Which among the following is the major cause of acid rain?
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Polio is a disease caused by which of the following?
In the following question, out of the four alternatives, select the word similar in meaning to the word given.
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What is the name of the process where gas is directly converted to solids called?
Ozone is represented as _____.
Nepal shares a border with which other country besides India?
Which is the deepest trench (steep depression in ocean) in the world?
Which among the following games was very popular in ancient India?