Atomic Structure — Chemistry MCQs (Class 11)
Free chapter-wise Chemistry MCQs with answers for MDCAT, FSc and entry tests.
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#41 Uncertainty principle is associated with:
A) Heisenberg
B) Bohr
C) Schrödinger
D) Planck
#42 Nucleons are:
A) Protons and electrons
B) Protons and neutrons
C) Neutrons and electrons
D) Alpha and beta
#43 Which particle is electrically neutral?
A) Proton
B) Electron
C) Neutron
D) Positron
#44 Line spectrum of hydrogen indicates:
A) Continuous energy levels
B) Quantized energy levels
C) Random orbits
D) Infinite energies
#45 Rydberg constant is used to calculate:
A) Atomic mass
B) Wavelengths of hydrogen lines
C) Ion size
D) Lattice energy
#46 When an electron falls to a lower energy level, it:
A) Absorbs a photon
B) Emits a photon
C) Becomes stationary
D) Increases potential energy
#47 A node in an orbital is a region of:
A) Maximum mass
B) Zero probability density
C) Maximum charge
D) Infinite speed
#48 Number of radial nodes in an orbital equals:
A) n + l
B) n - l - 1
C) 2l + 1
D) n - 1
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