Question 1 of 10
What is the primary function of a photosensor?
Photosensors change their electrical characteristics in response to light.
Question 2 of 10
What type of material is a photoresistor typically made of?
Photoresistors use photoconductive materials, which are semiconductors.
Question 3 of 10
How does the resistance of a photoresistor change with increasing light intensity?
The resistance of a photoresistor decreases as light intensity increases.
Question 4 of 10
What is the primary function of the base terminal (if present) in a phototransistor?
The base can be used to control the transistor's function.
Question 5 of 10
Which of the following is NOT a characteristic of a photoresistor?
Photoresistors have a slower response time compared to phototransistors.
Question 6 of 10
What is the operating principle of a phototransistor?
Phototransistors use the photovoltaic effect to generate a base current from light.
Question 7 of 10
Which component amplifies current in a phototransistor?
The collector current in a phototransistor is amplified.
Question 8 of 10
What type of current can phototransistors conduct?
Phototransistors are unidirectional, conducting only DC current.
Question 9 of 10
What is 'dark current' in a phototransistor?
Dark current is leakage current in the absence of light.
Question 10 of 10
Which of these is a key difference between photoresistors and phototransistors regarding their use in a circuit?
Photoresistors are bidirectional while phototransistors are unidirectional.
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