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NCERT Exemplar · Class 6 · Science

Chapter 4: Sorting Materials and Groups

Practice each question, then open the answer or worked solution.

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Long Answer Questions

4 questions
Q22Written answer

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. 

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Worked solution

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.


Q23Written answer

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

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Worked solution

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


Q24Written answer

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

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Ans: 

Opaque

Translucent

Transparent

Opaque refers to a material that prevents an object from being seen at all. E.g. - wood, marble.

Translucent is a material that allows an object to be viewed but not clearly. E.g. Butter paper, frosted glass. 

Transparent is a substance that allows an object to be seen plainly through it. E.g. Clear water, glass.


Q25Written answer

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. 

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Worked solution

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.


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