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Mountain roads rarely go straight up the...

Mountain roads rarely go straight up the slope but wind upradually. Why ?

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Due to insufficient friction, the wheels of the vehicle on the road would have slipped, secondly for a large slope more power will have to be used.
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Assertion : Mountain roads rarely go straight up the slope. Reason : Slope of mountains are large therefore more chances of vehicle to slip from roads.

Why are mountain roads generally made winding upwards rather than going straight up ?

Which of the following statements is incorrect? A. a cricketer moves his hands backwards while holding a catch B. A person falling from a certain height receives more on a heap of sand injuries when he falls on a cemented floor than when he falls C. It is easier to push a lawn mower than to pull it D. Mountain roads are generally made winding upwards rather than going straight up