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Q: Which of the following is a direct measurement instrument for registering the number of revolutions of a wheel?
  • A. Passometer
  • B. Pedometer
  • C. Pacing
  • D. Speedometer
Correct Answer: Option D - Odometer or speedometer– The odometer or speedometeris an instrument for registering the no. of revolution of a wheel. The odometer is fitted to a wheel which is rolled along the line whose length is required. The no. of revolution registered by the odometer can then be multiplied by circumference of the wheel to get the distance. Pedometer–It is a device similar to the passometer except that it is adjusted to the length of the pace of the person carrying it, it registers the total distance covered by any number of paces.
D. Odometer or speedometer– The odometer or speedometeris an instrument for registering the no. of revolution of a wheel. The odometer is fitted to a wheel which is rolled along the line whose length is required. The no. of revolution registered by the odometer can then be multiplied by circumference of the wheel to get the distance. Pedometer–It is a device similar to the passometer except that it is adjusted to the length of the pace of the person carrying it, it registers the total distance covered by any number of paces.

Explanations:

Odometer or speedometer– The odometer or speedometeris an instrument for registering the no. of revolution of a wheel. The odometer is fitted to a wheel which is rolled along the line whose length is required. The no. of revolution registered by the odometer can then be multiplied by circumference of the wheel to get the distance. Pedometer–It is a device similar to the passometer except that it is adjusted to the length of the pace of the person carrying it, it registers the total distance covered by any number of paces.