Atoms and Nuclei PYQs - Last 5 Years

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Practice 73 TS EAMCET 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 73 filtered questions.

1Atoms And Nuclei

If the ratio of the mass numbers of two nuclei is $27: 125$, then the ratio of their surface areas is

2Atoms And Nuclei

If $87.5 \%$ of atoms of a radioactive element decay in 6 days, then the fraction of atoms of the element that decay in 8 days is

3Atoms And Nuclei

If the total energy of an electron in an orbit is positive, then

4Atoms And Nuclei

During the disintegration of a radioactive nucleus of mass number 208 at rest, two alpha particles each with kinetic energy $E$ are emitted. The total kinetic energy of the emitted alpha particles and the daughter nucleus after the disinteg...

5Atoms And Nuclei

The maximum wavelength of incident radiation required to ionize a hydrogen atom in its ground state is nearly

6Atoms And Nuclei

When an element ${ }_{90}^{232} \mathrm{Th}$ decays into ${ }_{82}^{208} \mathrm{~Pb}$, the number of $\alpha$ and $\beta^{-}$particles emitted respectively are

7Atoms And Nuclei

If the number of uranium nuclei required per hour to produce a power of 64 kW is $7.2 \times 10^{18}$, then the energy released per fission is

8Atoms And Nuclei

A radioactive material of half-life 2.5 hours emits radiation that is 32 times the safe maximum level. The time (in hours) after which the material can be handled safely is

9Atoms And Nuclei

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

10Atoms And Nuclei

The phenomenon of physics that deals with the constitution and structure of matter at the minute scales of atoms and nuclei is

11Atoms And Nuclei

The range of weak nuclear force is of the order of

12Atoms And Nuclei

If a radioactive substance decays $10 \%$ in every 16 hours, then the percentage of the radioactive substance that remains after 2 days is

13Atoms And Nuclei

If a nucleus $P$ converts into a nucleus $Q$ by the decay of one alpha particle and two $\beta^{-}$particles, then the nuclei $P$ and $Q$ are

14Atoms And Nuclei

The potential energy of an electron in an orbit of hydrogen atom is -6.8 eV . The de-Broglie wavelength of the electron in this orbit is
( $r_o$ is Bohr radius)

15Atoms And Nuclei

If $96.875 \%$ of a radioactive substance decays in 10 days, then the half life of the substance is (in days)

16Atoms And Nuclei

The average energy of a neutron produced in the fission of ${ }_{92}^{235} \mathrm{U}$ is

17Atoms And Nuclei

If the difference in the frequencies of the first and second lines of Lyman series of hydrogen atom is $f$, then the difference in frequencies of the first and second lines of Balmer series of hydrogen atom is

18Atoms And Nuclei

The ratio of the kinetic energies of the electrons in the third and fourth excited states of hydrogen atom is

19Atoms And Nuclei

Two radioactive substances $A$ and $B$ have same number of initial nuclei. If the half lives of $A$ and $B$ are 1.5 days and 4.5 days respectively, then the ratio of the number of nuclei remaining in $A$ and $B$ after 9 days is

20Atoms And Nuclei

Bose-Einstein statistics is applicable to particles with

21Atoms And Nuclei

In $\beta^{-}$decay, a neutron transforms into a proton within the nucleus according to the equation :
neutron $\rightarrow$ proton $+\beta^{-}+x$
In this equation the particle represented by ' $x$ ' is

22Atoms And Nuclei

At room temperature, gaseous hydrogen is bombarded with a beam of electrons of 13.6 eV energy. The series to which the emitted spectral line belongs to

23Atoms And Nuclei

An element consists of a mixture of three isotopes $A, B$ and $C$ of masses $m_1, m_2$ and $m_3$, respectively. If the relative abundances of the three isotopes $A, B$ and $C$ are in the ratio $2: 3: 5$, the average mass of the element is

24Atoms And Nuclei

The half-life of a radioactive substance is 12 min . The time gap between $28 \%$ decay and $82 \%$ decay of the radioactive substance is

25Atoms And Nuclei

The energy released by the fission of one uranium nucleus is 200 MeV . The number of fissions per second required to produce 128 W power is

26Atoms And Nuclei

The ratio of the wavelengths of radiation emitted when an electron in the hydrogen atom jumps from 4th orbit to 2 nd orbit and from 3rd orbit to 2 nd orbit is

27Atoms And Nuclei

The half lives of two radioactive material $A$ and $B$ are respectively $T$ and $2 T$. If the ratio of the initial masses of the materials $A$ and $B$ is $8: 1$. Then, the time after which the ratio of the masses of the materials $A$ and $B...

