Atoms and Nuclei PYQs - Last 5 Years

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Practice 28 NEET Physics questions from Atoms and Nuclei. Use the year-wise and type-wise breakdown to prioritize recent PYQs, then continue into the question list below.

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Last 5 Years Atoms and Nuclei Questions

Showing 28 of 28 filtered questions.

1Atoms And Nuclei

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?

2Atoms And Nuclei

Consider the following nuclear reaction
\({ }^{238} \mathrm{U} \longrightarrow{ }^{234} \mathrm{Th}+{ }^4 \mathrm{He}\)
Take masses of ${ }^{238} \mathrm{U},{ }^{234} \mathrm{Th}$ and ${ }^4 \mathrm{He}$ as $238.050 \mathrm{u}, 234.043 \m...

3Atoms And Nuclei

Consider that an electron is revolving in an excited state of Hydrogen atom with velocity $\sqrt{25.6} \times 10^5 \mathrm{~ms}^{-1}$. The radius of the orbit is $x \times 10^{-9} \mathrm{~m}$. The value of $x$ is:
[Take the mass of electro...

4Atoms And Nuclei

An unknown nucleus has a nuclear density of $2.29 \times 10^{17} \mathrm{~kg} / \mathrm{m}^3$ and mass of $19.926 \times 10^{-27} \mathrm{~kg}$. Its mass number $A$ is approximately:
(Take $R_0=1.2 \times 10^{-15} \mathrm{~m}, 4 \pi=12.56$ ...

5Atoms And Nuclei

Four statements are given ( $A$ is mass number):
A. The volume of a nucleus is proportional to $A^{1 / 3}$.
B. The volume of a nucleus is proportional to $A$.
C. The difference in mass of an atom and its nucleus is called the mass defect.
D...

6Atoms And Nuclei

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 \mathrm{eV}=1.6 \times 10^{-19} \mathrm{~J}, \mathrm{...

7Atoms And Nuclei

A particle of mass $m$ is moving around the origin with a constant force $F$ pulling it towards the origin. If Bohr model is used to describe its motion, the radius of the $n^{\text {th }}$ orbit and the particle's speed $v$ in the orbit de...

8Atoms And Nuclei

Some energy levels of a molecule are shown in the figure with their wavelengths of transitions. Then :

9Atoms And Nuclei

Select the correct statements among the following :
A. Slow neutrons can cause fission in \({ }_{92}^{235} \mathrm{U}\) than fast neutrons.
B. \(\alpha\)-rays are Helium nuclei.
C. \(\beta\)-rays are fast moving electrons or positrons.
D. $...

10Atoms And Nuclei

Water is used as a coolant in a nuclear reactor because of its

11Atoms And Nuclei

The spectral series which corresponds to the electronic transition from the levels \(n_2=5,6, \ldots\) to the level \(n_1=4\) is

12Atoms And Nuclei

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 o...

13Atoms And Nuclei

\({ }_{82}^{290} X \xrightarrow{\alpha} Y \xrightarrow{e^{+}} Z \xrightarrow{\beta^{-}} P \xrightarrow{e^{-}} Q\)
In the nuclear emission stated above, the mass number and atomic number of the product \(Q\) respectively, are

14Atoms And Nuclei

Match List I with List II:

.tg {border-collapse:collapse;border-spacing:0;}
.tg td{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px;
overflow:hidden;padding:10px 5px;word-break:normal;}...

15Atoms And Nuclei

The angular momentum of an electron moving in an orbit of hydrogen atom is \(\mathrm{1.5\left(\frac{h}{\pi}\right)}\). The energy in the same orbit is nearly.

16Atoms And Nuclei

The wavelength of Lyman series of hydrogen atom appears in:

17Atoms And Nuclei

The ground state energy of hydrogen atom is \(-13.6 ~\mathrm{eV}\). The energy needed to ionize hydrogen atom from its second excited state will be :

18Atoms And Nuclei

The radius of inner most orbit of hydrogen atom is \(5.3 \times 10^{-11} \mathrm{~m}\). What is the radius of third allowed orbit of hydrogen atom?

19Atoms And Nuclei

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

20Atoms And Nuclei

The half life of a radioactive substance is 20 minutes. In how much time, the activity of substance drops to \(\left(\frac{1}{16}\right)^{\text {th }}\) of its initial value?

21Atoms And Nuclei

The ratio of Coulomb's electrostatic force to the gravitational force between an electron and a proton separated by some distance is 2.4 \(\times\) 1039. The ratio of the proportionality constant, \(K = {1 \over {4\pi {\varepsilon _0}}}\) t...

22Atoms And Nuclei

At any instant, two elements X1 and X2 have same number of radioactive atoms. If the decay constant of X1 and X2 are 10 \(\lambda\) and \(\lambda\) respectively, then the time when the ratio of their atoms becomes \({1 \over e}\) respective...

23Atoms And Nuclei

Given below are two statements
Statement I : The law of radioactive decay states that the number of nuclei undergoing the decay per unit time is inversely proportional to the total number of nuclei in the sample.
Statement II : The half of ...

24Atoms And Nuclei

Let R1 be the radius of the second stationary orbit and R2 be the radius of the fourth stationary orbit of an electron in Bohr's model. The ratio \({{{R_1}} \over {{R_2}}}\) is :

25Atoms And Nuclei

A nucleus of mass number 189 splits into two nuclei having mass number 125 and 64. The ratio of radius of two daughter nuclei respectively is

26Atoms And Nuclei

Let T1 and T2 be the energy of an electron in the first and second excited states of hydrogen atoms, respectively. According to the Bohr's model of an atom, the ratio T1 : T2 is

27Atoms And Nuclei

In the given nuclear reaction, the element X is
\({}_{11}^{22}Na \to X + {e^ + } + v\)

28Atoms And Nuclei

The graph which shows the variation of the de Broglie wavelength (\(\lambda\)) of a particle and its associated momentum (p) is