With reference to the Tropic of Cancer, which of the following iron and steel plants is the odd one out?

Correct answers: (c) Bokaro or (d) Jamshedpur

Explanation

There are two ways to see the odd one out:

• By ownership: Rourkela, Bhilai and Bokaro are public-sector plants of SAIL, built with foreign help (Germany, the USSR, the USSR). Jamshedpur is the private-sector plant of Tata Steel (TISCO, 1907). So Jamshedpur is the odd one out.
• By the Tropic of Cancer (23½° N): Bokaro (about 23.7° N) is the only one north of the Tropic; Rourkela (22.2° N), Jamshedpur (22.8° N) and Bhilai (21.2° N) lie south of it.

The book's key is (d), Jamshedpur, the only private-sector plant. By the Tropic of Cancer named in the question, Bokaro is the only plant north of it, so (c) is also accepted.