Correct Answer : All of the above
Explanation : * A level line lies in level surface* A horizontal line is tangential to the level surface* A level surface is perpendicular at all points to the direction of gravity* A horizontal surface is normal to the direction of gravity at only one point
Correct Answer : Option (B) : 206.75 m
Correct Answer : Option (B) : north-west quadrant
Correct Answer : Option (C) : Both (A) and (B)