alleryWho proposed the two-factor theory of intelligence in 1927?
AAlfred Binet
BLouis Thurstone
CJ.P. Guilford
DCharles Spearman
Answer & Solution
Correct answer: D. Charles Spearman
1. Recall the fact: Spearman used factor analysis to propose a g-factor and s-factors in 1927.
2. The option "Charles Spearman" matches it.
3. Why the others fail: Binet proposed a one-factor view, Thurstone seven abilities and Guilford a 180-cell model.
_Source: NCERT Class XII Psychology, Ch 1 Variations in Psychological Attributes (lepy101.pdf), "Theories of Intelligence"_
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