Question

Which of the below-given options are not fundamental units?

• A. $\mathrm{cm}$
• B. $\mathrm{kg}$
• C. $\mathrm{centigrade}$
• D. $\mathrm{volt}$

Answer 1

The correct option is D

$\mathrm{volt}$

Step 1: Explanation of the correct option

In the case of option D,

1. Fundamental units are those base units that are defined by the International System of Units.
2. There are seven base units which are as follows:-
   1. Meter (m) for Length
   2. Kilogram (kg) for Weight
   3. Second (s) for Time
   4. Kelvin (K) for temperature
   5. Ampere (A) for Electric current
   6. Candela (cd) for Luminous intensity
   7. Mole (mol) for Amount of substance
3. Derived units are those units of measurement that are derived from the seven fundamental units.
4. A volt is a derived unit that is used for measuring the electric potential, electric potential difference, and electromotive force.

Step 2: Explanation for the incorrect options

In the case of option A,

1. A centimeter is a unit measuring the length of an object in the metric system.
2. It is abbreviated as $\mathrm{cm}$.

In the case of option B,

1. A kilogram is a fundamental unit for measuring mass.
2. It is abbreviated as $\mathrm{kg}$.

In the case of option C,

1. Centigrade is basically a scale that is used for measuring the temperature.
2. In this scale, the freezing point of water is $0°\mathrm{C}$, and the boiling point of water is $100°\mathrm{C}$.

Hence, option D is the correct answer.