# Photoelectric Effect MCQs with Answers

## Photoelectric Effect – Definition

A process in which any metal emits electrons due to the light is called photoelectric effect. Photo emission cell, Photo junction diode and Photo voltaic cell works on the principle of photoelectric effect. Threshold frequency used to start the emission of electrons from any metal. The emitted electrons are called photons. All the Photoelectric Effect MCQs with Answers are published according to the new study syllabus for academic year 2021-22.

The aim is to provide MCQs on Photoelectric Effect Multiple Choice questions and answers to understand the concepts of Electricity. If you are willing to learn the concepts of Basic Electronics MCQs multiple choice questions with answer then read all the questions and answers. You will be surely able to qualify for all kinds of Quiz / tests / Interviews after understanding the Introduction to Photoelectric Effect. If you are a students, technician or teacher then you can learn the basic concept of Photoelectric Effect applications, principle and function.

### MCQs on Photoelectric Effect (Questions and Answers)

Q1. Which device works on the principle of photoelectric effect ?

1. Photo emission cell
2. Photo junction diode
3. Photo voltaic cell
4. All are correct

Q2. The emission of electrons from any matter due to light is called photo electric effect.                                                                                                                                                              True / False

Q3. _______ frequency of light used to start emission of electrons from any metal.

1. Medium
2. Low
3. Threshold

Q4. The ejected electrons from any metal due to the light is called Photo-electrons.         True / False

Q5. How many laws of Photoelectric emission ?

1. 3
2. 2
3. 4
4. 1

Q6. The photo electric effect was discovered by German Physicist Heinrich Rudolf Hertz in 1887.                                                                                                                                                             True / False

Q7. The maximum ________ energy of emitted electrons is linear to the frequency of light flux.

1. potential
2. kinetic
3. elastic

Q8. According to the first law of photo electric effect, the number of electrons emitted from a photosensitive surface is directly proportional to the quantity of light flux.               True / False

Q9. The energy of photons is ________ proportional to its frequency.

1. directly
2. indirectly

Q10. The value of planck’s constant is equal to 6.626 × 10−34 joule second.      True / False

Read More: MCQs on Semiconductor Diode Rectifier

Q11. The photon has no _______.

1. electric charge
2. momentum
3. mass
4. all are correct

Q12. The photo electric emission was discovered by British Scientist Joseph J-Thomas in 1897.                                                                                                                                                            True / False

Q13. The most suitable metal for photoelectric emission have ________ work function.

1. low
2. high
3. medium
4. all are correct

Q14. According to the theory of Planck’s light is a type of energy that includes small packets which are called photons.                 True / False

Q15. The work function of cesium metal is ________ electron volt.

1. 7
2. 1
3. 1.9
4. 2.7

Q16. The work function of copper is 4.3 electron volt.                True / False

Q17. The symbol of threshold frequency is ________.

1. F0
2. FTH
3. FVO
4. FIR

Q18. Galvanometer is used to measure very low value of current & voltage.                True / False