A simple pendulum has time period 3 seconds. The pendulum is completely immersed in a non viscous liquid whose density is 110th  of that of the material of the bob. Then time period of that pendulum is

given  dliquid=110dbody,time period of simple pendulum is,T=2πlg=   3   (given in question)    ------(1)T1=2πlg1−dliquiddbodyT1=2πlg1−110=l109 T1=2πlg109substitute (1) in above equation  T1=3×103=10 seconds.