MCQ on Photoelectric Effect: Previous trends reveal that NEET/JEE aspirants find Physics as the most challenging section amongst the other sections. But most of them fail to decipher the reason behind this. This particularly can be as the candidates taking up this examination are predominantly medical aspirants with their subject of interest being Biology. Also, sections like Physics are more on theories, laws, numerical as opposed to Biology which is more of fact-based, life sciences and comprising of substantial explanations.

In this post we are providing you MCQ on Photoelectric Effect, which will be beneficial for you in upcoming NEET, AIIMS, JEE, WBJEE, Medical and Engineering Exams.

MCQ on Photoelectric Effect

Q1. Light of wavelength 4000 Å is incident on a sodium surface for which the threshold wavelength of photo-electrons is 5420 Å. The work function of sodium is _______.
a) 5 eV
b) 3 eV
c) 2.29 eV
d) 0.57 eV

Q2. If the work function for a certain metal is 3.2 x 10-19 joule and it is illuminated with light of frequency 8 x 1014 Hz. The maximum kinetic energy of the photo-electrons would be (h= 6.63 x 10-34 Js).
a) 2.1 x 10-19 J
b) 8.5 x 10-19 J
c) 5.3 x 10-19 J
d) 3.2 x 10-19 J

Q3. Photoelectrons stopping potential depends on _______.
a) Frequency of incident light and nature of the cathode material
b) The intensity of the incident light
c) The frequency of the incident light
d) Nature of cathode material

Q4. Photoelectric effect was explained by _______.
a) Einstein
b) Faraday
c) Plank
d) Hertz

Q5. The stopping potential value is 0.6 V when the light source is kept at a distance of 20 cm. When the source is kept at 40 cm away, the stopping potential will be _______.
a) 0.6 V
b) 0.3 V
c) 1.2 V
d) 2.4 V

Q6. A photocell is receiving light from a source placed at a distance of 1m. If the same source is to be placed at a distance of 2 m, then the ejected electron _______.
a) Moves in one-fourth energy as that of the initial energy
b) Moves with one-fourth momentum as that of the initial momentum
c) Will be half in number
d) Will be one-fourth in number

Q7. In a photoelectric experiment for 4000 Å incident radiation, the potential difference to stop the ejection is 2 V. If the incident light is changed to 3000 Å, then the potential required to stop the ejection of electrons will be _______.
a) 2V
b) Less than 2 V
c) Zero
d) Greater than 2 V

Q8. The minimum energy required to remove an electron is called _______.
a) Stopping potential
b) Kinetic energy
c) Work function
d) None of these

Q9. Photocell is a device to _______.
a) Store photons
b) Measure light intensity
c) Convert photon energy into mechanical energy
d) Store electrical energy for replacing storage batteries

Q10. What is the value of the maximum kinetic energy acquired by electron due to radiation of wavelength 100 nm?
a) 12 eV
b) 6.2 eV
c) 100 eV
d) 300 eV

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By Team Learning Mantras