Which of the following vehicles are more streamlined to reduce friction?

1, 2, 3 and 4

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2, 3 and 4 only

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1, 2 and 3 only

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1, 3 and 4 only

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Solution

The correct option is D 1, 3 and 4 only
Aircrafts, rockets, and bullet trains are required to travel at very high speeds. Hence, they experience enormous friction from the air. To reduce this, they are streamlined. Lorries travel at much slower speeds and so they don't need more streamlining.

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