<prompt> Carharts notch seen at:0.5 KHz1 KHz2 KHz4 KHz  <response>: Ans: c 2 KHz Ref: Dhingra, 3rd ed, p. 115 p. 87Dip in bone conduction in otosclerosis maximum occurs at 2000 Hz called Carhart notchDip Disappears after successful stapedectomy2 KHz dip - Otosclerosis4 KHz dip - Noise induced hearing loss8 KHz dip - Senile otosclerosis 