Match the following physical quantities with units.
Physical quantity
Unit
A.
Molarity
(i).
mol kg–1
B.
Molality
(ii).
mol L–1
C.
Pressure
(iii).
Candella
D.
Luminous intensity
(iv).
Pascal
Codes:
A
B
C
D
1.
(i)
(iv)
(ii)
(iii)
2.
(ii)
(i)
(iv)
(iii)
3.
(i)
(iv)
(iii)
(ii)
4.
(iv)
(i)
(iii)
(ii)
Hint: Unit of Luminous intensity=candela
Explanation:
A. Molarity=concentration in mol L-1
B.
C. The SI unit for pressure is the pascal (Pa), equal to one newton per square metre (N/m2 or kg. m-1 s-2). This special
name for the unit was added in 1971; before that, pressure in SI was expressed simply as N/m2.
D. Unit of luminous intensity=candela
The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency hertz and that has a radiant intensity in that direction of 1/683 watt per steradian.
