Question 58

In this question, there are two statements labelled as Assertive (A) and Reason (R).
Assertion (A): An electric bulb makes a ‘bangʼ when it is broken.
Reason (R): The air inside the bulb rushes out immediately on breaking.

Solution

The Assertion (A) is correct because a broken electric bulb does produce a "bang" sound, but the Reason (R) is incorrect; the "bang" occurs due to air rushing into the vacuum, not out of the bulb, as electric bulbs are typically either evacuated or filled with inert gases.

Assertion (A): A broken electric bulb produces a 'bang' sound. This statement is accurate. When the glass of an electric bulb shatters, the sudden collapse of the vacuum generates a brief, sharp noise.

Reason (R): The air within the bulb immediately escapes once it breaks. This statement is inaccurate. Electric bulbs are either evacuated (creating a near vacuum) or filled with inert gases, such as argon or nitrogen, to stop the filament from oxidizing. When the bulb shatters, the higher pressure external air rushes in to occupy the void, rather than air escaping from it.

Consequently, the appropriate conclusion is that Assertion (A) is true while Reason (R) is false.

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