Equipment: oxygen cylinder: practice question

A Anaesthesia 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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Anaesthesia · Equipment: oxygen cylinder

Sample item

A full oxygen cylinder has a pressure of about 137 bar (about 2000 psi). How is the content estimated?

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

The answer and the reasoning

D. Pressure is proportional to content, since oxygen is stored as a gas

Oxygen is a gas well above its critical temperature (-118 degrees C), so by Boyle's law the pressure falls in direct proportion to the volume left.

Option by option

  • A. By weighing only

    Weighing is needed for liquefied gases.

  • B. Pressure remains constant until empty

    That behaviour applies to nitrous oxide.

  • C. By measuring temperature only

    Temperature does not indicate the volume.

  • D. Pressure is proportional to content, since oxygen is stored as a gas (correct)

    Correct. Gauge pressure indicates content for oxygen.

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 Anaesthesia question

What is the answer to this Anaesthesia question?

The best answer is D, Pressure is proportional to content, since oxygen is stored as a gas. Oxygen is a gas well above its critical temperature (-118 degrees C), so by Boyle's law the pressure falls in direct proportion to the volume left.

Why is "By weighing only" not the answer?

Weighing is needed for liquefied gases.

Why is "Pressure remains constant until empty" not the answer?

That behaviour applies to nitrous oxide.

Why is "By measuring temperature only" not the answer?

Temperature does not indicate the volume.

What concept does this question test?

It tests Equipment: oxygen cylinder in Anaesthesia. The correct option holds because: Correct. Gauge pressure indicates content for oxygen.

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 Equipment: oxygen cylinder?

Make a table of each agent, its key advantage and its main side effect. Then use the flashcards and the other Anaesthesia 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.