Question

Light produced in a screen is _______

(a) disappears immediately

(b) does not disappear at all

(c) is not visible to the eye

(d) disappears slowly

I had been asked this question by my college professor while I was bunking the class.

This key question is from Basic Principle of Signal Display topic in chapter Oscilloscopes of Electrical Measurements

Answer 1

Correct choice is (d) disappears slowly

Easy explanation: When the magnitude of the applied voltage reduces to zero, the light produced on the screen due to the bombardment of electrons does not disappear immediately and reduces in terms of intensity slowly.