Page 84 - WCS - Electrical

WORKSHOP CALCULATION & SCIENCE - CITS

Rectangular Solid (or) Cuboid

1 Find its volume and T.S.A if a tank is 20 m long, 15 m broad and 12 m high.
l = 20m
b = 15 m
h = 12 m

v = ?
T.S.A = ?
Volume v = lbh unit³
= 20 x 15 x 12
= 3600 m³

T.S.A = 2(lb + bh + hl) unit²
= 2((20 x 15) + (15 x 12) + (20 x 12))
= 2 (300 + 180 + 240)
= 1440 m²
2 Find out its height if the cross section is 260 mm length and 180 mm wide rectangular and the capacity of a
fuel tank is 10500 cm³.
l = 260mm = 26 cm
b = 180 mm =18 cm

v = 10500 cm3
h = ?
l.b.h = volume
26 x 18 x h = 10500
10500
h =
26x18
= 22.44 cm
3 How many litres of water it can store if a water tank has the following dimensions length = 1 metre, width = 0.8
metre and height = 1.2 metre?
Volume = l x b x h unit³
= 1 x 0.8 x 1.2

= 0.96 m³ [1 m³ = 1000 litres]
= 0.96 x 1000
= 960 litres of water can store in the tank.
4 Find its volume if the base of a prism is a rectangle having 5m length, 4m breadth and the height of the prism
is 15m.
The base of prism is rectangle
Area of base = length x breadth
= 5 x 4

= 20 square m

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CITS : WCS - Electrical - Exercise 6