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Q: Which is used for measuring speed of motor-
  • A. Speedometer
  • B. Voltmeter
  • C. Velometer
  • D. Lactometer
Correct Answer: Option A - A speedometer is a device used to measure the travelling speed of a vehicle, usually for the purpose of maintaining a sensible speed.
A. A speedometer is a device used to measure the travelling speed of a vehicle, usually for the purpose of maintaining a sensible speed.

Explanations:

A speedometer is a device used to measure the travelling speed of a vehicle, usually for the purpose of maintaining a sensible speed.