Environmental health: natural ventilation: practice question

A PSM 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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PSM · Environmental health: natural ventilation

Sample item

Natural ventilation of a house is most effectively achieved by:

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

The answer and the reasoning

D. Cross ventilation with windows on opposite walls

Cross ventilation uses wind pressure differences between opposite openings and thermal differences to move air through the room, giving the best natural air exchange. Fans and air conditioners are mechanical means.

Option by option

  • A. Windows on one side only

    Single-side windows give poor air exchange.

  • B. Air conditioning

    Air conditioning is mechanical and not natural.

  • C. Closed windows with an exhaust fan

    An exhaust fan is mechanical ventilation.

  • D. Cross ventilation with windows on opposite walls (correct)

    Correct. Opposite openings enable cross ventilation.

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.

More PSM questions

Questions about this PSM question

What is the answer to this PSM question?

The best answer is D, Cross ventilation with windows on opposite walls. Cross ventilation uses wind pressure differences between opposite openings and thermal differences to move air through the room, giving the best natural air exchange.

Why is "Windows on one side only" not the answer?

Single-side windows give poor air exchange.

Why is "Air conditioning" not the answer?

Air conditioning is mechanical and not natural.

Why is "Closed windows with an exhaust fan" not the answer?

An exhaust fan is mechanical ventilation.

What concept does this question test?

It tests Environmental health: natural ventilation in PSM. Fans and air conditioners are mechanical means.

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 Environmental health: natural ventilation?

Practise biostatistics with small calculations until sensitivity, predictive values and risk measures are automatic. Then use the flashcards and the other PSM 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.