alleryA 10-year-old child has a mental age of 12. What is the IQ?
A83
B120
C100
D108
Answer & Solution
Correct answer: B. 120
1. Recall the fact: IQ = 12 / 10 x 100 = 120.
2. The option "120" matches it.
3. Why the others fail: 83 comes from inverting the ratio (10 / 12); 100 needs MA equal to CA.
_Source: NCERT Class XII Psychology, Ch 1 Variations in Psychological Attributes (lepy101.pdf), "Assessment of Intelligence"_
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