LDR PRACTICE EXAM 2026 QUESTIONS
AND ANSWERS CERTIFICATION
EVALUATION SET
●● How does light intensity affect the resistance of an LDR?
Answer: When light intensity increases, the resistance of the LDR
decreases, allowing more current to flow through it.
●● What happens to the current flowing through an LDR when light
intensity decreases?
Answer: The resistance increases, reducing the current flowing through
the LDR.
●● What principle do LDRs operate on?
Answer: The principle of photoconductivity, where a material's electrical
conductivity improves when it absorbs light.
●● What materials are LDRs typically made from?
Answer: Semiconductor materials, commonly cadmium sulfide (CdS).
●● What is the function of the photosensitive layer in an LDR?
Answer: It reacts to light and is the core part of the photoresistor.
AND ANSWERS CERTIFICATION
EVALUATION SET
●● How does light intensity affect the resistance of an LDR?
Answer: When light intensity increases, the resistance of the LDR
decreases, allowing more current to flow through it.
●● What happens to the current flowing through an LDR when light
intensity decreases?
Answer: The resistance increases, reducing the current flowing through
the LDR.
●● What principle do LDRs operate on?
Answer: The principle of photoconductivity, where a material's electrical
conductivity improves when it absorbs light.
●● What materials are LDRs typically made from?
Answer: Semiconductor materials, commonly cadmium sulfide (CdS).
●● What is the function of the photosensitive layer in an LDR?
Answer: It reacts to light and is the core part of the photoresistor.
