Radar — Questions and answers
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What was Robert Watson-Watt's key idea for how Radar could work?
Choices
- A. To make radio waves disappear when they hit something.
- B. To measure how long it takes for radio waves to bounce back after hitting an object. ✓
- C. To build giant antennas just for fun and decoration.
- D. To send secret messages using invisible waves.
Answer: B. To measure how long it takes for radio waves to bounce back after hitting an object.
From page 6
What was the name of the first working radar early warning system built along the British coast?
Choices
- A. The Great Wall
- B. Chain Home ✓
- C. Sky Watchers
- D. Invisible Fence
Answer: B. Chain Home
From page 7
How did Radar help the Royal Air Force win battles during World War II?
Choices
- A. It helped them cook food faster for the pilots.
- B. It gave them early warning of incoming enemy aircraft, helping them intercept raids. ✓
- C. It made their planes invisible to the enemy.
- D. It allowed them to send secret codes to each other.
Answer: B. It gave them early warning of incoming enemy aircraft, helping them intercept raids.
From page 8