## Photon/Photoelectric effect MCQ Basic Level

Physics is an important subject in preparation for various Competitive exams.To keep a track of your preparation we have designed a small quiz of 10 Basic Level Questions on Photon/Photoelectric effect. You have 10 minutes to solve the quiz, click the start timer button in order to start the timer and then click on submit button at the end to submit the quiz and view your scores and correct answers.

Q1. According to Einstein's photoelectric equation, the plot of the kinetic energy of the emitted photo electrons from a metal Vs the frequency, of the incident radiation gives a straight line whose slope

•   Depends on the nature of the metal used
•   Depends on the intensity of the radiation
•  Depends both on the intensity of the radiation and the metal used
•  Is the same for all metals and independent of the intensity of the radiation

Is the same for all metals and independent of the intensity of the radiation

Q2. The energy of incident photons corresponding to maximum wavelength of visible light is

•  3.2 eV
•  7 eV
•  1.55 eV
•  1 eV

1.55 eV

Q3. If the work function of potassium is 2eV, then its photoelectric threshold wavelength is

•  310 nm
•  620 nm
•  6200 nm
•  3100 nm

620 nm

Q4. The dual nature of light is exhibited by

•  Diffraction and photoelectric effect
•   Diffraction and reflection
•  Refraction and interference
•  Photo electric effect

Diffraction and photoelectric effect

Q5. A photon of energy 4 eV is incident on a metal surface whose work function is 2 eV. The minimum reverse potential to be applied for stopping the emission of electrons is

•  2 V
•  4V
•   6V
•  8V

2 V

Q6. Consider the two following statements A and B and identify the correct choice given in the answers (A) In photovoltaic cells the photoelectric current produced is not proportional to the intensity of incident light. (B) In gas filled photoemissive cells the velocity of photoelectrons depends on the wavelength of the incident radiation

•   Both A and B are true
•  Both A and B are false
•  A is true but B is false
•  A is false B is true

A is false B is true

Q7. In photoelectric emission the number of electrons ejected per second

•   Is proportional to the intensity of light
•  Is proportional to the wavelength of light
•  Is proportional to the frequency of light
•  Is proportional to the work function of metal

Is proportional to the intensity of light

Q8. When ultraviolet rays are incident on metal plate, then photoelectric effect does not occurs. It occurs by the incidence of

•  X-rays
•  Infrared rays
•  Green house effect

X-rays

Q9. Which of the following statements is correct

•  The stopping potential increases with increasing intensity of incident light
•  The photocurrent increases with increasing intensity of light
•  The photocurrent is proportional to applied voltage
•  The current in a photocell increases with increasing frequency of light

The photocurrent increases with increasing intensity of light

Q10. A caesium photocell with a steady potential difference of 60 V across is illuminated by a bright point source of light 50 cm away. When the same light is placed 1 m away the photoelectrons emitted from the cell

•   Are one quarter as numerous
•  Are half as numerous
•  Each carry one quarter of their previous momentum
•  Each carry one quarter of their previous energy

Are one quarter as numerous

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Photon/Photoelectric effect MCQ Basic Level