SSC CGL 2023 PYQ — Question 73

The correct answer is Option 1 i.e. 37.7.

It is given that the internal diameter is equal to the outer diameter

⇒ 2r = R

We know that,

The volume of the cylinder = π(R² - r²)h and,

Water in pipe = Internal base × h

Now, according to the question

Water in pipe = 88/7

⇒ πr² × h = 88/7

⇒ 22/7 × r² × 1 = 88/7

⇒ r² = 4

⇒ r = 2 cm

So,

⇒ R = 2r = 4 m

Now, 

The material used = Volume of the pipe

Material used = π(R² - r²)h

⇒ 22/7 × (4² - 2²) × 1 = 37.3 m³