43. An exceptional grade may be provided upto 1 in 12 along hill roads, if the length does not exceed

44. On the recommendations of Indian Road Congress, the ruling gradient in plains, is

45. The steepest gradient permitted on roads which, in ordinary conditions, does not exceed, is known

48. If A is the projected area of a vehicle in square metres,V is speed of the vehicles in kilometres per hour and C is a constant, then the wind resistance R to the moving vehicles, is given by

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