Physics-(general)
NEET Physics (general) MCQ Question
Type: MCQ-diagram based-Easy-Class 12
A diagram in the NCERT textbook shows a discharge tube with electrodes at either end. When a high voltage is applied, a glow appears. What does this glow indicate?
A
The ionization of gas molecules.
B
The presence of a vacuum.
C
The generation of X-rays.
D
The creation of new photons.
Correct Answer
Option A
Detailed Explanation
The glow indicates the ionization of gas molecules at low pressure when a high voltage is applied, leading to conduction of electricity and a discharge between electrodes.
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