Question

Which formula measures Intelligence Quotient (IQ)?

• A. \(\dfrac{\text{Chronological Age}}{\text{Mental Age}} \times 100\)
• B. \(\dfrac{\text{Mental Age}}{\text{Chronological Age}} \times 100\)
• C. Chronological Age + Mental Age
• D. None of these \medskip \textbf{Correct Answer:} (B) \(\dfrac{\text{Mental Age}}{\text{Chronological Age}} \times 100\) \medskip

Hint:

“M over C times 100” is the mnemonic.

Answer 1

The Correct Option is B

Step 1: Classic (Stern) formula. \(\displaystyle IQ = \frac{MA}{CA} \times 100\). If a 10-year-old performs at 12-year level, \(IQ=120\).
Step 2: Why others are wrong. (A) inverts the ratio; (C) is meaningless; (D) is false because (B) is correct.
Step 3: Conclude. \[ \boxed{\text{(Mental Age / Chronological Age) × 100 (Option B).}} \]