Which of the following instruments is used to measure the density of a liquid?
A. Refractometer
B. Hydrometer
C. Thermocouple
D. Tachometer
Answer:B
Which of the following instruments is used to measure the density of a liquid?
A. Refractometer B. Hydrometer C. Thermocouple D. Tachometer
Explanation: A hydrometer is a device used to measure the density of a liquid by determining its buoyancy in the liquid.