[amp_mcq option1=”Viscometer” option2=”Anemometer” option3=”Spectroscope” option4=”Pyknometer” correct=”option4″]
The answer is D. Pyknometer.
A viscometer is an instrument used to measure the viscosity of a fluid. An anemometer is an instrument used to measure wind speed. A spectroscope is an instrument used to study the spectrum of light emitted by a substance. A pyknometer is an instrument used to measure the density of a liquid or solid.
The pyknometer is the only instrument that does not measure a physical property of a fluid. The other three instruments measure the viscosity, wind speed, and spectrum of light, respectively.