Broken glass piece	Hard	Transparent	Sinks	Insoluble
Thermocol box	Soft	Opaque	Floats	Insoluble
Pen	Hard	Opaque	Floats	Insoluble
Iron nail	Hard	Opaque	Sinks	Insoluble
Glass marbles	Hard	Transparent	Sinks	Insoluble
Hair	Hard	Opaque	Floats	Insoluble
Naphthalene ball	Hard	Opaque	Floats	Insoluble
A piece of sugar candy	Hard	Opaque	Sinks	Soluble

19. Solution:

The arranged word are:

(a) Aluminium – It can be used to wrap food in the foil, in making aircraft, etc.

(b) Plastic – It can be used as buckets/pencil box, etc.

(c) Kerosene – It can be used as fuel, solvent, etc.

(d) Vinegar – It can be used as a preservative, food ingredients, etc.

20. Solution:

The correct match is:

Column I	Column II
(a) Surgical instruments	(iii) Steel
(b) Newspaper	(iv) Plant product
(c) Electrical switches	(i) Plastic
(d) Wool	(ii) Animal product

21. Solution:

Objects that are opaque and would sink in water are:

(i) Coin

(ii) Stone

(iii) Key

(iv) Pencil

(v) Eraser

22. Solution:

Few properties by which we can prove that these materials are different:

Chalk – Hard, rough, non-lustrous

Iron nail – Hard, smooth, lustrous

Wood – Hard, rough, non-lustrous

Aluminium – Hard, smooth, lustrous

Candle – Hard, smooth, non-lustrous

Cotton – Soft, smooth, non-lustrous

23. Solution:

Aquatic animals and plants use oxygen which is dissolved in water for breathing and photosynthesis.

24. Solution:

Those substances through which objects cannot be seen are termed as opaque substances. Example: wood, stone.

Those substances through which objects can be seen but not clearly are termed as translucent substances. Example: frosted glass, oiled paper.

Those substances through which objects can be seen clearly are termed as transparent substances. Example: crystal clear water, glass.

25. Solution:

Soluble in water:

Sugar

Salt

Honey

Copper sulphate crystals

Glucose

Insoluble in water:

Mustard oil

Sand

Sawdust

Chalk powder

Petals of flower

Soil

Wheat flour

WORKSHEET 1 (MATERIALS: METALS AND NON METALS, CLASS 8, CH 4)

1. Which of the following is not a metal?

(a) Copper

(b) Sulphur

(c) Aluminium

(d) Iron

2. The substance that will be flattened on beating with a hammer is

(a) Crystal of iodine

(b) Lump of sulphur

(c) Piece of coal

(d) Zinc granule

3. Boojho has learnt that non-metals on beating with a hammer are generally broken into pieces. Which of the following is a nonmetal?

(a) Iron nail

(b) Aluminium wire

(c) Copperplate

(d) Piece of coal

4. Materials which can be drawn into wires are called ductile. Which of the following is not a ductile material?

(a) Silver

(b) Copper

(c) Sulphur

(d) Aluminium

5. Metals are generally hard. Which of the following metals is an exception and can be cut with a knife?

(a) Iron

(b) Sodium

(c) Gold

(d) Magnesium

.

6. Metals are generally solid. Which of the following metals is in the liquid state at room temperature?

(a) Mercury

(b) Silver

(c) Aluminium

(d) Sodium

7. Metals generally react with dilute acids to produce hydrogen gas. Which one of the following metals does not react with dilute hydrochloric acid?

(a) Magnesium

(b) Aluminium

(c) Iron

(d) Copper

8. Which of the following reacts with cold water vigorously?

(a) Carbon

(b) Sodium

(c) Magnesium

(d) Sulphur

9. The metal which produces hydrogen gas on reaction with dilute hydrochloric acid as well as sodium hydroxide solution is

(a) Copper

(b) Iron

(c) Aluminium

(d) Sodium

10. Which of the following non-metals reacts and catches fire on exposure to air?

(a) Phosphorus

(b) Nitrogen

(c) Sulphur

(d) Hydrogen

11. Generally, metallic oxides are basic and non-metallic oxides are acidic in nature. The solution of which of the following oxides in water will change the colour of blue litmus to red?

(a) Sulphur dioxide

(b) Magnesium oxide

(c) Iron oxide

(d) Copper oxide

12. Which of the following property is not responsible for copper to be used as electrical conduction wires?

(a) Ductility

(b)Colour

(c) Good conductor of electricity

(d) It is solid

Very Short Answer Questions

13. Name two soft metals which can be cut with a knife.

14. Which non-metal is essential for our life and all living beings inhale it during breathing?

15. Name two major non-metals which are present in fertilisers and enhance the growth of plants.

16. Which non-metal is used to disinfect water?

17. A purple coloured non-metal form a brown solution in alcohol which is applied on wounds as an antiseptic. Name the nonmetal.

18. Zinc sulphate forms a colourless solution in water. Will you observe any colour on adding copper turning in it?

19. Why are bells made of metals?

20. Which liquid metal is used for making thermometers?

21. Which of the following metals can displace the other two metals from their salt solutions?

Short Answer Questions

22. Paheli bought a statue made of copper. To her surprise, it acquired a dull green coating after a couple of months. Explain the reason.

23. In Fig 4.1 you find that the bulb glows when an iron nail is placed between two ends of the wire. Complete the following sentences on the bases of this fact.

(a) __________ is a metal.

(b) Metals are good __________ of electricity.

24. If in Fig. 4.1 iron nail is replaced by a wooden stick, will the bulb glow or not? Justify your answer

25. Paheli prepared a blue coloured solution of copper sulphate in beaker A and placed an iron nail in it. Boojho prepared a yellowish-green solution of ferrous sulphate in beaker B and placed a copper wire in it. What changes will they observe in the two beakers after an hour?