1. Which of the following sets cannot enter into the list of
fundamental quantities in any system of units?
(a) length, mass and velocity,
(b) length, time and velocity,
(c) mass, time and velocity,
(d) length, time and mass.
Answers
Answer a , b and c cannot enter into list of fundamental quantities as velocity is a derived quantity of meter and second
Question:-
Which of the following sets cannot enter into the list of fundamental quantities in any system of units.
a. length ,mass and velocity
b. length, time and velocity
c. mass, time and velocity
d. length, time and mass
Answer:-
a. length ,mass and velocity
b. length, time and velocity
c. mass, time and velocity
Here they cannot enter into the list of Fundamental quantities because velocity is derived quantity and these sets contain velocity which we cannot put in the fundamental quantities because we derive velocity with the help of displacement and time... Velocity is derived from metre and second....
S.I unit of velocity is metre per second m/s.
S.I unit of length is metre (m).
S.I unit of time is second (s).
S.I unit of mass is kilogram (kg).
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What are Fundamental quantities?
Quantities which are independent of other physical quantities or cannot be obtained by the combination of two or more quantities.
What are Fundamental units?
The units which can neither be derived from one another nor resolved broken into anything more basic are called fundamental units.
For example :-
Mass - kilogram
length - metre
Time - second
Temperature - kelvin
What are derived quantities?
Quantities that can be obtained by the combination of two or more fundamental quantities are called drived quantities.
What are derived units?
Any unit which can be obtained by the combination of one or more fundamental units is called derived unit.
For example:-
Acceleration - metre per square second
Velocity - metre per second
Momentum - kilogram metre per second
Force - kilogram metre per square second.
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