Practice Test Section
Simulate real exam conditions:
- Set timer before starting
- No formula sheets (except given constants)
- Complete all questions before checking answers
- Analyze mistakes - why did you get it wrong?
The goal is not just solving. It's identifying weak areas.
Easy Level (CBSE Boards)
Time Limit: 20 minutes | Target: 8/10 correct
Q1. Define photoelectric effect. (1 mark)
Q2. The threshold wavelength for a metal is 500 nm. Calculate its work function. (2 marks)
Q3. Light of frequency 6×10¹⁴ Hz falls on a metal of work function 2 eV. Calculate maximum kinetic energy of photoelectrons. (h = 4.14×10⁻¹⁵ eV·s) (2 marks)
Q4. State Einstein's photoelectric equation and explain each term. (3 marks)
Q5. An electron is accelerated through 100V. Calculate its de Broglie wavelength. (2 marks)
Moderate Level (NEET / JEE Main)
Time Limit: 30 minutes | Target: 7/10 correct
Q1. In photoelectric effect, if intensity is doubled keeping frequency constant, which of the following changes?
(a) Stopping potential (b) Saturation current (c) Work function (d) Maximum KE
Q2. Electron and proton have same kinetic energy. Their de Broglie wavelengths are in ratio:
(a) 1:1 (b) 1:43 (c) 43:1 (d) 1836:1
Q3. Light of wavelength 400nm falls on sodium (φ = 2.75eV). Find stopping potential.
(a) 0.35V (b) 0.52V (c) 1.2V (d) 2.75V
Q4. Which phenomenon proves particle nature of light?
(a) Interference (b) Diffraction (c) Photoelectric effect (d) Polarization
Q5. A 100W light source emits photons of energy 2eV. Number of photons emitted per second is:
(a) 3.1×10²⁰ (b) 6.2×10²⁰ (c) 3.1×10¹⁹ (d) 6.2×10¹⁹
Advanced Level (JEE Advanced)
Time Limit: 45 minutes | Target: 5/8 correct
Q1. A point source of 40W emits monochromatic UV light (λ=250nm) uniformly. At 2m distance, a photoelectric detector of area 2cm² and work function 2eV is placed. If quantum efficiency is 1%, find photoelectric current.
Q2. In a V₀ vs ν graph, two metals A and B have lines with slopes s₁ and s₂, and y-intercepts c₁ and c₂. Which is true?
(a) s₁ = s₂, c₁ ≠ c₂ (b) s₁ ≠ s₂, c₁ = c₂ (c) s₁ ≠ s₂, c₁ ≠ c₂ (d) s₁ = s₂, c₁ = c₂
Q3. Electron and photon have same de Broglie wavelength λ. If E_e and E_γ are their energies, which is correct?
(a) E_e = E_γ (b) E_e > E_γ (c) E_e < E_γ (d) Cannot determine