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A dimensionless quantity (a) never has a unit, (b) always has a unit, (c) may have a unit, (d) does not exist.

Mathematics
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I had one of those once, and it did not have a unit.
What was it then?
What is the unit of Pi?

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Other answers:

No unit
what a unit of 25ºC
The unit is Celcius degree @myko
Can be converted to Fahrenheit units by a sharp student.
so the answer is (c) may have a unit. Other definition for dimensionless quantity is scalar quantity
Yeah But give an example with a unit and without a unit!
i just did. And @radar gave with no units
@radar also can convert it to Fahrenheit if you whant
I need Examples One is temperature with a UNiT! So without unit?
In my humble opinion, the best answer would be "a"
ohh why!?
Pi has no unit, just a value and an irrational value at that.
I desagree: http://en.wikipedia.org/wiki/Dimensionless_quantity
So why is it not unitless?
Plancks constant is just a value, no unit, it is just used to convert things that have a dimehnsion, ft, in. grams, degrees, lbs, etc. these are dimensionsal units.
oh yes!
Review that link provided by @rkparth5770 and make a decision.
What?! i did not provide any
Thanks @rkparth5770 for providing additional info on this "dimensionless" subject.
Welcum @radar
Hmmm... in my physics book, Planck's constant is 6.626...x10^(-34) Js , which is with a unit :S
Just picked that out of the dark @Callisto, didn't realize that Plalnck's constant was in some kind of unit. Should of stuck with Pi lol.
in SI units planks constant certainly does have dimensions, , that is why Max Plank devise his own set of units that made it, along with other constants like the gravitational constant and the speed of light dimensionless. i dont like the wording of the options, i would phrase the answer as " a dimensionless quantities has units that cancel out" for example \[\pi=\frac{C[{l}]}{d[l]}=\frac{C[\text{cm}]}{d[\text{cm}]}=\frac{C\cancel{[\text{cm}]}}{d\cancel{[\text{cm}]}}=\frac{C}{d}\]
Yes indeed Plancks constant does have units. I looked up (Google): Planck's constant = 6.626068 × 10^-34 m^2 kg / s Thanks UnkleRhaukus for the review.
Yes indeed Plancks constant does have units. I looked up (Google): Planck's constant = 6.626068 × 10^-34 m^2 kg / s Thanks UnkleRhaukus for the review.
Yes indeed Plancks constant does have units. I looked up (Google): Planck's constant = 6.626068 × 10^-34 m^2 kg / s Thanks UnkleRhaukus for the review.

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