Atoms and Nuclei PYQs - Last 10 Years

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Practice 47 KCET 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 10 Years Atoms and Nuclei Questions

Showing 47 of 47 filtered questions.

1Atoms And Nuclei

The radius of first orbit in hydrogen atom is $5.3 \times 10^{-11}$ m. The kinetic energy $E_K$, potential energy $E_P$ and total energy $E_T$ of electron in first orbit are

2Atoms And Nuclei

Bohr's second postulate implies quantisation of

3Atoms And Nuclei

An electron transition takes place from excited state to ground state in hydrogen atom, then

4Atoms And Nuclei

Which of the following statements is incorrect with reference of 'Nuclear force'?

5Atoms And Nuclei

\(\text { Match the following types of nuclei with examples shown }\)
$$ \begin{array}{|l|l|} \hline \text { Column-I } & \text { Column-II } \\ \hline \text { A. Isotopes } & \text { i. } \mathrm{Li}^7, \mathrm{Be}^7 \\ \hline \text { B....

6Atoms And Nuclei

If the radius of first Bohr orbit is $r$, then the radius of the second Bohr orbit will be

7Atoms And Nuclei

The natural logarithm of the activity $R$ of a radioactive sample varies with time $t$ as shown. At $t=0$, there are $N_0$ undecayed nuclei. Then, $N_0$ is equal to [Take $e^2=7.5$ ]

8Atoms And Nuclei

In alpha particle scattering experiment, if $v$ is the initial velocity of the particle, then the distance of closest approach is $d$. If the velocity is doubled, then the distance of closest approach becomes

9Atoms And Nuclei

The ratio of volume of $\mathrm{Al}^{27}$ nucleus to its surface area is (Given, $R_0=1.2 \times 10^{-15} \mathrm{~m}$)

10Atoms And Nuclei

The ratio of area of first excited state to ground state of orbit of hydrogen atom is

11Atoms And Nuclei

Consider the nuclear fission reaction ${ }_0^1 n+{ }_{92}^{235} \mathrm{U} \longrightarrow{ }_{56}^{144} \mathrm{Ba}+{ }_{36}^{89} \mathrm{Kr}+3{ }_0^1 n$. Assuming all the kinetic energy is carried away by the fast neutrons only and total ...

12Atoms And Nuclei

A nucleus with mass number 220 initially at rest emits an alpha particle. If the \(Q\) value of reaction is \(5.5 ~\mathrm{MeV}\). Calculate the value of kinetic energy of alpha particle

13Atoms And Nuclei

In the following equation representing \(\beta^{-}\) decay, the number of neutrons in the nucleus \(X\) is
\({ }_{83}^{210} \mathrm{Bi} \longrightarrow X+e^{-1}+\bar{v}\)

14Atoms And Nuclei

A radioactive sample has half-life of 3 years. The time required for the activity of the sample to reduce to \(\frac{1}{5}\)th of its initial value is about

15Atoms And Nuclei

Three energy levels of hydrogen atom and the corresponding wavelength of the emitted radiation due to different electron transition are as shown. Then,

16Atoms And Nuclei

In the Rutherford's alpha scattering experiment, as the impact parameter increases, the scattering angle of the alpha particle

17Atoms And Nuclei

A nuclear reactor delivers a power of \(10^9 \mathrm{~W}\), the amount of fuel consumed by the reactor in one hour is

18Atoms And Nuclei

Which of the following radiations is deflected by electric field?

19Atoms And Nuclei

Binding energy of a nitrogen nucleus \(\left[{ }_7^{14} \mathrm{~N}\right]\), given \(m\left[{ }_7^{14} \mathrm{~N}\right]=14.00307 \mathrm{u}\)

20Atoms And Nuclei

If an electron is revolving in its Bohr orbit having Bohr radius of 0.529\(\mathop A\limits^o\), then the radius of third orbit is

21Atoms And Nuclei

In accordance with the Bohr's model, the quantum number that characterises the Earth's revolution around the Sun in an orbit of radius \(1.5 \times 10^{11} \mathrm{~m}\) with orbital speed \(3 \times 10^4 \mathrm{~ms}^{-1}\) is
[given, mass...

