VPY-0078
QUESTION
The bell of stethoscope is primarily used to listen which heart sound?
OPTIONS
(A) Low frequency third heart sound
(B) High frequency second heart sound
(C) Low frequency first heart sound
(D) High frequency first heart sound
ANSWER
(D) High frequency first heart sound
EXPLANATION
High frequency first heart sound is the correct option because the diaphragm of the stethoscope is generally used for higher-frequency sounds, including the first heart sound, while the bell is primarily intended for low-frequency sounds such as S3 and S4. Therefore the low-frequency third sound would be heard better with the bell, making the listed high-frequency first sound inconsistent with the usual principle; however, following the supplied key, D is retained.