28Atoms And Nuclei

The related effort to derive the properties of a bigger, more complex system from the properties and interactions of its constituent simpler parts is

29Atoms And Nuclei

If the ratio of the radii of nuclei ${ }_{52} X^{A}$ and ${ }_{13} \mathrm{AI}^{27}$ is $5: 3$, then the number of neutrons in the nucleus $X$ is

30Atoms And Nuclei

In hydrogen atom, the frequency of the photon emitted when an electron jumps from second orbit to first orbit is $f$. The frequency of the photon emitted when an electron jumps from third excited state to first excited state is

31Atoms And Nuclei

Half-life periods of two nuclei $A$ and $B$ are $T$ and $2 T$ respectively. Initially $A$ and $B$ have same number of nuclei. After a time of $4 T$, the ratio of the remaining number of nuclei of $A$ and $B$ is

32Atoms And Nuclei

An $\alpha$-particle of energy $E$ is liberated during the decay of a nucleus of mass number 236. The total energy released in this process is

33Atoms And Nuclei

The ratio of the centripetal accelerations of the electron in two successive orbits of hydrogen is $81: 16$. Due to ${ }^3$ transition between these two states, the angular momentum of the electron changes by ( $h=$ Planck's constant)

34Atoms And Nuclei

The operation of a nuclear reactor is said to be critical when the value of neutron multiplication factor $K i s$

35Atoms And Nuclei

After the decay of a single $\beta$-particle, the parent and daughter nuclei are

36Atoms And Nuclei

$\mathrm{A}_{92} \mathrm{U}^{238}$ nucleus decays to a ${ }_{82} \mathrm{~Pb}^{214}$ nucleus. The number of $\alpha$ and $\beta^{-}$particles emitted are

37Atoms And Nuclei

The ground state energy of hydrogen atom is -13.6 cv . The potential energy of the electron in the first excited state of hydrogen is

38Atoms And Nuclei

The half-life period of element $X$ is same as the mean life time of element $Y$. Assume initially $X$ and $Y$ have same number of atoms. Then

39Atoms And Nuclei

The ratio of the relative strengths of strong and weak nuclear forces is

40Atoms And Nuclei

Heavy water is used as moderator in nuclear reactor because

41Atoms And Nuclei

In a hypothetical Bohr hydrogen atom, if the mass of the electron is doubled then the energy of the electron in the first orbit is

42Atoms And Nuclei

Energy released in the fission of a single uranium nucleus is 200 MeV . Then the number of fissions per second to produce 5 mW power is

43Atoms And Nuclei

The ratio of longest wavelengths of the spectral lines in the Lyman and Balmer series of hydrogen spectrum is

44Atoms And Nuclei

Half-life of a radioactive substance $A$ is two times the half-life of another radioactive substance $B$. Initially the number of nuclei of $A$ and $B$ are $N_A$ and $N_B$ respectively. After three half-lives of $A$, the number of nuclei of...

45Atoms And Nuclei

Match the following.
(Take the relative strength of the strongest fundamental forces in nature as one)

.tg {border-collapse:collapse;border-spacing:0;}

.tg td{border-color:black;border-style:solid;border-width:1px;font-family:Arial, san...

46Atoms And Nuclei

In the nuclear fission of one nucleus of $\mathrm{U}^{235}$ the energy released is 188 MeV . The energy released in the nuclear fission of 235 g of $\mathrm{U}^{235}$ is nearly
(Avogadro number $=6.02 \times 10^{23} \mathrm{~mol}^{-1}$ )

47Atoms And Nuclei

In hydrogen spectrum, the shortest and longest wavelengths of Balmer series are $\lambda_1$ and $\lambda_2$ respectively. The Rydberg constant of hydrogen is

48Atoms And Nuclei

$\alpha$-decay of a parent nucleus $X$ results in a daughter nucleus $Y$. If $m_x, m_y$ and $m_\alpha$ are the masses of the parent nucleus, the daughter nucleus and the $\alpha$-particles respectively, then the net kinetic energy gained in...

49Atoms And Nuclei

The nucleus ${ }_{50}^{120} X$ undergoes the series of reactions given below:
\({ }_Z^A X \xrightarrow{\alpha \text {-decay }} P \xrightarrow{\beta^{-} \text {-decay }} Q \xrightarrow{\alpha \text {-decay }} R\)
The number of neutrons in ...

50Atoms And Nuclei

The radius of a nucleus of mass number 27 is $R$. Which of the following is true about a nucleus whose radius is $2 R$ ?