Question

Which of the following is used for measuring the mass of costly substances such as gold, silver or diamonds?

• A. Electronic or Digital balance
• B. Physical Balance
• C. Barometer
• D. (a) and (b) above.

Answer 1

The correct option is D (a) and (b) above.

For measuring the mass of costly substances such as gold, silver, diamonds we use a physical balance or an electronic balance. These are very accurate balances and can show even a very small difference in mass.
Barometer is a device used to measure atmospheric pressure and cannot measure the mass of a body directly.