Question -
Q. Which one of the following statements describes 'Odometer'?
Options:
A .  It is an instrument used to measure a ship's speed relative to the water.
B .  An instrument used to measure distance travelled by moving vehicle
C .  It is an instrument to measure length of arbitrary curved lines.
D .  It is a device used to locate objects underwater.
Answer: Option B : B Explanation: Option (a) is incorrect: Pitometer logs (also known as pit logs) are devices used to measure a ship's speed relative to the water. Option (b) is correct: An odometer or odograph is an instrument used for measuring the distance traveled by a vehicle, such as a bicycle or car. The device may be electronic, mechanical, or a combination of the two (electromechanical). Option (c) is incorrect: An opisometer, also called a curvimeter, meilograph, or map measurer, is an instrument for measuring the lengths of arbitrary curved lines. Option (d) is incorrect: Sonar is a device for finding objects underwater using sound waves. Sonars transmit ultrasonic waves into the water below and receive the returning echoes from the seabed.
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