UPSC CSE Prelims
Question 52
Consider the following activities :
- Identification of narcotics on passengers at airports or in aircraft
- Monitoring of precipitation
- Tracking the migration of animals
In how many of the above activities can the radars be used ?
View correct answer and explanation
Correct answer: B
Correct Option: B (Only two)
Explanation: Weather radar measures precipitation, while specialised radar can observe birds and other migrating animals. Detecting narcotics relies primarily on chemical screening, X-ray imaging or trained dogs.
Statement / Pair / Item-wise Analysis:
1. Incorrect/False - Routine narcotics identification does not use radar to chemically identify drugs.
2. Correct/True - Meteorological/Doppler radars detect precipitation.
3. Correct/True - Radar monitoring can track movements of migrating birds and some other animals.
Option-wise Analysis:
A. Incorrect-it counts 1, but items 2, 3 qualify, giving 2.
B. Correct-exactly 2 of the 3 listed items satisfy the condition.
C. Incorrect-it counts 3, but only 2 qualify; item(s) 1 do not.
D. Incorrect-it counts 4, but only 2 qualify; item(s) 1 do not.