Statement 1: In a series LCR circuit at resonance condition power consumed by ciccuit is maximum.
Statement 2 : At resonance condition, the effective resistance of circuit is maximum.

Explanation

On inserting inside the inductor, the iron rod getws magnetised, and the magnetic field inside it increases. Thue the indcutance of the coil increases. This further increases the value of inductive reactance, due to which the voltage across the bulb decreases and it brightness decreases.