# MCQs on Photoelectric Effect For NEET

NEET  Physics is the scoring paper in the medical entrance examination. Here, you will discover the NEET Physics MCQ Questions for all Concepts as per the latest syllabus. Practice more on a regular basis with these NEET Physics objective questions on air pollution and improve your subject knowledge & problem-solving skills along with time management. NEET Physics Photoelectric Effect Multiple Choice Questions make you feel confident in answering the question in the exam & increases your scores to high.

## MCQ on Photoelectric Effect

1. Photoelectric effect was explained by
(a) Einstein
(c) Plank
(d) Hertz

2. 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) 2 V
(b) Less than 2 V
(c) Zero
(d) Greater than 2 V

Answer: (d) Greater than 2 V

3. 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

4. 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

5. 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

Answer: (a) Frequency of incident light and nature of the cathode material

6. 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

7. 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

8. 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

Answer: (a) 2.1 x 10-19 J

9. 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