Multiple choice general knowledge science & technology

When light falls on an LDR, its resistance will:

  1. Increase

  2. Double

  3. Stay the same

  4. Decrease
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

An LDR (Light Dependent Resistor) is a photoconductive cell whose resistance decreases when light intensity increases. When photons strike the semiconductor material, they create electron-hole pairs, increasing conductivity and thus reducing resistance.

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