Which of the following is a meteorological instrument consisting of a funnel-shaped collector attached to a measuring tube used to measure rainfall per unit area at a given time?

Standard Rain Gauge

The correct answer is option 3. Standard Rain Gauge.

A standard rain gauge is a meteorological instrument designed to measure the amount of precipitation, typically rainfall, that occurs over a specific area during a certain period. It consists of a funnel-shaped collector attached to a measuring tube. When rain falls into the funnel, it is directed into the measuring tube, where the depth of the collected water is measured.

The measuring tube usually has markings in millimeters or inches, allowing meteorologists to accurately determine the amount of rainfall that has occurred. This information is important for weather forecasting, hydrological studies, agriculture, and various other applications.

Standard rain gauges are widely used across the world due to their simplicity, reliability, and ease of use. They provide valuable data for understanding precipitation patterns and climate trends in different regions.