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1)

A beam 9m long, 40 cm wide and 20 cm deepis made up of iron whihc weights 50 kg per cubic metre.FInd the weight of the beam?


A) 30 kg

B) 35 kg

C) 36 kg

D) 40 kg

Answer:

Option C

Explanation:

Volume of the beam=lbh =9×40100×20100=72100m3

The weight of the iron beam is given as  1m3=50kg

72100m3=72100m3 =72100×50=36kg