Question

A block of steel of size 5 cm $\times$ 5 cm $\times$ 5 cm is weighed in water. If the relative density of steel is 7. Its apparent weight is

• A. 6 $\times$ 5 $\times$ 5 $\times$ 5 gf
• B. 4 $\times$ 4 $\times$ 4 $\times$ 6 gf
• C. 5 $\times$ 5 $\times$ 5 $\times$ 7 gf
• D. 4 $\times$ 4 $\times$ 4 $\times$ 4 gf

Answer 1

The correct option is A 6 $\times$ 5 $\times$ 5 $\times$ 5 gf

block of steel of size 5 cm 5 cm 5 cm
weight in air$=5\times 5\times 5\times 5\times 7gf$
up thrust $=5\times 5\times 5\times 5\times 1gf$
apparent weight $=5\times 5\times 5\times 5\times 7-5\times 5\times 5\times 5\times 1gf$
$=5\times 5\times 5\times 5\times 6gf$