Which of the following have highly streamlined structures?

Aeroplanes

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Submarines

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Bullock carts

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Bullet trains

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Solution

The correct option is D Bullet trains
Aeroplanes, submarines, racing cars, bullet trains etc. are designed to have a streamlined structure. This is done so that they experience minimum drag from the fluid through which they are travelling. Drag force depends on speed of the body relative to the surrounding fluid. More the speed, more will be the drag. As bullock carts travel at a much slower speed, they don't experience much air drag.

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