Physics-(general)
NEET Physics (general) MCQ Question
Type: MCQ-conceptual-Medium-Class 12
Which of the following statements about semiconductor devices and vacuum tubes is correct?
A
Semiconductor devices do not require a vacuum for electron flow, unlike vacuum tubes.
B
Vacuum tubes are more energy-efficient than semiconductor devices.
C
Both semiconductor devices and vacuum tubes utilize heated cathodes to generate electrons.
D
Semiconductor devices operate at higher voltages compared to vacuum tubes.
Correct Answer
Option A
Detailed Explanation
Semiconductor devices allow for the flow of charge carriers within the solid itself, without needing a vacuum, as stated in the NCERT context. In contrast, vacuum tubes require a vacuum to prevent collisions with air molecules.
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