Four students Akash, Bikram, Ramesh and Dewan joined a college in 1991, 1992, 1993 and 1994 but not necessarily in that order. Each student joined one of the four departments, viz. Physics, Chemistry, Mathematics and Biology. No two students joined the same department. One of those who joined the college before 1993 joined Chemistry. No one joined the college after Ramesh. Dewan joined Physics. Akash joined one year after Dewan but didn’t join Chemistry. The student who joined in 1992, joined the department of

Correct option is A

Solution:
· Dewan joined Physics.
· Akash joined one year after Dewan, so Akash joined in 1993. He did not join Chemistry.
· The student who joined in 1992 cannot be Dewan (who joined in 1991) or Akash (who joined in 1993), so the student who joined in 1992 must be Bikram.
· Bikram cannot join Physics (Dewan already did) and cannot join Chemistry because Akash did not join Chemistry. Therefore, Bikram must have joined Mathematics.
· Ramesh joined in 1994, and he must have joined Biology since the other departments are already assigned.
Thus, the student who joined in 1992 (which is Bikram) did not join Chemistry. Physics is the correct department for the student who joined in 1991, which is Dewan.
Final Answer:
(a) Physics.