Bohr Model NEET Questions

Physics - Atoms and Nuclei

Bohr Model MCQ Questions


1.
Which of the following is Bohr's first postulate regarding the hydrogen atom?
A.
An electron can occupy any orbit around the nucleus
B.
Electrons exist as standing waves at all times
C.
An electron radiates energy continuously while revolving
D.
An electron in an atom revolves in certain stable orbits without emission of radiant energy
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ANSWER :
D. An electron in an atom revolves in certain stable orbits without emission of radiant energy
2.
According to Bohr's second postulate, the angular momentum of the electron is:
A.
An integral multiple of h/2Ï€
B.
Continuously variable
C.
An integral multiple of h/Ï€
D.
An integral multiple of h
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ANSWER :
A. An integral multiple of h/2Ï€
3.
According to Bohr's third postulate, when an electron jumps from a higher to a lower orbit:
A.
A photon is emitted with energy equal to the difference in energy of the two states
B.
A photon is absorbed by the atom
C.
The electron loses mass
D.
No energy change occurs
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ANSWER :
A. A photon is emitted with energy equal to the difference in energy of the two states
4.
Bohr's quantization condition for angular momentum is mathematically written as:
A.
L = nh²/2π, where n = 1, 2, 3, ...
B.
L = (n+1)h/2Ï€, where n = 0, 1, 2, ...
C.
L = nh/2Ï€, where n = 1, 2, 3, ...
D.
L = nh, where n = 1, 2, 3, ...
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ANSWER :
C. L = nh/2Ï€, where n = 1, 2, 3, ...
5.
The frequency of the photon emitted when an atom makes a transition from energy level E_i to E_f (E_i > E_f) is:
A.
ν = h/(E_i − E_f)
B.
ν = (E_f − E_i)/h
C.
ν = (E_i + E_f)/h
D.
ν = (E_i − E_f)/h
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ANSWER :
D. ν = (E_i − E_f)/h
6.
The total energy of an electron in the nth orbit of a hydrogen atom is:
A.
E_n = +13.6/n² eV
B.
E_n = −13.6 × n² eV
C.
E_n = −13.6/n² eV
D.
E_n = −13.6/n eV
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ANSWER :
C. E_n = −13.6/n² eV