Equipment: nitrous oxide 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: nitrous oxide cylinder

Sample item

How is the amount of nitrous oxide remaining in a cylinder best determined?

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

The answer and the reasoning

B. By weighing the cylinder

Nitrous oxide is stored as a liquid, so the pressure stays constant at about 745 psi (at 20 degrees C) until the liquid is exhausted. Only weighing shows the content.

Option by option

  • A. By reading the pressure gauge

    The gauge stays constant until the liquid is exhausted.

  • B. By weighing the cylinder (correct)

    Correct. Weight reflects the contents of a liquefied gas.

  • C. By measuring the temperature

    Temperature does not measure content directly.

  • D. By observing the flowmeter

    A flowmeter shows flow rate.

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 B, By weighing the cylinder. Nitrous oxide is stored as a liquid, so the pressure stays constant at about 745 psi (at 20 degrees C) until the liquid is exhausted.

Why is "By reading the pressure gauge" not the answer?

The gauge stays constant until the liquid is exhausted.

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

Temperature does not measure content directly.

Why is "By observing the flowmeter" not the answer?

A flowmeter shows flow rate.

What concept does this question test?

It tests Equipment: nitrous oxide cylinder in Anaesthesia. Only weighing shows the content.

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: nitrous oxide 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.