Multiple choice

Knot is the unit of speed of the which of the following?

  1. Light waves

  2. Ship

  3. Sound waves

  4. Aeroplane
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A knot is a unit of speed equal to one nautical mile per hour (1.852 km/h), used primarily for maritime and aviation navigation. Ships and aircraft use knots because nautical miles are based on the circumference of Earth, making navigation calculations simpler. Light and sound waves use different speed units.

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