<prompt> A child of 10 years has a mental age of 2 years, his IQ level is:-20 IQ points30 IQ points50 IQ points70 IQ points  <response>: IQ Mental age Chronological age x 100 In the given question, chronological age is 10 years and mental age is 2 years. Thus, IQ level of this child 210 x10020 IQ points. Such a child will be an Idiot child with Severe mental retardation. Normal IQ 70 or above Mild mental retardation 50-70 Moderate mental retardation 35-49 Severe mental retardation 20-34 Profound mental retardation 20 