Question

Why might radars not be used a decade from now?

• A. Stealth technology will advance so much that it is pointless to use radar to detect aircraft.
• B. UAVs can remain over hostile territory without any danger of being detected.
• C. Computers on board may enable aircraft to manage safe navigation on their own.
• D. It is not feasible to increase the range of radars.

Answer 1

The correct option is C Computers on board may enable aircraft to manage safe navigation on their own.

The question asks to identify the cause for the mentioned effect.
In the 3rd paragraph, the author specifies, “The new free-flight concept will probably supplement the existing air traffic control system by computers on each plane to map the altitude, route, weather and other planes; and a decade from now; there will be no use of radar any more”.
Clearly, the author is pointing towards the technology (computers on board) which will help aircrafts navigate by themselves, eventually putting radars out of use. The author does not relate this to enemy detection or range of radar anywhere in the passage. So, options (a), (b) and (d) can be eliminated.
Hence, option (c) is the correct answer.