Question

The instrument used for measuring the area on a contour map is called:

• A. Areameter
• B. Clinometer
• C. Planimeter
• D. Graphometer

Hint:

Common surveying instruments: \[ \begin{aligned} \text{Planimeter} &\rightarrow \text{Area measurement} \text{Clinometer} &\rightarrow \text{Slope measurement} \text{Graphometer} &\rightarrow \text{Horizontal angle measurement} \end{aligned} \]

Answer 1

The Correct Option is C

Concept: A planimeter is a surveying instrument used to determine the area of irregular figures drawn on maps, plans, and contour maps.

Step 1: Recall the functions of the instruments.
• Planimeter $\rightarrow$ Measures area.
• Clinometer $\rightarrow$ Measures slope or vertical angle.
• Graphometer $\rightarrow$ Measures horizontal angles.
• Areameter is not the standard surveying instrument used for contour maps.

Step 2: Identify the correct instrument. Hence, \[ \boxed{\text{Planimeter is used to measure areas on maps}.} \] Therefore, the correct option is \[ \boxed{(C)\;\text{Planimeter}.} \]