GRE Subject 2026 Practice Test Physics Quantum Mechanics Free Quiz 1

1. What does quantum mechanics deal with?

A. Atomic and subatomic scale B. Large scale motion C. Electricity and magnetism D. Heat and temperature

2. What is the energy of a photon?

A. E = mc² B. E = ½mv² C. E = kq₁q₂/r D. E = hf = hc/λ

3. What is the Heisenberg uncertainty principle?

A. Δx Δp ≥ h/4π B. ΔE Δt ≥ h/4π C. Δx Δp ≥ h D. Δx Δp = 0

4. What is the fundamental equation of quantum mechanics?

A. Newton's equation B. Maxwell's equation C. Schrödinger equation D. Einstein's equation

5. What describes the state of a quantum system?

A. Probability B. Energy C. Momentum D. Wave function

6. What does |Ψ|² give?

A. Energy density B. Probability density C. Momentum density D. Charge density

7. What are the energy levels of the hydrogen atom?

A. -13.6/n eV B. -13.6 n² eV C. -13.6/n eV D. -13.6/n² eV

8. What is the Bohr radius?

A. 5.29 × 10⁻¹⁰ m B. 0.529 × 10⁻¹⁰ m C. 0.529 × 10⁻¹² m D. 5.29 × 10⁻¹² m

9. What is the principal quantum number?

A. n B. l C. m_l D. m_s

10. What is the angular momentum quantum number?

A. n B. m_l C. l D. m_s