Correct option is C
The correct answer is: (c), A-III, B-IV, C-I, D-II
The Campbell-Stokes recorder is used to measure the duration of sunshine or sunlight hours. It consists of a glass sphere that focuses sunlight onto a paper card, which burns or scorches when exposed to direct sunlight. The length of the burn mark indicates the duration of sunshine.
A barometer is an instrument used to measure atmospheric pressure. It typically consists of a sealed tube filled with mercury or another liquid, with one end immersed in a reservoir of the same liquid. Changes in atmospheric pressure cause the liquid level in the tube to rise or fall, which is then measured to determine the atmospheric pressure.
A hygrograph is used to measure relative humidity, which is the amount of moisture present in the air relative to the maximum amount of moisture the air can hold at a given temperature. A hygrograph typically consists of a hair or synthetic fiber that expands or contracts based on changes in humidity, which is then recorded on a chart or graph.
A pan evaporimeter is a device used to measure the rate of evaporation of water from an open pan or container placed outdoors. The rate of evaporation is influenced by factors such as temperature, humidity, wind speed, and solar radiation. By measuring the decrease in water level over time, the rate of evaporation can be calculated.