The proportions of charcoal, saltpetre and sulphur in gun powder by weight, are respectively:

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The proportions of charcoal, saltpetre and sulphur in gun powder by weight, are respectively:

a) 15, 75, 10

b) 75, 10, 15

c) 10, 15, 75

d) 10, 75, 15

Building Materials MCQs Set-11