Unit 4: Quantum Mechanics - Practice Quiz

PHY110 — Engineering Physics 50 Questions
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1 Which experiment historically established the particle nature of light?

A. Photoelectric Effect
B. Interference
C. Diffraction
D. Polarization

2 According to Planck's hypothesis, energy is emitted or absorbed in discrete packets called quanta. The energy of a quantum is given by:

A.
B.
C.
D.

3 In the photoelectric effect, the minimum energy required to remove an electron from the surface of a metal is called:

A. Stopping Potential
B. Kinetic Energy
C. Potential Energy
D. Work Function

4 The Einstein's photoelectric equation is given by (where is maximum kinetic energy, is frequency, and is work function):

A.
B.
C.
D.

5 The de Broglie wavelength associated with a particle of momentum is given by:

A.
B.
C.
D.

6 If the velocity of a particle is doubled, its de Broglie wavelength will:

A. Become half
B. Remain the same
C. Double
D. Become four times

7 The de Broglie wavelength of an electron accelerated through a potential difference of volts is approximately given by:

A.
B.
C.
D.

8 Which of the following bodies will have the shortest de Broglie wavelength if they all move with the same velocity?

A. Proton
B. Electron
C. Neutron
D. Alpha particle

9 The de Broglie wavelength of a gas molecule at absolute temperature is given by:

A.
B.
C.
D.

10 The Heisenberg Uncertainty Principle states that the product of uncertainties in position () and momentum () is always:

A.
B.
C.
D.

11 Why is the wave nature of a moving cricket ball not observed in daily life?

A. Its mass is too large, making negligible
B. Its velocity is too high
C. It is not a charged particle
D. It does not satisfy Planck's law

12 The Heisenberg uncertainty principle explains why:

A. Electrons orbit the nucleus
B. Protons repel each other
C. Light travels at speed c
D. Electrons cannot exist inside the nucleus

13 Another form of Heisenberg's uncertainty principle relates Energy () and Time () as:

A.
B.
C.
D.

14 The velocity with which the envelope of a wave packet moves is called:

A. Group velocity
B. Sound velocity
C. Light velocity
D. Phase velocity

15 The phase velocity () is given by the relation:

A.
B.
C.
D.

16 For a non-relativistic material particle, the relation between group velocity () and particle velocity () is:

A.
B.
C.
D.

17 The phase velocity of matter waves associated with a particle moving with velocity is:

A.
B.
C.
D. Zero

18 In a non-dispersive medium, the relationship between phase velocity () and group velocity () is:

A.
B.
C.
D.

19 The wave function in quantum mechanics represents:

A. The momentum of the particle
B. The exact position of the particle
C. The probability amplitude
D. The energy of the particle

20 The quantity represents:

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

21 For a wave function to be well-behaved, it must be:

A. Finite, continuous, and single-valued
B. Zero everywhere
C. Real and positive
D. Infinite, discontinuous, and multi-valued

22 The normalization condition for a wave function over all space is:

A.
B.
C.
D.

23 The operator for momentum () in one dimension is:

A.
B.
C.
D.

24 The operator for total energy (Hamiltonian ) in the time-independent Schrodinger equation is:

A.
B.
C.
D.

25 Schrodinger's time-independent wave equation in one dimension is:

A.
B.
C.
D.

26 For a particle in a one-dimensional box of length with infinite potential walls, the potential inside the box () is:

A.
B.
C.
D.

27 The wave function for a particle in a 1D box of width is given by (where is an integer):

A.
B.
C.
D.

28 The energy eigenvalues for a particle in a 1D box of length are given by:

A.
B.
C.
D.

29 The lowest possible energy (Zero Point Energy) for a particle in a box corresponds to:

A.
B.
C.
D.

30 Which of the following statements is true for a particle in a box?

A. The particle can exist outside the box
B. The particle can be at rest ()
C. Energy levels are discrete (quantized)
D. Energy levels are continuous

31 The spacing between energy levels for a particle in a box:

A. Decreases as increases
B. Remains constant
C. Varies randomly
D. Increases as increases

32 In the Quantum Tunneling effect, a particle can cross a potential barrier even if:

A. The barrier width is infinite
B.
C. Its Total Energy () is less than the Barrier Height ()
D.

33 The probability of tunneling decreases exponentially with:

A. Decreasing particle mass
B. Increasing particle energy
C. Decreasing barrier width
D. Increasing barrier width and height

34 Which device works on the principle of quantum tunneling?

A. Transformer
B. Laser
C. Scanning Tunneling Microscope (STM)
D. Optical Fiber

35 The phenomenon of Alpha decay in radioactive nuclei is explained by:

A. Compton effect
B. Quantum Tunneling
C. Zeeman effect
D. Photoelectric effect

36 The Compton effect provides experimental evidence for:

A. Uncertainty principle
B. Tunneling effect
C. Particle nature of radiation
D. Wave nature of particles

37 The Davisson-Germer experiment confirmed the:

A. Speed of light
B. Wave nature of electrons
C. Charge of an electron
D. Particle nature of electrons

38 If the size of the box () is doubled, the ground state energy of the particle becomes:

A. Half
B. Double
C. One-fourth
D. Four times

39 In the time-dependent Schrodinger equation , the energy operator corresponds to:

A.
B.
C.
D.

40 A 'node' in a wave function is a point where:

A. Probability is zero
B. Potential energy is zero
C. Probability is maximum
D. Kinetic energy is zero

41 How many nodes (excluding boundaries) does the -th state wave function of a particle in a box have?

A.
B.
C.
D.

42 Two wave functions and are said to be orthogonal if:

A. for
B. They have the same energy
C.
D. for

43 The failure of classical mechanics to explain the spectral distribution of blackbody radiation at short wavelengths is known as:

A. Stark effect
B. Compton shift
C. Infrared catastrophe
D. Ultraviolet catastrophe

44 In the macroscopic limit (large quantum numbers), quantum mechanics results approach classical mechanics results. This is known as:

A. Correspondence Principle
B. Superposition Principle
C. Exclusion Principle
D. Uncertainty Principle

45 The momentum of a photon of frequency is:

A.
B.
C.
D.

46 If the uncertainty in position of a particle is zero, the uncertainty in its momentum is:

A. Finite but small
B. Zero
C. Infinite
D.

47 The stopping potential in a photoelectric experiment depends on:

A. Time of irradiation
B. Frequency of incident light
C. Intensity of incident light
D. Distance of light source

48 Increasing the intensity of incident light in a photoelectric experiment increases:

A. Stopping potential
B. Number of photoelectrons emitted
C. Kinetic energy of electrons
D. Work function

49 Matter waves are:

A. Mechanical waves
B. Electromagnetic waves
C. Transverse waves
D. Probability waves

50 The wavelength of a electron is approximately:

A.
B.
C.
D.