NEET Atoms PYQ practice sheet

10 previous-year NEET Physics questions from Atoms, newest papers first. Atoms carries 12 of the Physics questions in NEET 2020 to 2026, so this is a good place to test yourself after revising the chapter. Marking: +4 correct, −1 wrong.

1. 1.

   RE-NEET 2026

   In Geiger-Marsden experiment, the number of scattered $\alpha$-particles $N(\theta)$ is plotted as a function of scattering angle $\theta$. Which of the following options represents the correct plot? Each option plots $N(\theta)$ on a logarithmic vertical axis ($10$ to $10^7$) against $\theta$ from $0$ to $180$ degrees.

   • (A)
     
   • (B)
     
   • (C)
     
   • (D)
     
2. 2.

   RE-NEET 2026

   Consider that an electron is revolving in an excited state of Hydrogen atom with velocity $\sqrt{25.6}\times10^{5}\ \mathrm{ms^{-1}}$. The radius of the orbit is $x \times 10^{-9}$ m. The value of $x$ is: [Take the mass of electron to the $9\times10^{-31}$ kg, charge of electron $= -1.6\times10^{-19}$ C and $\frac{1}{4\pi\varepsilon_0} = 9\times10^{9}\ \mathrm{Nm^2C^{-2}}$]

   • (A)
     $3$
   • (B)
     $4$
   • (C)
     $1$
   • (D)
     $2$
3. 3.

   NEET 2026

   In the first excited state of hydrogen atom, the energy of its electron is $-3.4$ eV. The radial distance of the electron from the hydrogen nucleus in this case is approximately: (Take $1\ \text{eV}=1.6\times10^{-19}$ J, $e=1.6\times10^{-19}$ C and $\dfrac{1}{4\pi\epsilon_0}=9\times10^{9}\ \text{N m}^2/\text{C}^2$)

   • (A)
     $2.1\times10^{-8}$ m
   • (B)
     $2.1\times10^{-9}$ m
   • (C)
     $2.1\times10^{-11}$ m
   • (D)
     $2.1\times10^{-10}$ m
4. 4.

   NEET 2024

   Match the List-I with List-II. List-I (Spectral lines of hydrogen for transitions from): (A) $n_2=3$ to $n_1=2$, (B) $n_2=4$ to $n_1=2$, (C) $n_2=5$ to $n_1=2$, (D) $n_2=6$ to $n_1=2$ List-II (Wavelengths, nm): (I) 410.2, (II) 434.1, (III) 656.3, (IV) 486.1 Choose the correct answer from the options given below:

   • (A)
     A-I, B-II, C-III, D-IV
   • (B)
     A-III, B-IV, C-II, D-I
   • (C)
     A-II, B-I, C-IV, D-III
   • (D)
     A-IV, B-III, C-I, D-II
5. 5.

   NEET 2024

   Given below are two statements: Statement I: Atoms are electrically neutral as they contain equal number of positive and negative charges. Statement II: Atoms of each element are stable and emit their characteristic spectrum. In the light of the above statements, choose the most appropriate answer from the options given below:

   • (A)
     Both Statement I and Statement II are incorrect.
   • (B)
     Statement I is incorrect but Statement II is correct.
   • (C)
     Statement I is correct but Statement II is incorrect.
   • (D)
     Both Statement I and Statement II are correct.
6. 6.

   NEET 2023

   The minimum wavelength of $X$-rays produced by an electron accelerated through a potential difference of $V$ volts is proportional to:

   • (A)
     $V^2$
   • (B)
     $\sqrt V$
   • (C)
     $\dfrac{1}{V}$
   • (D)
     $\dfrac{1}{\sqrt V}$
7. 7.

   NEET 2023

   In hydrogen spectrum, the shortest wavelength in the Balmer series is $\lambda$. The shortest wavelength in the Bracket series is :

   • (A)
     $16\lambda$
   • (B)
     $2\lambda$
   • (C)
     $4\lambda$
   • (D)
     $9\lambda$
8. 8.

   NEET 2023

   The radius of inner most orbit of hydrogen atom is $5.3\times10^{-11}\ \mathrm{m}$. What is the radius of third allowed orbit of hydrogen atom?

   • (A)
     $4.77\ \mathrm{\AA}$
   • (B)
     $0.53\ \mathrm{\AA}$
   • (C)
     $1.06\ \mathrm{\AA}$
   • (D)
     $1.59\ \mathrm{\AA}$
9. 9.

   NEET 2022

   Let $T_1$ and $T_2$ be the energy of an electron in the first and second excited states, respectively, of a hydrogen atom. According to Bohr's model of an atom, the ratio $T_1:T_2$ is:

   • (A)
     9 : 4
   • (B)
     1 : 4
   • (C)
     4 : 1
   • (D)
     4 : 9
10. 10.

    NEET 2020

    For which one of the following, Bohr model is not valid?

    • (A)
      Hydrogen atom
    • (B)
      Singly ionised helium atom ($\mathrm{He^+}$)
    • (C)
      Deuteron atom
    • (D)
      Singly ionised neon atom ($\mathrm{Ne^+}$)