Which of the following are examples of using streamlined shapes to reduce friction?

1, 2 and 3 only

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1, 3 and 4 only

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2, 3 and 4 only

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1, 2, 3 and 4

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Solution

The correct option is B 1, 3 and 4 only
Aircrafts, rockets and bullet trains travel at very high speeds. As a result of this, they experience enormous drag force. To reduce this, they are streamlined. Lorries travel at much slower speed and hence streamlining is not that important.

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