Which of the following pairs is wrong?

Correct option is B

Correct Answer: (b) Relative density (Liquid) – Pyrometre

Explanation:

• A pyrometer is an instrument used to measure high temperatures, especially in furnaces.

• Relative density of a liquid is measured using a hydrometer, not a pyrometer.

Information Booster:

• Relative density is the ratio of the density of a substance to the density of water. It has no unit and is measured using a hydrometer.

• Instruments must match the property they are designed to measure—accuracy depends on using the correct one.

Additional Information:

• (a) Pressure – Barometre

  • Correct: A barometer measures atmospheric pressure.

• (c) Temperature – Thermometre

  • Correct: A thermometer measures temperature.

• (d) Earthquake – Seismograph

  • Correct: A seismograph records the intensity and duration of earthquakes.