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Enhanced Senses of Animals

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Question

Find out why bridges are made.

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Solution

Bridges are made across rivers to connect the two places separated by those rivers. It makes communication and transportation much easier.

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Q. What material are the ‘strange’ huts made out of? Why does Velu find them strange?

Q. Shapes and Towers
Look for triangles in the pictures below.

• From the activity 'Changing Shapes' can you guess why triangles are used in these towers, bridges etc?
• Look around and find out more places where triangles are used.

(i) What material are the ‘strange’ huts made out of?

(ii) Why does Velu find them strange?

Q. Answer the following :

(a) Why are the connections between the resistors in a meter bridge made of thick copper strips?

(b) Why is it generally preferred to obtain the balance point in the middle of the meter bridge wire?

(c) Which material is used for the meter bridge wire and why?

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