In the SI system, how many base units are there?
Correct answer: C. Seven
- A. Three
- B. Five
- C. Seven
- D. Nine
Explanation
The number of fundamental units of measurement in science is typically considered to be seven. These are the basic units from which all other units can be derived. The seven SI (International System of Units) base units are: Meter (m): This unit represents length or distance. Kilogram (kg): This unit represents mass. Second (s): This unit represents time. Ampere (A): This unit represents electric current. Kelvin (K): This unit represents temperature. Mole (mol): This unit represents amount of substance. Candela (cd): This unit represents luminous intensity.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
About Measurements
Physical quantities are expressed with SI base and derived units, while measurement limits are described through accuracy, precision, absolute and percentage error, and significant figures. Dimensional analysis checks equations, derives relationships and detects inconsistent units, but it cannot determine numerical constants or distinguish quantities with identical dimensions.
Practise Measurements
262 free Measurements MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 11 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Measurements questions
The number of fundamental units of measurement in science is:
The SI unit of power is:
In the international system of units, the unit of mass is:
The maximum possible error in the reading for a meter rod (with a least count of 1 mm) is:
The branch of science which deals with properties of matter, energy and their relationship is called:
The branch of science which deals with forces acting on bodies in motion, is called: