Atoms and Nuclei PYQs - Last 5 Years

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Practice 57 AP EAPCET 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 50 of 57 filtered questions.

1Atoms And Nuclei

If the binding energy per nucleon of deuteron $\left({ }_1 \mathrm{H}^2\right)$ is 1.15 MeV and an $\alpha$-particle has a binding energy of 7.1 MeV per nucleon, then the energy released per nucleon in the given reaction is
$$ { }_1 \mathrm...

2Atoms And Nuclei

The ratio of the shortest wavelengths of Bracket and Balmer series of hydrogen atom is

3Atoms And Nuclei

If the half-life of a radioactive material is 10 years, then the percentage of the material decayed in 30 years is

4Atoms And Nuclei

If the surface areas of two nucleii are in the ratio $9: 47$, then the ratio of their mass number is

5Atoms And Nuclei

The ratio of the time periods of the revolution of the electrons in the second and third excited states of hydrogen atom is

6Atoms And Nuclei

The ratio of energies of photons produced due to transition of an electron in hydrogen atom from second energy level to first energy level and fifth energy level to second energy level is

7Atoms And Nuclei

The half life of a radioactive substance is 10 minutes. If $n_1$ and $n_2$ are the number of atoms decayed in 20 and 30 minutes respectively, then $n_1: n_2=$

8Atoms And Nuclei

The ratio of the orders of the spacings of nuclear energy levels and atomic energy levels is

9Atoms And Nuclei

Of the following, Bohr's atomic model is applicable to

10Atoms And Nuclei

The ratio of the wavelengths of the spectral lines emitted due to transitions $3 \rightarrow 2$ and $2 \rightarrow 1$ orbits in the hydrogen atom is

11Atoms And Nuclei

The density (in $\mathrm{kg} \mathrm{m}^{-3}$ ) of nuclear matter is of the order of

12Atoms And Nuclei

If the time taken for a radioactive substance to decay $8 \%$ to $77 \%$ is 12 minutes, then the half life of the substance in minutes is

13Atoms And Nuclei

The difference between the frequencies of second and first Paschen lines of hydrogen atom is ( $R=$ Rydberg constant and $c=$ speed of light in vacuum)

14Atoms And Nuclei

Each nuclear fission of ${ }^{235} \mathrm{U}$ releases 200 MeV of energy. If a reactor generates 1 MW power, then the rate of fission in the reactor is

15Atoms And Nuclei

The ratio of the wavelengths of the first Lyman line and the second Balmer line of hydrogen atom is

16Atoms And Nuclei

If the half-life of a radioactive element is 12.5 hours, then the time taken to disintegrate 256 g of the substance into 1 g is (in hours)

17Atoms And Nuclei

The difference between the frequencies of the first and second Lyman lines of hydrogen atom is ( $R=$ Rydberg constant and $c=$ speed of light in vacuum)

18Atoms And Nuclei

For an observer on the Earth, if a spectral line of wavelength $6600\mathop {\rm{A}}\limits^{\rm{o}}$ emitted by a star is found to be red shifted by $22 \mathop {\rm{A}}\limits^{\rm{o}}$, then the star is

19Atoms And Nuclei

An element $X$ of a half-life of $1.4 \times 10^9$ years decays to form another stable element $Y$. A sample is taken from a rock that contains both $X$ and $Y$ in the ratio $1: 7$. If at the time of formation of the rock $Y$ was not presen...

20Atoms And Nuclei

Energy levels $A, B$ and $C$ of a certain atom corresponding to increasing values of energy i.e $E_A < E_B < E_C$. If $\lambda_1, \lambda_2$ and $\lambda_3$ are the wavelengths of a photon corresponding to the transitions shown then.

21Atoms And Nuclei

In a nuclear reactor, the fuel is consumed at the rate of $1 \times 10^{-3} \mathrm{gs}^{-1}$. The power generated in kW is

22Atoms And Nuclei

The half-life period of a radioactive element $A$ is 62 years. It decays into another stable element $B$. An archaeologist found a sample in which $A$ and $B$ are in 1:15 ratio. The age of the sample is

23Atoms And Nuclei

The ratio of minimum wavelength of Balmer series to maximum wavelength in Brackett series in hydrogen spectrum is

24Atoms And Nuclei

The principle quantum number $n$ corresponding to the exited state of $\mathrm{He}^{+}$ion. If on transition to the ground state two photons in succession with wavelength $1026 \mathop {\rm{A}}\limits^{\rm{o}}$ and $304 \mathop {\rm{A}}\lim...

25Atoms And Nuclei

Which physical quantity is measured in barn?

26Atoms And Nuclei

The ground state energy of hydrogen atom is -13.6 eV . The potential energy of the electron in this state is

27Atoms And Nuclei

If the energy released per fission of a ${ }_{92}^{235} \mathrm{U}$ nucleus is 200 MeV . The energy released in the fission of 0.1 kg d ${ }_{92}^{235} \mathrm{U}$ in kilowatt - hour is

28Atoms And Nuclei

The electrostatic potential energy of the electron in an orbit of hydrogen is -6.8 eV . The speed of the electron in this orbit is ( $c$ is speed of light in vacuum)

29Atoms And Nuclei

The surface areas of two nuclei are in the ratio $9: 25$. The mass number of the nuclei are in the ratio

30Atoms And Nuclei

$\mu$-meson of charge $e$, mass $208 m_e$ moves in a circular orbit around a heavy nucleus having charge $+3 e$. The quantum state $n$ for which the radius of the orbit is same as that of the first Bohr orbit for hydrogen atom is (approxima...

31Atoms And Nuclei

A nucleus with atomic mass number $A$ produces another nucleus by loosing 2 alpha particles. The volume of the new nucleus is 60 times that of the alpha particle. The atomic mass number $A$ of the original nucleus is

32Atoms And Nuclei

One mole of radium has an activity of $\frac{1}{3.7}$ kilo curie. Its decay constant is(Avagadro number $=6 \times 10^{23} \mathrm{~mol}^{-1}$ )

33Atoms And Nuclei

The speed of the electron in a hydrogen atom in the $n=3$ level is(Planck's constant $=6.6 \times 10^{-34} \mathrm{Js}$ )

34Atoms And Nuclei

Inner shell electrons in atoms moving from one energy level to another lower energy level produce

35Atoms And Nuclei

The decrease in each day in the uranium mass of the material in a uranium reactor operating at a power of 12 MW is (Energy released in one ${ }_{92} \mathrm{U}^{235}$ fission is about 200 MeV )

36Atoms And Nuclei

A hydrogen atom falls from $n$th higher energy orbit to first energy orbit $(n=1)$. The energy released is equal to 12.75 eV . The $n$th orbit is

37Atoms And Nuclei

A mixture consists of two radioactive materials $A_1$ and $A_2$ with half lives of 20 s and 10 s respectively. Initially, the mixture has 40 g of $A_1$ and 160 g of $A_2$. The amount of the two in the mixture will become equal after

38Atoms And Nuclei

If the binding energy of the electron in a hydrogen atom is 13.6 eV . Then, energy required to remove electron from first excited state of $\mathrm{Li}^{2+}$ is

39Atoms And Nuclei

The relation between the mean-life time $\tau$ and the half-life time $T_{1 / 2}$ of a radioactive substance is

40Atoms And Nuclei

The transition of an electron in hydrogen atom that emits a photon whose wavelength lies in the ultraviolet region of the electromgnetic spectrum is

41Atoms And Nuclei

The radius of the nucleus of an atom whose mass number is 125 is

42Atoms And Nuclei

The centripetal acceleration $a$ of an electron in an orbit of hydrogen and the principal quantum number $n$ of the orbit are related by

43Atoms And Nuclei

A ancient discovery found a sample, where \(75 \%\) of the original carbon (\(\mathrm{C}^{14}\)) remains. Then the age of the sample is
\(\binom{T_{\frac{1}{2}}\left(C^{14}\right)=5730 \text { years, } \ln 0.5=-0.7}{\ln (0.75)=-0.3}\)

44Atoms And Nuclei

Choose the correct statement of the following

45Atoms And Nuclei

An electron in the hydrogen atom excites from 2nd orbit to 4th orbit then the change in angular momentum of the electron is (Planck's constant \(h=6.64 \times 10^{-34} \mathrm{~J}-\mathrm{s}\))

46Atoms And Nuclei

Energy of a stationary electron in the hydrogen atom is \(E=\frac{13.6}{n^2} \mathrm{~eV}\), then the energies required to excite the electron in hydrogen atom to (a) its second excited state and (b) ionised state, respectively.

47Atoms And Nuclei

The graph of \(\ln \left(\frac{R}{R_0}\right)\) versus $\ln A$ is where \(R\) is radius of a nucleus, \(A\) is its mass number, and \(R_0\) is constant

48Atoms And Nuclei

The radius of an atomic nucleus of mass number 64 is 4.8 fermi. Then the mass number of another atomic nucleus of radius 6 fermi is

49Atoms And Nuclei

A hydrogen atom at the ground level absorbs a photon and is excited n = 4 level. The potential energy of the electron in the excited state is

50Atoms And Nuclei

Which of the following values is the correct order of nuclear density?