alleryA 12-year-old has an IQ of 90. What is the mental age?
A10.8 years
B13.3 years
C9.0 years
D12.0 years
Answer & Solution
Correct answer: A. 10.8 years
1. Recall the fact: MA = IQ x CA / 100 = 90 x 12 / 100 = 10.8 years.
2. The option "10.8 years" matches it.
3. Why the others fail: 13.3 comes from dividing instead of multiplying; 12 would give IQ 100.
4. Check the stem wording against the fact: only one option satisfies both.
_Source: NCERT Class XII Psychology, Ch 1 Variations in Psychological Attributes (lepy101.pdf), "Assessment of Intelligence"_
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