Units and Measurement – Solutions

1. Fill in the blanks
(a) The volume of a cube of side 1 cm is equal to …m³.
(b) The surface area of a solid cylinder of radius 2.0 cm and height 10.0 cm is equal to ….(mm)².
(c) A vehicle with a speed of 18 km h^-1 covers…m in 1 s.
(d) The relative density of lead is 11.3. its density is… g cm^-3 or….kg m^-3.
Solution:
(a) Given that
Length of side, a= 1cm
a=10^-2 m.
Volume of cube, V=a³ = (10^-2) m³ =10^-6 m³
(b) According to the question it is given that
Radius of solid cylinder, r=2.0 cm
r= 20 mm [1 cm = 10 mm]
And height of cylinder = h= 10 cm