NCERT Exemplar for Class 6 Science Solutions Chapter 4 Sorting Materials and Groups

Multiple Choice Questions

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 

Ans: The correct answer is option b) Soft drink. 

Soft drinks are composed of water, carbon dioxide and acid due to which the iron nail is corroded and appears dull. 

2. Pick one material from the following which is completely soluble in water. 

(a) Chalk powder 

(b) Tea leaves 

(c) Glucose 

(d) Saw dust 

Ans: The correct answer is option c) Glucose. 

Among the given options, only glucose is highly soluble in water. 

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) 

Ans: The correct answer is option c) (i) and (iv). 

The objects through which we can see at the other side are known as transparent objects. Transparent objects include magnifying glasses and glass tumblers.

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) 

Ans: The correct answer is option c) (i) and (iii). 

Mirror and magnet are opaque. Mirror is the glass painted on one side. And the magnet is made up of iron metal. 

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 

Ans: The correct answer is option c) Muslin cloth. 

The objects through which we cannot see clearly are known as translucent. Muslin cloth is a translucent object. Aluminium foils and mirrors are opaque. Glass tumbler is transparent.

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 

Ans: The correct answer is option b) feather, plastic ball. 

The lighter material floats in water whereas the heavier material sinks in water. 

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 

Ans: The correct answer is option d) Steel and plastic. Steel is easily moulded. It can be changed into any shape to get sharp points and plastic is used to seal the edges. 

8. Which of the following materials is not lustrous? 

(a) Gold 

(b) Silver 

(c) Wood 

(d) Diamond 

Ans: The correct answer is option c) Wood. 

Wood is an organic opaque structure and is not lustrous. 

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. 

Ans: The correct answer is option c) Materials are grouped for fun. 

Materials are not grouped for fun. They are grouped to study their properties and according to their uses in a systematic manner. 

10. Find the odd one out from the following 

(a) Tawa 

(b) Spade 

(c) Pressure cooker 

(d) Eraser 

Ans: The correct answer is option d) Eraser.

Eraser is made up of an elastic material rubber whereas tawa, spade and pressure cooker are made up of steel metal. 

11. Which type of the following materials is used for making the front glass (wind screen) of a car? 

(a) Transparent 

(b) Translucent 

(c) Opaque 

(d) All the above 

Ans: The correct answer is option a) Transparent. 

The windscreen of an automobile is made of transparent glass so that everything can be seen clearly.

Very Short Answer Questions

12. It 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? 

Ans:  Her dull silver spoon reacted with gases like hydrogen sulphide and lost its shine in moist air. Whereas gold does not react with the gases present in the atmosphere as it is a noble metal.

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? 

Ans: Because honey and water are very soluble in each other, Raveena will receive the product in the form of a solution.

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

Ans: Yes, her brother will be able to locate Shikha because she is hiding behind a glass door that is transparent in nature. 

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?

Ans: At first the cotton ball will float in water because it is light weighted. But then it will slowly absorb water and become heavier, eventually will sink. 

Short Answer Questions

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

Ans: Eraser, rubber band, cooked rice, fresh chapati and leaf are soft materials because they can be easily compressed and scratched easily. 

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. 

Ans: (a) Soluble pairs: 

(i) Glucose – water 

(ii) Mustard oil – groundnut oil 

(iii) Honey – water 

(b) Insoluble pairs:

(i) Rice flour – water 

(ii) Turmeric – water

(iii) Mustard oil – water

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.

Ans:

19 . Arrange the jumbled words to arrive at the appropriate names of materials and also write two uses of each. 

(a) milaunuim 

Ans: Aluminium 

Uses: It is used in aeroplane equipment and as foils. 

(b) tcaslpi 

Ans: Plastic 

Uses: Many objects are made, like bucket, lunch box, and pencil box. 

(c) serene 

Ans: Kerosene 

Uses: It's used as a solvent and a fire starter.

(d) gavnier 

Ans: Vinegar 

Uses: Food ingredients, preservatives.

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

Ans: The correct match is-

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

Ans: Five objects in the puzzle that are opaque and would sink in water are: 

i. Coin 

ii. Pen 

iii. Stone 

iv. Eraser 

v. Coal 

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. 

Ans: Properties of given materials are- 

i. Chalk- is non-lustrous, rough, and hard. 

ii. Candle- is non-lustrous, smooth, and hard. 

iii. Wood- is non-lustrous, rough, and hard. 

iv. Aluminum- is lustrous, smooth, and hard. 

v. Iron nail- is non-lustrous, smooth, and hard. 

vi. Cotton- is non-lustrous, smooth, and soft.

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

Ans: For respiration and photosynthesis, aquatic animals and plants rely on oxygen dissolved in water.

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

Ans: 

25. Sugar, salt, mustard oil, sand, sawdust, honey, chalk powder, petals of 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. 

Ans: Soluble and insoluble substances in water-

Salt, sugar, honey glucose, copper sulphate crystals are all soluble in water. 

Mustard oil, sawdust, sand, wheat flour, petals of a flower, chalk powder and soil are all insoluble in water.

NCERT Exemplar for Class 6 Science

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