MCQ 121
Which of the following describes the wave function in quantum mechanics?
A) It provides the exact position of an electron.
B) It gives the probability of finding an electron in a certain region.
C) It determines the mass of an electron.
D) It describes the speed of an electron.
Answer: B) It gives the probability of finding an electron in a certain region.
Explanation: The wave function, often represented as Ψ, provides the probability density of finding an electron in a specific region of space.
MCQ 122
Which of the following particles is not considered a fermion?
A) Electron
B) Proton
C) Photon
D) Neutron
Answer: C) Photon.
Explanation: Photons are bosons, not fermions, as they do not obey the Pauli Exclusion Principle.
MCQ 123
What is the primary difference between classical mechanics and quantum mechanics?
A) Classical mechanics deals with macroscopic objects, while quantum mechanics deals with microscopic particles.
B) Classical mechanics does not include wave-particle duality.
C) Quantum mechanics cannot explain everyday phenomena.
D) All of the above.
Answer: D) All of the above.
Explanation: Classical mechanics applies to macroscopic objects, while quantum mechanics addresses the behavior of microscopic particles, including wave-particle duality.
MCQ 124
What is the significance of the principal quantum number (n)?
A) It defines the shape of the orbital.
B) It indicates the size and energy level of the orbital.
C) It describes the orientation of the orbital.
D) It identifies the spin direction of an electron.
Answer: B) It indicates the size and energy level of the orbital.
Explanation: The principal quantum number (n) represents the main energy level and size of the orbital, with higher values indicating greater energy and distance from the nucleus.
MCQ 125
Which of the following quantum numbers can have negative values?
A) Principal quantum number (n)
B) Azimuthal quantum number (l)
C) Magnetic quantum number (mₗ)
D) Spin quantum number (s)
Answer: C) Magnetic quantum number (mₗ).
MCQ 126
What is the relationship between frequency and wavelength?
A) Directly proportional
B) Inversely proportional
C) Independent
D) None of the above
Answer: B) Inversely proportional.
Explanation: Frequency and wavelength are inversely related; as the frequency increases, the wavelength decreases, according to the formula
c=λν.
MCQ 127
Which of the following describes the quantum state of an electron?
A) Position and momentum
B) Only energy level
C) Probability distribution
D) Both A and C
Answer: D) Both A and C.
Explanation: The quantum state of an electron includes both its probability distribution and can describe aspects such as its position and momentum.
MCQ 128
What does the term “quantization” refer to in quantum mechanics?
A) The continuous range of energy levels
B) The existence of discrete energy levels
C) The measurement of energy
D) The wave-like behavior of particles
Answer: B) The existence of discrete energy levels.
Explanation: Quantization refers to the concept that energy levels in an atom are not continuous but exist in discrete amounts.
MCQ 129
In a hydrogen atom, which transition results in the emission of the longest wavelength photon?
A) n=3 to n=2
B) n=2 to n=1
C) n=4 to n=3
D) n=5 to n=4
Answer: D) n=5 to n=4.
Explanation: The transition with the smallest energy difference corresponds to the longest wavelength, which occurs when an electron falls from n=5 to n=4.
MCQ 130
Which of the following is a characteristic of an ionic bond?
A) Formed between nonmetals
B) Involves sharing of electrons
C) Generally has high melting and boiling points
D) Does not conduct electricity in solid state
Answer: C) Generally has high melting and boiling points.
Explanation: Ionic bonds typically result in compounds with high melting and boiling points due to strong electrostatic forces between the ions.
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