Which of the foll. pairs consist of fundamental quantities?

Question

i) Mass & Weight
ii)Time & Current
iii) Mass & length

a) i only
b) ii only
c) i & ii only
d) ii & iii only

Answer 1

mass, length, time, current, luminous intensity and solid angle steradians r fundamental. Rest all can b expressed by these alone.

Darren G - missed d last 1.

So ur ans is option D

Answer 2

Weight is not a fundamental quantity; it is a derived quantity.

But in the case of current, it is a derived quantity derived from the quantity force.

From the three fundamental quantities mass, length and time any other physical quantity can be derived.

Only in S.I systems of measurement in order to simplify mathematical manipulation, the unit of current is also chosen as one of the base unit. But the quantity is not fundamental.

Therefore, the answer to the question is mass and length alone is fundamental quantities.

Again the question has to be modified, because the quantity weight and current contains in it mass length and time.

Answer 3

Weight is derived from mass, so a and c are wrong. I don't think current is a fundamental quantity. So I would choose iii. But due to the fact that iii isn't a choice, maybe current is fundamental.

Answer 4

I would have said "iii only" but that's not one of the choices.
So I'll vote for letter "d" - "ii and iii only".

Weight is derived from mass, so it's not fundamental, eliminating "a" and "c".

Not 100% sure though.

Answer 5

i) mass (kg)
ii) time (s)
iii) mass (kg) and length (m)

So if your question was, which pair consists of fundamental quantities only, then all options a) to d) would be wrong in my eyes, since only the pair iii) would be the answer.

Answer 6

D definitely
Fundamental quantities
mass, time, current, length (or distance), and luminous intensity (in candelas). Probably i'm missing out something

Answer 7

D

Answer 8

D.

Answer 9

d.