Find out mental age of a 14 year old girl, Radhika with an IQ of 100.
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → 14 years
The Intelligence Quotient (IQ) is mental age divided by chronological age, multiplied by 100:
IQ = (MA ÷ CA) × 100
Given: IQ = 100, CA = 14 years
100 = (MA ÷ 14) × 100, so MA ÷ 14 = 1
MA = 14 years
The rule is that when the MA equals the CA, the IQ equals 100. An IQ of 100 means Radhika performs at the average level of 14-year-olds, so her mental age equals her age.
NCERT (2025-26): “Assessment of Intelligence … In 1912, William Stern, a German psychologist, devised the concept of Intelligence Quotient (IQ). IQ refers to mental age divided by chronological age, and multiplied by 100.…” “The number 100 is used as a multiplier to avoid the decimal point. When the MA equals the CA, the IQ equals 100. If MA is more than the CA, IQ is more than 100. IQ becomes less than 100 when the MA is less than the CA.…” |