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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?

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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. 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

Q2. An inspector is examining a mechanical spring balance used for weighing. Which classification does this instrument fall under?

  1. Active measuring instrument
  2. Passive measuring instrument
  3. Electronic measuring instrument
  4. Digital measuring instrument

Q3. 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

Q4. 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

Q5. 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

Q6. 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.

Q7. Which of the following best defines an active measuring instrument in the context of legal metrology?

  1. An instrument that requires an external power source to operate.
  2. An instrument that measures quantities without any energy input.
  3. An instrument that only records measurements passively.
  4. An instrument that uses mechanical parts exclusively for measurement.

Q8. In which scenario would a passive measuring instrument be preferred over an active one?A) When measuring electrical signals requiring amplification.B) When power supply is unreliable or unavailable.C) When digital data output is mandatory.D) When automatic data logging is needed.

  1. Scenario A
  2. Scenario B
  3. Scenario C
  4. Scenario D

Q9. 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

Q10. 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

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. Scenario: An inspector is evaluating two measuring instruments for a legal metrology application: Instrument X is analog with a mechanical pointer, and Instrument Y is digital with an LCD display. Which of the following statements is most accurate regarding their classification and characteristics?

  1. Instrument X is classified as analog because it uses a continuous scale, while Instrument Y is digital because it displays discrete numerical values.
  2. Instrument X is digital because it uses a pointer, and Instrument Y is analog because it uses an LCD display.
  3. Both instruments are analog since they measure the same physical quantity.
  4. Both instruments are digital because modern instruments always use electronic displays.

Q13. In the context of legal metrology, how does the classification of instruments help in ensuring measurement accuracy and compliance?

  1. By grouping instruments with similar maintenance schedules
  2. By enabling standardized testing and verification procedures
  3. By allowing instruments to be used interchangeably without calibration
  4. By categorizing instruments based on their market price

Q14. A flow measuring instrument is classified as volumetric and uses the displacement principle. If the instrument measures 15 liters in 3 minutes, what is the flow rate in liters per minute?

  1. 5 liters per minute
  2. 45 liters per minute
  3. 0.2 liters per minute
  4. 18 liters per minute

Q15. 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.
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