Discussion
Assertion (A): Assertion: A superheterodyne receiver's selectivity is unaffected by the station tuned.
Reason (R): Reason: Its preselector is broad enough to pass any station without attenuation.
Select the correct answer from the options below.
Answer: D
The assertion is true but the reason is wrong: selectivity is uniform because the intermediate frequency filter works at a fixed frequency, not because the preselector is broad. The preselector's breadth is a limitation it happens to have, and its actual job is image rejection. A true conclusion supported by the wrong mechanism is the most instructive kind of error, because it survives every check except tracing the cause.
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