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?

1. Only one
2. Only two
3. All three
4. None

Explanation

Activity 1 is incorrect

• Radars are not used for identifying narcotics. This is usually done through the use of other scanning technologies.

Activity 2 is correct

• Radars can detect rain, snow, sleet, and other types of precipitation.

Activity 3 is correct

• Radars can track the movement of birds, bats, and even insects over long distances.

Answer: (b) Only two: Difficulty Level: Easy