Photoelectric Effect NEET Questions

Physics - Dual Nature of Matter and Radiation

Photoelectric Effect MCQ Questions


13.
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
14.
The kinetic energy of photoelectrons depends on:
A.
Frequency of incident light
B.
Both intensity and frequency
C.
Neither intensity nor frequency
D.
Intensity of incident light
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ANSWER :
A. Frequency of incident light
15.
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
16.
The number of photoelectrons emitted per second depends on:
A.
Wavelength of radiation only
B.
Intensity of incident radiation
C.
Work function only
D.
Frequency of incident radiation
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ANSWER :
B. Intensity of incident radiation
17.
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
18.
If the frequency of incident light is less than the threshold frequency, then:
A.
Photoelectrons are emitted with high energy
B.
Photoelectrons are emitted with low energy
C.
No photoelectrons are emitted
D.
Photoelectrons are emitted slowly
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ANSWER :
C. No photoelectrons are emitted