1.

Fill in the blanks (a) The volume of a cube of side 1 cm isk equal to….. `m^3` (b) the surface area fo a solid cylinder of radius 2.0 cm and height 10.0 cm is equal to …. `(mm)^2` (c ) A vehical moving with a speed of `18km h^(-1)` covers ....m in 1s. (d) The relative density of lead is 11.3. its density is ......g `cm^(-3) or .....kg m^(-3)`

Answer» (a) Here, length of side, `L = 1 cm =10^(-2)m`
Volume of cube `= L^3 = (10^(-2)m)^3 = 10^(-6)m^3`
(b) Here, r = 2.0cm = 20mm, h= 10.0cm = 100cm
Surface area of solid cylinder ` =(2pi r) h = 2xx(22)/(7)xx20xx100mm^2 = 1.26xx10^4 mm^2`
(c ) Here, speed `upsilon = 18 km h^(-1) = (18xx1000m)/(60xx60s) = 5ms^(-1) = 5ms^(-1)` :. Distance covered in 1 second =5 m
Here, relative density = 11.3 `:. dentisy = 11.3 g//cc = (11.3xx10^(-3)kg)/((10^(-2)m)^2) = 11.3xx10^3 kg m^(-3)`


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