When Monica took an IQ Test at the age of 12 she was told that she had scored an IQ of 100. Compute her Mental Age.
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → 12
Intelligence Quotient (IQ) is mental age divided by chronological age, multiplied by 100.
Given: chronological age (CA) = 12 years, IQ = 100
IQ = (MA ÷ CA) × 100
100 = (MA ÷ 12) × 100, so MA ÷ 12 = 1
MA = 12 years
When the MA equals the CA, the IQ equals 100. An IQ of 100 tells us at once that Monica’s mental age is the same as her age, 12 years.
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.…” |