The limiting gredient of ordinary vehicle is . . . . . . . . from the horizontal.

Solution(By Examveda Team)

The limiting gradient of an ordinary vehicle is the steepest slope that it can climb without losing traction and slipping. The steepest slope that an ordinary vehicle can climb varies depending on several factors such as the weight, power, and tire type of the vehicle. However, as a general rule, the limiting gradient for an ordinary vehicle is approximately 1 in 6, which is option A in the given options.

This means that for every 6 units of horizontal distance traveled, the vehicle can climb 1 unit of vertical distance without losing traction and slipping. It is important to note that the actual limiting gradient for a specific vehicle may vary depending on the specific conditions such as the type of surface, weather, and load of the vehicle. Therefore, it is essential to assess the specific conditions and consult the vehicle's manual to determine its actual limiting gradient.