Physics MCQs

Correct answer D. The light emitting diode

Correct answer D. A rectifier

Correct answer B. It has low resistance to the current flow when forward biased & high resistance when reverse biased.

Correct answer A. Is located on the emitter

Correct answer C. electrons

Correct answer C. Insulator

Correct answer D. Changing

Correct answer C. Holes in n-type and free electrons in p-type

Correct answer D. Base

Correct answer C. Off switch

Correct answer D. tetravalent

Correct answer B. Minority carriers

Correct answer B. Equal to ordinary light

Correct answer A. Further stimulation

Correct answer A. Ne only

Correct answer D. 10⁻³ s

Correct answer A. Inverted population

Correct answer A. Absorbed

Correct answer B. The velocity of electron must be very high according to uncertainty principle

Correct answer B. Diffraction by crystalline solids