Sort the given objects as rough or smooth. Wet soap Coir Feather Stone Glass ball Paperboard Sand paper Plastic spoon

Sort the given objects as rough or smooth.

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Chapter 2: Matter and Materials - Try to Answer [Page 97]

Chapter 2 Matter and Materials
Try to Answer | Q 4 | Page 97

Long Answer Type Question:

‘Grouping of objects helps the shopkeeper.’ Justify the statement.

Write whether the given materials are hard or soft.

Wood	Eraser	Cotton
______	______	______

Sand paper is a good example for smooth materials.

When can you say a material is waterproof material?

Name five objects which can be made from wood.

Choose the odd one:

Name some examples for shiny materials?

Match the substances in Column A with their applications given in Column B.

Column A (Substance)	Column B (Application)
(a) oxygen	(i) for making crackers
(b) copper	(ii) for disinfecting water
(c) sulphur	(iii) all living beings inhale during breathing
(d) iron	(iv) for making electric wires
(e) chlorine	(v) for making rails

Which of the following statements is not true?

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