Correct option is A
Clinometer:- It is an instrument for measuring
angles of slope, elevation or depression of an object with respect to the ground.
• While the spirit level is restricted to relatively small angles, clinometers can be used for much larger
angles.
• Clinometers are used to determine the straightness and flatness of surfaces.
Tellurometer:- It is an EDM that uses high-frequency radio waves (microwaves) for measuring distance. Pantagraph:- It is used for enlarging, reducing, or reproducing the plans. Its working is based on the principle of similar triangles.
Planimeter:- It is used for measurement of the area of cross-sections for the highways and railways, and for checking computed areas in property surveys and property divisions.
•The area determined with a planimeter is more accurate when the area is larger and particularly when the plotting scale is large.
