Air is all around us but does not hinder us from seeing each other. Class 6

Air is all around us but does not hinder us from seeing each other. Class 6

Question 1.

Air is all around us but does not hinder us from seeing each other. Whereas, if a wooden door comes in between, we cannot see each other. It is because air is ____ and the wooden door is ______. Choose the most appropriate option :

(i) transparent, opaque

(ii) translucent, transparent

(iii) opaque, translucent

(iv) transparent, translucent

Answer:

(i) transparent, opaque

Question 2.

Imagine you have two mysterious materials, X and Y. When you try to press material X, it feels rigid and does not change its shape easily. On the other hand, material Y easily changes its shape when you press it. Now, when you mix both materials in water, only material X dissolves completely, while material Y remains unchanged. What can materials X and Y be? Can you identify whether material X is hard or soft? What about material Y? Justify your answer. Class 6

Answer:

Material X can be sugar (soluble in water) and Y can be cotton (insoluble in water).

X is hard. Y is soft.

A substance which feels rigid and does not change its shape is called hard. Sugar is a hard substance and is also soluble in water. Whereas, materials which can easily change shape on pressing are soft in nature. Cotton is soft and is also insoluble in water.