CGPET 2019 Solved Paper

Given, P≠R
The reading of the galvanometer is same with S open or closed i.e., the value of current in branch CD is zero. Hence, the potential at points C and D is same i.e., VC=VDHence, the value of current in branch ADB and ACB is same, i.e. IP=IQ
IR=IG
Hence, option (a) is correct.