Quantum Mechanics

JKPSC Assistant Professor (Physics) · Physics · 60 practice questions with answers and explanations: 9 Easy, 51 Medium, 0 Hard.

Sample questions

Sample Easy question 1

De Broglie's wavelength of a particle of momentum p is:

  1. hp
  2. hc/p
  3. p/h
  4. h/p
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Answer: D. Matter shows wave behaviour.

Sample Easy question 2

The photoelectric effect was explained by:

  1. Schrödinger
  2. Einstein
  3. Bohr
  4. Rutherford
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Answer: B. Using the photon picture, in 1905.

Sample Easy question 3

The Pauli exclusion principle applies to:

  1. Gravitons
  2. Fermions
  3. Bosons
  4. Photons
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Answer: B. Particles with half-integer spin.

Sample Medium question 4

The uncertainty principle can be written as:

  1. Δx Δp ≥ h
  2. Δx Δp = 0
  3. Δx + Δp ≥ ħ
  4. Δx Δp ≥ ħ/2
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Answer: D. It is a limit on simultaneous precision.

Sample Medium question 5

Eigenvalues of Hermitian operators are always:

  1. Real
  2. Zero
  3. Complex
  4. Imaginary
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Answer: A. They correspond to measurable quantities.

Sample Medium question 6

The degeneracy of the n-th energy level of the hydrogen atom (ignoring spin) is:

  1. n²
  2. n
  3. 2n
  4. 2n²
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Answer: A. With spin it is 2n².

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