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Calculate the reading on a passive mechanical dial gauge if the pointer deflects by 15 divisions, each division representing 0.02 mm. What is the measured displacement?

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Free Inspector Of Legal Metrology Practice Questions

Category No: 613/2025 The Inspector of Legal Metrology exam is conducted by the Kerala Public Service Commission for recruitment to the Kerala Government Service. This exam tests candidates' knowledge in science and engineering disciplines relevant to legal metrology, along with proficiency in Malayalam. Successful candidates will be appointed as Inspectors, responsible for enforcing legal metrology laws and regulations. Direct Recruitment Graduation/Diploma Required Pay Scale ₹43,400 – 91,200 Age Limit 18-36 Years Kerala PSC Online Application Malayalam Language Apply by 04.02.2026

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Q1. Calculate the reading on a passive mechanical dial gauge if the pointer deflects by 15 divisions, each division representing 0.02 mm. What is the measured displacement?

  1. 0.3 mm
  2. 0.15 mm
  3. 3 mm
  4. 0.02 mm

Q2. Calculate the power consumption in watts of an active measuring instrument operating at 24 volts and drawing a current of 0.5 amperes.

  1. 12 W
  2. 48 W
  3. 0.48 W
  4. 24 W

Q3. An inspector encounters two measuring instruments: one uses a mechanical spring principle, and the other uses an electronic sensor. According to classification, these instruments belong to which categories respectively?

  1. Mechanical and Electrical
  2. Electronic and Mechanical
  3. Electrical and Hydraulic
  4. Hydraulic and Pneumatic

Q4. Consider a weighing instrument that measures mass by balancing an unknown weight against a known standard. Under which classification does this instrument fall?

  1. Direct reading instrument
  2. Comparative instrument
  3. Digital instrument
  4. Non-mechanical instrument

Q5. Compare the advantages of analog instruments over digital instruments in the context of legal metrology inspections.

  1. Analog instruments generally have higher precision and are easier to calibrate than digital instruments.
  2. Analog instruments provide continuous readings and can be easier to interpret in fluctuating measurement conditions.
  3. Analog instruments store measurement data electronically for detailed analysis later.
  4. Analog instruments are immune to environmental noise and interference unlike digital instruments.

Q6. An active instrument used for measuring electrical current requires a 12V DC power supply to function. If the power supply fails, what is the expected behavior of the instrument?

  1. It will continue measuring accurately using stored energy.
  2. It will stop functioning and not provide measurements.
  3. It will switch to mechanical measurement mode automatically.
  4. It will provide approximate measurements without power.

Q7. Which of the following best describes the primary basis for classifying measuring instruments in legal metrology?

  1. The physical size of the instrument
  2. The principle of measurement employed
  3. The country of manufacture
  4. The color and design of the instrument

Q8. Which of the following best describes a digital measuring instrument?

  1. An instrument that uses analog dials to display measurements
  2. An instrument that converts physical quantities into digital signals for display
  3. An instrument that measures only electrical quantities
  4. An instrument that requires manual calculation of measurements

Q9. In a scenario where an active instrument and a passive instrument are used to measure the same physical quantity, which of the following statements is generally true?

  1. Active instruments usually provide higher sensitivity and faster response.
  2. Passive instruments always provide more accurate measurements.
  3. Active instruments do not require calibration.
  4. Passive instruments consume more power than active instruments.

Q10. Which of the following best defines a passive measuring instrument?

  1. An instrument that requires an external power source to operate.
  2. An instrument that does not require any external power source for its operation.
  3. An instrument that converts electrical signals into mechanical readings.
  4. An instrument that actively modifies the quantity being measured.

Q11. Consider two measuring instruments: one passive and one active. Which characteristic is unique to passive instruments?

  1. They require batteries or external power to function.
  2. They measure quantities without altering them or needing power.
  3. They provide digital readouts through electronic circuits.
  4. They can automatically calibrate themselves during measurement.

Q12. In terms of accuracy and ease of reading, how do digital instruments generally compare to analog instruments?

  1. Digital instruments are less accurate but easier to read than analog instruments
  2. Digital instruments are more accurate and easier to read than analog instruments
  3. Digital instruments are equally accurate but harder to read than analog instruments
  4. Digital instruments are less accurate and harder to read than analog instruments

Q13. Which of the following best describes an analog measuring instrument?

  1. An instrument that provides a digital readout of measurements.
  2. An instrument that indicates measurement values using a continuous scale or pointer.
  3. An instrument that stores measurement data electronically for later analysis.
  4. An instrument that uses binary code to represent measurement values.

Q14. An inspector is using an analog pressure gauge to measure the pressure in a gas cylinder. The gauge has a scale from 0 to 100 psi with 1 psi divisions. If the pointer is halfway between 45 psi and 46 psi, what is the approximate pressure reading?

  1. 44.5 psi
  2. 45.5 psi
  3. 46.5 psi
  4. 45.0 psi

Q15. Conceptually, what is the primary difference between analog and digital measuring instruments in terms of data representation?

  1. Analog instruments represent data in discrete numerical values, digital instruments use continuous signals.
  2. Analog instruments use continuous signals to represent data, digital instruments use discrete numerical values.
  3. Both analog and digital instruments represent data using continuous signals.
  4. Both analog and digital instruments represent data using discrete numerical values.
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