One of the following is true regarding bell or diaphragm of a sthethoscope:

Appeared in: IGNOU PB Bsc Nsg.Entrance-2026

Explanation

The diaphragm is the flat, larger part of the stethoscope's chest piece.
It is specifically designed to transmit high-pitched sounds, such as normal heart sounds (S1, S2), lung sounds, and bowel sounds.
Effective use requires pressing the diaphragm firmly against the skin, which helps to filter out lower-pitched noises.

Option A: This statement is incorrect. The bell is designed to detect low-pitched sounds, not high-pitched ones.
Option C: This is incorrect because a thrill is a palpable vibration, meaning it is felt by touch (palpation), not heard through a stethoscope (auscultation).
Option D: This statement is incorrect. The diaphragm is optimized for high-pitched sounds. The bell is the part used for low-pitched sounds.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Function and use of stethoscope bell and diaphragm as background academic context rather than a clinical decision trigger.
Accurate patient assessment depends on using the correct part of the stethoscope. Using the diaphragm when a low-pitched sound needs to be heard (or vice versa) can lead to missed clinical findings, such as a heart murmur or bruit, potentially delaying diagnosis and treatment.
Auscultation is a fundamental nursing skill. Knowing when to switch between the bell and diaphragm is crucial for a comprehensive physical examination.
What if? If a nurse suspects a carotid bruit (a low-pitched sound indicating turbulent blood flow in the carotid artery), they must use the bell of the stethoscope applied lightly over the artery. Using the diaphragm with firm pressure would compress the artery and obscure this critical finding.

How to Approach the Question

First, identify the core subject of the question: the function of a stethoscope's bell and diaphragm.
Recall the basic principles of auscultation. The stethoscope has two sides for different sound frequencies.
Associate the diaphragm (larger, flat surface) with high-frequency sounds. Think of it as a 'D' for 'Default' use, like normal lung and heart sounds.
Associate the bell (smaller, cup-shaped surface) with low-frequency sounds. Think of 'B' for 'Below' normal or 'Bruits'.
Evaluate each option against this knowledge. Option A is wrong because the bell is for low pitch. Option D is wrong because the diaphragm is for high pitch.
Analyze Option C. Remember that a 'thrill' is a tactile (touch) sensation, not an auditory one. Therefore, it cannot be 'detected' by a stethoscope. This makes Option C incorrect.

Concept Tested & Keywords

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E6 Nursing Fundamentals Potter Perry 12e Part 3 pp. 18-20, 65-67, 98-100

Practise the full IGNOU PB Bsc Nsg.Entrance-2026

Attempt every question from this paper in a timed mock, then review the full solution for each one.