Question

Rainfall is measured by a precise instrument called as ___________.
A. Rain meter
B. Rain gauge
C. Rain tube
D. None of these

Answer 1

Hint:Rainfall is the amount of condensed water vapour falling as rain in the form of water droplets in a given area at a given time. Rain is a major factor that maintains the water cycle and is responsible for depositing most of the freshwater on the earth and sustenance of ground water tables.

Complete answer:
Rain is usually measured in units of depth per unit time. The value is measured in millimetres per hour. The instrument used to measure the amount of rainfall is called a rain gauge. It is scientifically also known as udometer and pluviometer. It is a weather tool and used by meteorologists to calculate the amount of precipitation in a given amount of time per unit area.Rain gauge was first invented in 1441 in Korea thereafter, Christopher Wren in the year 1662 in Britain invented the first tipping bucket rain gauge.

Hence, the correct answer is option (B).

Note:There are many types of rain gauges available now. Some of which include the optical rain gauge, tipping bucket style rain gauge, weight based rain gauges, acoustic rain gauges, and the graduated cylinder rain gauge. Tipping water rain gauge is a common device that contains a container in which the rain water gets collected during a rainfall. When filled to a certain level the container or bucket tips and drains in a graduated glass cylinder. Then the height of rainwater accumulated in the container per given time is measured which is 1 mm of measured rainfall considered equivalent to 1 Litre of precipitated rain water volume per metre squared.