Free Test Photoelectric effect – NEET

Q1: Who discovered the photoelectric effect?

A. Planck B. Einstein C. Bohr D. Rutherford

Q2: Work function is defined as:

A. Kinetic energy of electron B. Energy to remove an electron C. Binding energy D. Electron rest energy

Q3: The unit of work function is:

A. kg B. Joule C. Volt D. Meter

Q4: Which of the following affects photoelectric current?

A. Intensity of light B. Frequency of light C. Wavelength of light D. Work function

Q5: Which of the following affects the maximum kinetic energy of emitted electrons?

A. Light intensity B. Frequency of light C. Number of photons D. Metal area

Q6: The equation for photoelectric effect is:

A. E = mc² B. E = hf - φ C. E = hf + φ D. E = φ - hf

Q7: Which metal surface is best for observing photoelectric effect?

A. Iron B. Copper C. Sodium D. Gold

Q8: What is the role of a collector plate in photoelectric setup?

A. Emit electrons B. Absorb electrons C. Repel electrons D. Store light

Q9: Stopping potential is used to:

A. Increase current B. Increase voltage C. Stop electrons D. Emit electrons

Q10: Kinetic energy of photoelectrons is zero when:

A. Light is intense B. Frequency = threshold frequency C. Metal is shiny D. Electron is stationary

Q11: If light of frequency less than threshold is used:

A. More electrons are emitted B. No photoelectrons emitted C. Electrons gain energy D. Metal heats up

Q12: Planck’s constant is denoted by:

A. c B. e C. h D. k

Q13: What is photon energy if frequency is 5×10¹⁴ Hz?

A. 3.3×10⁻¹⁹ J B. 6.6×10⁻¹⁹ J C. 1.2×10⁻¹⁹ J D. 8.3×10⁻¹⁹ J

Q14: Photoelectric effect proves:

A. Wave nature of light B. Magnetic nature of light C. Particle nature of light D. Dual nature of light

Q15: Time lag in photoelectric emission is:

A. Several seconds B. A few minutes C. 1 hour D. Zero

Q16: What happens when intensity of incident light is increased?

A. Photon energy increases B. Number of photons increases C. Electron speed increases D. Work function increases

Q17: Threshold wavelength is:

A. Maximum wavelength to emit electrons B. Minimum wavelength to emit electrons C. Wavelength of visible light D. None

Q18: Which of these cannot explain photoelectric effect?

A. Quantum theory B. Photon theory C. Wave theory D. Einstein’s theory

Quiz for Photoelectric effect