Photoelectric Effect NEET Questions

Physics - Dual Nature of Matter and Radiation

Photoelectric Effect MCQ Questions


7.
In the photoelectric effect apparatus, the function of the commutator is to:
A.
Convert AC to DC
B.
Reverse the polarity of the emitter and collector plates
C.
Measure the photocurrent
D.
Filter out unwanted frequencies
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ANSWER :
B. Reverse the polarity of the emitter and collector plates
8.
In a photoelectric setup, the photocurrent is measured by:
A.
A galvanometer for high currents
B.
A microammeter
C.
An electroscope
D.
A voltmeter
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ANSWER :
B. A microammeter
9.
The intensity of light in a photoelectric experiment is varied by:
A.
Changing the distance between the source and the emitter
B.
Using different colored filters
C.
Heating the source
D.
Changing the applied voltage
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ANSWER :
A. Changing the distance between the source and the emitter
10.
For a given photosensitive material, photocurrent varies with intensity of incident light (above threshold frequency) as:
A.
Inversely proportional
B.
Quadratically proportional
C.
Linearly proportional
D.
Independent of intensity
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ANSWER :
C. Linearly proportional
11.
The number of photoelectrons emitted per second is proportional to:
A.
Intensity of incident light
B.
Square root of intensity
C.
Frequency of incident light
D.
Wavelength of incident light
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ANSWER :
A. Intensity of incident light
12.
The saturation current in a photoelectric experiment is reached when:
A.
Frequency equals threshold frequency
B.
Anode potential equals cathode potential
C.
All photoelectrons emitted by the cathode reach the anode
D.
Light intensity is maximum
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ANSWER :
C. All photoelectrons emitted by the cathode reach the anode