CSIR NET June 2016 Q122: Meteorology
During an active (strong) phase of the Indian summer monsoon, characteristic features include an intensified Somali jet, a stronger-than-normal tropical easterly jet, and a deepened heat low with enhanced convection over peninsular India; the Tibetan anticyclone typically stays over/near Tibet or shifts westward during active spells, not eastward toward southern China.
An active monsoon phase is marked by intensification of the low-level Somali jet, strengthening of the tropical easterly jet, and negative (deepened) pressure anomalies in the heat-low region along with enhanced convection (negative pressure anomalies) over peninsular India. The Tibetan Anticyclone, however, does not shift eastward toward southern China during active spells -- an eastward retreat of the anticyclone is more typical of monsoon break conditions, not active phases. Option 2 is correct (as the one that does NOT happen).
1) This does happen during active monsoon -- Somali jet intensification is a defining feature. 2) Marked correct as NOT happening -- the Tibetan Anticyclone's eastward shift toward southern China is not characteristic of the active phase. 3) This does happen -- the tropical easterly jet strengthens during active monsoon spells. 4) This does happen -- deepened heat-low and enhanced peninsular convection are hallmarks of an active monsoon.