Precipitation MCQ with answer and solution

Concept

Diameter of standard Symons rain gauge

Formula

NONE

Step-by-step solution

1. The Symons rain gauge is the standard non-recording type rain gauge used in India. 2. It consists of a circular collector with a funneled top to collect rainfall. 3. The standard diameter of the collecting area for a Symons rain gauge is 12.7 cm (or 5 inches). Answer: A

Explanation

The standard non-recording rain gauge used in India is the Symons rain gauge, which features a circular collector with a diameter of 12.7 cm. This standardized diameter ensures accurate and consistent measurement of rainfall volume over a defined catchment area. The collected water is then measured using a calibrated glass cylinder.

Why the other options are wrong

B) A 10 cm diameter is smaller than the standard specification for a Symons rain gauge receiver. C) A 5.08 cm diameter is incorrect as the Symons gauge uses a 12.7 cm diameter collection area. D) A 25.4 cm diameter is double the standard 12.7 cm internal diameter required for a Symons gauge.

Shortcut

Symons rain gauge collector diameter = 12.7 cm (5 inches).

Common mistake

Confusing the standard Symons rain gauge collecting diameter of 12.7 cm (5 inches) with other metric options.