Question

Match the following.
$\begin{array}{cc}i)\text{horizontal}& a)\text{is the angle between line of sight and the horizontal}\\ \text{level}& \text{level when the object is above the horizontal line.}\\ ii)\text{line of sight}& b)\text{is he line running parallel to the plane on}\\ & \text{which the object is kept.}\\ iii)\text{angle of}& c)\text{is the lined rawn from the eye of the observer to the}\\ \text{elevation}& \text{point in the object viewed by the observer.}\\ iv)\text{angle of}& d)\text{is the angle between line of sight and the horizontal}\\ \text{depression}& \text{level when the object is below the horizontal line.}\end{array}$

• A. (i) - c , (ii) - a , (iii) - d, (iv) - b
• B. (i) - b , (ii) - c , (iii) - a, (iv) - d
• C. (i) - a , (ii) - b , (iii) - c, (iv) - d
• D. (i) - d , (ii) - c , (iii) - b, (iv) - a

Answer 1

The correct option is B (i) - b , (ii) - c , (iii) - a, (iv) - d

1. Horizontal level is the line running parallel to the plane on which the object is kept.
2. The line of sight is the line drawn from the eye of the observer to the point in the object viewed by the observer.
3. Angle of elevation is the angle between line of sight and the horizontal level when the object is above the horizontal line and,
4. Angle of depression is the angle between the line of sight and the horizontal level when the object is below the horizontal line.