Atoms and Nuclei Practice Questions
NEET · Physics · 1501 free MCQs with instant results and detailed explanations.
1501
Total
330
Easy
667
Medium
504
Hard
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Topics in Atoms and Nuclei
Mass Defect
228
Radioactivity
238
Bohr Model
267
Binding Energy
253
Nuclear Fission and Fusion
267
Hydrogen Spectrum
248
Sample Questions from Atoms and Nuclei
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
What does the Bohr model of the atom primarily describe?
A.
The motion of electrons in fixed orbits
B.
The random motion of electrons
C.
Electrons reside in clouds around the nucleus
D.
Electrons are located only in the nucleus
Show Answer & Explanation
Correct Answer: A
The Bohr model specifically describes electrons moving in fixed orbits around the nucleus, which is a fundamental concept of the model.
Q2
Easy
In the Bohr model, which of the following is true about the angular momentum of the electron?
A.
It is quantized
B.
It is continuous
C.
It is zero
D.
It decreases with energy
Show Answer & Explanation
Correct Answer: A
According to the Bohr model, the angular momentum of an electron in its orbit is quantized and is given by the formula L = nħ, where n is an integer.
Q3
Easy
Which spectral series is associated with transitions of electrons in hydrogen from higher energy levels to n=2?
A.
Lyman series
B.
Balmer series
C.
Paschen series
D.
Brackett series
Show Answer & Explanation
Correct Answer: B
The Balmer series involves transitions of electrons to n=2, resulting in visible light emissions from hydrogen.
Q4
Medium
In the Bohr model of the hydrogen atom, what is the energy of the electron in the nth orbit?
A.
-13.6/n^2 eV
B.
13.6/n^2 eV
C.
-27.2/n^2 eV
D.
27.2/n^2 eV
Show Answer & Explanation
Correct Answer: A
The energy of the electron in the nth orbit of hydrogen is given by the formula -13.6/n^2 eV, where n is the principal quantum number.
Q5
Medium
According to the Bohr model, which of the following is true for an electron moving in an orbit?
A.
It radiates energy continuously.
B.
It moves in elliptical orbits.
C.
It does not radiate energy.
D.
It can exist in any energy state.
Show Answer & Explanation
Correct Answer: C
In the Bohr model, electrons move in fixed orbits without radiating energy, which is a key postulate of the model.
Q6
Medium
If the radius of the first orbit in a hydrogen atom is 0.53 Å, what is the radius of the second orbit?
A.
0.53 Å
B.
2.12 Å
C.
0.26 Å
D.
1.06 Å
Show Answer & Explanation
Correct Answer: B
The radius of the nth orbit in Bohr's model is given by r_n = n^2 * 0.53 Å. For n = 2, r_2 = 2^2 * 0.53 = 2.12 Å.
Q7
Medium
Which transition in a hydrogen atom will emit the photon with the highest energy?
A.
n=3 to n=2
B.
n=4 to n=1
C.
n=5 to n=3
D.
n=2 to n=1
Show Answer & Explanation
Correct Answer: B
The energy of the emitted photon is greatest when the transition is from a higher state to the lowest state (n=1), thus n=4 to n=1 has maximum energy.
Q8
Hard
In the Bohr model of the hydrogen atom, what is the expression for the radius of the nth orbit?
A.
r_n = 0.529 n^2
B.
r_n = 0.529/n^2
C.
r_n = 0.529 n
D.
r_n = 0.529 n^3
Show Answer & Explanation
Correct Answer: A
The radius of the nth orbit in the Bohr model is given by r_n = 0.529 n^2 Å. This corresponds to the quantized nature of the electron orbits.
Q9
Hard
According to the Bohr model, the energy of an electron in the nth orbit is given by which formula?
A.
E_n = -13.6/n^2 eV
B.
E_n = 13.6/n^2 eV
C.
E_n = -13.6 n^2 eV
D.
E_n = 13.6 n^2 eV
Show Answer & Explanation
Correct Answer: A
The energy of an electron in the nth orbit according to Bohr's model is E_n = -13.6/n^2 eV, which signifies that the energy is negative and is quantized depending on n.
Q10
Hard
What is the wavelength of the light emitted when an electron transitions from the n=3 to n=2 energy level in a hydrogen atom?
A.
656 nm
B.
486 nm
C.
434 nm
D.
410 nm
Show Answer & Explanation
Correct Answer: B
When an electron transitions from n=3 to n=2, the emitted wavelength corresponds to the Balmer series, specifically at 486 nm, based on the Rydberg formula.
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Atoms and Nuclei — NEET Physics Practice Questions Online
This page contains 1501 practice MCQs for the chapter Atoms and Nuclei in NEET Physics. The questions are organized by difficulty — 330 easy, 667 medium, 504 hard — so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 6 topics, giving you comprehensive coverage of the entire chapter.