Quantitative Aptitude Ques 93

Question: Assume that a drop of water is spherical and its diameter is one-tenth of 1 cm. A conical glass has a height equal to the diameter of its rim. If 32000 drops of water fill the glass completely, then the height of the glass (in cm) is

Options:

A) 1

B) 8

C) 3

D) 4

Show Answer

Answer:

Correct Answer: B

Solution:

  • Let the radius of rim of the glass be r, Height of glass = 2r According to the question, $ 32000\times \frac{4}{3}\pi \times \frac{1}{10}\times \frac{1}{10}\times \frac{1}{10}=\frac{1}{3}\pi \times r^{2}\times 2r $

$ \Rightarrow $ $ \frac{32000\times 4}{1000}=2r^{3} $

$ \Rightarrow $ $ r^{3}=64 $
$ \Rightarrow $ $ r=4 $

$ \therefore $ Height of glass = 2r = 8 cm