Question

Half cubic metre of gold sheet is extended by hammering so as to cover an area of 1 hectare. The
thickness of the sheet is
(A) 0.0005 cm (B) 0.005 cm (C) 0.05 cm (D) 0.5 cm

Answer 1

So, what we've got here is half cubic meter of gold sheet which is same thing as 0.5m^3 gold.

Now if we're gonna spread it over an area of 1 hectare i.e 10,000 m^2.

let it's thickness be "t". Now even if we're gonna spread it over a large area, the volume would remain the same.

So,

t × 10,000 = 0.5 m^3
t = 0.5/10,000
= 5/100,000
= 5 × 10^5m

Let's change it into cm,
hence it becomes,
5 × 10^3
=0.005cm

Hence, option B is correct.

Answer 2

Answer:

Step-by-step explanation:

Volume of Gold = {(1/2)×100×100×100} cm3

Area Of Sheet = 10,000 m2 = (10,000×100×100) cm2

Thickness of the sheet=

(1×100×100×100)÷(2×10,000×100×100) cm

=0.005 cm