Consider the following activities: 1. Identification of narcotics on passengers at airports or in aircraft 2. Monitoring of precipitation 3. Tracking the migration of animals In how many of the above activities can the radars be used?

Answer: B. Radars can be used in two of the three listed activities. (1) Identification of narcotics at airports: NO, radar is not used for narcotics detection. This is done via X-ray scanners, sniffer dogs, ion-mobility spectrometers and trace chemical detection — none of which are radar. (2) Monitoring precipitation: YES. Weather radar (Doppler radar) is the standard technology for monitoring rain, snow and storms. India has a national network of Doppler weather radars (DWRs) operated by IMD. (3) Tracking the migration of animals: YES. Radar ornithology and entomology are well-established. Specialised radars track bird and bat migration; aeroecology radars detect insect swarms. Both NEXRAD-class weather radars and specialised tracking radars are used. Two out of three uses are valid radar applications. Source: IMD Doppler radar network / aeroecology radar studies.