Correct Answer:
A. Radar
Correct answer: Radar. Robert Watson-Watt developed radar in the 1930s.
Background: RADAR stands for Radio Detection And Ranging. Robert Watson-Watt developed it in Britain in the 1930s to detect aircraft.
- Needle: He did not invent the needle.
- Tube light: He did not invent the tube light.
- None of these: “None of these” is incorrect because radar is correct.
Did you know? Radar helped Britain in the Battle of Britain in 1940.
Memory trick: Watson-Watt → RADAR.
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