Question

Ravi wanted to find out which part of his school was most polluted. He smeared Vaseline on cellophane paper pieces of the same size and kept them in four different places. His observations are shown below.
Figure

Which place in his school is the most polluted?
(a) playground
(b) classroom
(c) canteen
(d) library

Answer 1

(c) canteen
The cellophane paper smeared with vaseline and kept in the canteen has maximum pollutants sticked to it. Therefore, canteen is most polluted area.