The instrument used to compute the area of irregular region on a map or photograph is

Question

Question

This question was previously asked in

BPSC AE Paper 4 (General Engineering Science) 10 Nov 2022 Official Paper

Answer 1

Concept:

Planimeter:

A planimeter is a precision instrument used to measure the area of an irregularly shaped region on a map, plan, or photograph. It provides an accurate area measurement by tracing the boundary of the region in question.
The planimeter consists of a tracing arm and a measuring wheel that moves along the boundary of the area. As the tracing arm moves around the perimeter, the measuring wheel calculates the area enclosed by the traced path.

Features of a Planimeter:

Direct Area Measurement: Planimeters allow for direct measurement of the area by tracing the contour of the region. This method is straightforward and does not require complex calculations or approximations.
Versatile Application: Planimeters can be used on maps, blueprints, photographs, and any other surface where area measurement is needed. They are widely used in fields like cartography, surveying, and engineering.
Accuracy: Planimeters provide high accuracy for area measurements, making them suitable for professional use in surveying and engineering tasks where precise area computations are critical.

Additional Information

Rotameter: A rotameter is a device used to measure the flow rate of liquids and gases, not for area measurement.
Tachometer: A tachometer measures the rotational speed of an object, typically in revolutions per minute (RPM), and is not used for area calculation.
Odometer: An odometer measures the distance traveled by a vehicle, not the area of a region on a map or photograph.