Question

4. Name two materials which are smooth to touch.
5. Define opaque objects.
6. Name two substances which are not soluble in
water.
7. Name any one material which is smooth but
hard.​

Answer 1

Answer:

4.silk

5. the object which doesn't allow light to pass through it it is known as Opaque object

6. oil,wood

7.diamond

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Answer 2

Answer:

4. Plastic sheet and mirror.

5. An opaque object is neither transparent nor translucent.

6. Sand and flour.

7. Diamond.