1.  Questions: four subjects - Physics, Chemistry, Mathematics, and Biology - were taught in four consecutive periods of one hour each starting from 8.00 a.m. At what time was the Chemistry period scheduled ?
Statements:

I.   Mathematics period ended at 10.00 a.m. , which was preceded by Biology.
II.  Physics was scheduled in the last period.
III. Mathematics period was immediately followed by Chemistry.

A. Only I
B. Either I only or II only
C. Only I and III
D. All I, II, and III
E. Only I and either II or III

Answer: Option E

Explanation:

From I and II, we conclude that Mathematics Period began at 9.00 a.m. , Biology period began at 8.00 a.m. and Physics period began at 11 a.m. So, the Chemistry period began at 10.00 a.m.