22Atoms And Nuclei

The radius of hydrogen atom in the ground state is 0.53\(\mathop A\limits^o\). After collision with an electron, it is found to have a radius of 2.12\(\mathop A\limits^o\), the principal quantum number \(n\) of the final state of the atom...

23Atoms And Nuclei

The figure shows standing de-Broglie waves due to the revolution of electron in a certain orbit of hydrogen atom. Then, the expression for the orbit radius is (All notations have their usual meanings)

24Atoms And Nuclei

Which graph in the following diagram correctly represents the potential energy of a pair of nucleons as a function of their separation?

25Atoms And Nuclei

In a nuclear reactor heavy nuclei is not used as moderators because

26Atoms And Nuclei

An electron in an excited state of \(\mathrm{Li}^{2+}\) ion has angular momentum \(\frac{3 h}{2 \pi}\). The de-Broglie wavelength of electron in this state is \(p \pi a_0\) (where, \(a_0=\) Bohr radius). The value of \(p\) is

27Atoms And Nuclei

Energy of an electron in the second orbit of hydrogen atom is \(E_2\). The energy of electron in the third orbit of \(\mathrm{He}^{+}\) will be

28Atoms And Nuclei

A beam of fast moving alpha particles were directed towards a thin film of gold. The parts \(A, B\) and \(C\) of the transmitted and reflected beams corresponding to the incident parts \(A, B\) and \(C\) of the beam are shown in the adjoini...

29Atoms And Nuclei

A radio-active elements has half-life of 15 years. What is the fraction that will decay in 30 years?

30Atoms And Nuclei

During a \(\beta^{-}\)-decay

31Atoms And Nuclei

Angular momentum of an electron in hydrogen atom is \(\frac{3 h}{2 \pi}\) (\(h\) is the Planck's constant). The KE of the electron is

32Atoms And Nuclei

Two protons are kept at a separation of \(10 \mathrm{~nm}\). Let \(F_n\) and \(F_e\) the nuclear force and the electromagnetic force between them

33Atoms And Nuclei

The period of revolution of an electron revolving in nth orbit of \(\mathrm{H}\)-atom is proportional to

34Atoms And Nuclei

Which one of the following nuclei has shorter mean life?

35Atoms And Nuclei

The end product of decay of \({ }_{90} \mathrm{Th}^{232}\) is \({ }_{82} \mathrm{~Pb}^{208}\). The number of \(\alpha\) and \(\beta\) particles emitted are respectively

36Atoms And Nuclei

A hydrogen atom is ground state absorbs \(10.2 \mathrm{~eV}\) of energy. The orbital angular momentum of the electron is increased by

37Atoms And Nuclei

Frequency of revolution of an electron revolving in \(n\)th orbit of \(\mathrm{H}\)-atom is proportional to

38Atoms And Nuclei

In Rutherford experiment, for head-on collision of \(\alpha\)-particles with a gold nucleus, the impact parameter is

39Atoms And Nuclei

The period of revolution of an electron in the ground state of hydrogen atom is $T$. The period of revolution of the electron in the first excited state is

40Atoms And Nuclei

The total energy of an electron revolving in the second orbit of hydrogen atom is

41Atoms And Nuclei

The half-life of tritium is 12.5 years. What mass of tritium of initial mass 64 mg will remain undecayed after 50 years?

42Atoms And Nuclei

The energy equivalent to a substance of mass 1 g is

43Atoms And Nuclei

The particle emitted in the decay of ${ }_{92}^{238} \mathrm{U}$ to ${ }_{92}^{234} \mathrm{U}$

44Atoms And Nuclei

In a nuclear reactor, the function of the moderator is to decreases

45Atoms And Nuclei

The energy (in eV ) required to excite an electron from $n=2$ to $n=4$ state in hydrogen atom is

46Atoms And Nuclei

The mass defect of ${ }_2^4 \mathrm{He}$ is 0.03 u . The binding energy per nucleon of helium (in MeV) is

47Atoms And Nuclei

The scientist who is credited with the discovery of 'nucleus' in an atom is