The instrument that measures the wind speed is called an ……………………………..
1) Thermometer
2) Anemometer
3) Seismograph
4) Ammeter

Hint: In early days we all have seen a device near the airport or at home which is long standing on the ground and has four sides with metal spheres attach on each side, it rotates when there is high wind and makes a “click” sound while rotating.

Complete answer:
Thermometer: The name of “Thermometer” is self-explanatory, here thermo means thermal that means it has to do something with temperature and meter is a measurement unit of length. So, in other words “Thermometer” means ‘that which measures the temperature’. Therefore, the thermometer does not measure wind speed and is not the correct option.
Seismograph: Seismograph is a device that measures the disturbances in the earth’s seismic plates in other words it measures earthquakes. The word “Seism” means that it has something to do with seismic plates and “graph” means that it measures or notes the readings of the seismic disturbances. Therefore, the seismograph does not measure wind speed and is not the correct option.
Ammeter: The word “Ammeter” is self-explanatory as “Am” means Ampere which is the unit of current, this word “Am” gives us the clue that it has something to do with current and the word “meter” which is the measuring unit of length suggests that something is being measured. Thus “ammeter” means that device which measures current and is therefore not the correct option.
Anemometer: It is a device which is meteorological in nature. It was developed by the scientist Leon Battista Alberti in the year 1450. It is used to measure the wind speed and pressure. This device was developed so that meteorologists can study the patterns of the weather, nowadays it is used at airports to measure the wind speed and pressure.

Therefore, Anemometer is the correct option.

Therefore, Option “2” is correct. The instrument that measures the wind speed is called an Anemometer.

Note: Here, we need to explain each option separately and provide a justified answer as to why the particular option is not correct. Also, provide the utility of each option given in the question along with suitable examples.