Child and adolescent psychiatry: calculating ratio IQ: practice question

A Psychiatry question in the style of the NEET PG paper. Answer it first, then read why the right option is right and why each of the others is wrong.

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Psychiatry · Child and adolescent psychiatry: calculating ratio IQ

Sample item

An 8-year-old child is found to have a mental age of 6 years on a standardised test. What is the ratio IQ?

Original practice item, not a recalled exam question. Nothing here is recorded.

The answer and the reasoning

A. 75

Ratio IQ is mental age divided by chronological age, multiplied by 100. Here 6 divided by 8 is 0.75, giving an IQ of 75.

Option by option

  • A. 75 (correct)

    Correct. 6 divided by 8, multiplied by 100, gives 75.

  • B. 60

    This multiplies the mental age by ten and ignores chronological age.

  • C. 133

    This results from dividing 8 by 6, inverting the ratio.

  • D. 48

    This multiplies the two ages together instead of dividing.

Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.

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Questions about this Psychiatry question

What is the answer to this Psychiatry question?

The best answer is A, 75. Ratio IQ is mental age divided by chronological age, multiplied by 100.

Why is "60" not the answer?

This multiplies the mental age by ten and ignores chronological age.

Why is "133" not the answer?

This results from dividing 8 by 6, inverting the ratio.

Why is "48" not the answer?

This multiplies the two ages together instead of dividing.

What concept does this question test?

It tests Child and adolescent psychiatry: calculating ratio IQ in Psychiatry. Here 6 divided by 8 is 0.75, giving an IQ of 75.

How hard is this question?

We tag it as an application question: it asks you to use a fact on a patient or a finding. The tag is our own editorial judgement, not an official difficulty rating, so read the reason for every option, not only the answer.

How should I study Child and adolescent psychiatry: calculating ratio IQ?

Learn each diagnosis by its core features and its first-line treatment. Then use the flashcards and the other Psychiatry questions on this site to test what stuck.

Is this a real NEET PG question?

No. It is an original practice item (editorial status: sample, version 1). NextPrep does not publish recalled or leaked questions, and independent faculty review of this item has not been completed yet, so confirm important facts in a standard textbook.