Atoms and Nuclei · Physics · AP EAPCET

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MCQ (Single Correct Answer)

1

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 $304 \mathop {\rm{A}}\limits^{\rm{o}}$ are emitted $\left(R=1.097 \times 10^{-7} \mathrm{~m}^{-1}\right)$

AP EAPCET 2024 - 22th May Evening Shift
2
Which physical quantity is measured in barn?
AP EAPCET 2024 - 22th May Evening Shift
3

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

AP EAPCET 2024 - 22th May Morning Shift
4

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

AP EAPCET 2024 - 22th May Morning Shift
5
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)
AP EAPCET 2024 - 21th May Evening Shift
6
The surface areas of two nuclei are in the ratio $9: 25$. The mass number of the nuclei are in the ratio
AP EAPCET 2024 - 21th May Evening Shift
7
The ground state energy of hydrogen atom is -13.6 eV . The potential energy of the electron in this state is
AP EAPCET 2024 - 21th May Morning Shift
8
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
AP EAPCET 2024 - 21th May Morning Shift
9
Inner shell electrons in atoms moving from one energy level to another lower energy level produce
AP EAPCET 2024 - 20th May Evening Shift
10

The speed of the electron in a hydrogen atom in the $n=3$ level is

(Planck's constant $=6.6 \times 10^{-34} \mathrm{Js}$ )

AP EAPCET 2024 - 20th May Evening Shift
11

One mole of radium has an activity of $\frac{1}{3.7}$ kilo curie. Its decay constant is

(Avagadro number $=6 \times 10^{23} \mathrm{~mol}^{-1}$ )

AP EAPCET 2024 - 20th May Evening Shift
12
$\mu$-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 (approximately]
AP EAPCET 2024 - 20th May Morning Shift
13
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
AP EAPCET 2024 - 20th May Morning Shift
14
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
AP EAPCET 2024 - 19th May Evening Shift
15
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 )
AP EAPCET 2024 - 19th May Evening Shift
16
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
AP EAPCET 2024 - 18th May Morning Shift
17
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
AP EAPCET 2024 - 18th May Morning Shift
18

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 $$h=6.64 \times 10^{-34} \mathrm{~J}-\mathrm{s}$$)

AP EAPCET 2022 - 5th July Morning Shift
19

Choose the correct statement of the following

AP EAPCET 2022 - 5th July Morning Shift
20

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

AP EAPCET 2022 - 5th July Morning Shift
21

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

AP EAPCET 2022 - 4th July Evening Shift
22

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

AP EAPCET 2022 - 4th July Evening Shift
23

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.

AP EAPCET 2022 - 4th July Morning Shift
24

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

AP EAPCET 2022 - 4th July Morning Shift
25

The angular momentum of the orbital electron is integral multiple of

AP EAPCET 2021 - 20th August Morning Shift
26

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

AP EAPCET 2021 - 20th August Morning Shift
27

The ionisation potential of hydrogen atom is 13.6 V. How much energy need to be supplied to ionise the hydrogen atom in the first excited state?

AP EAPCET 2021 - 19th August Evening Shift
28

Which of the following statement is correct?

AP EAPCET 2021 - 19th August Evening Shift
29

Potential energy between a proton and an electron is given by $$U=\frac{K e^2}{3 R^3}$$, then radius of Bohr's orbit can be given by

AP EAPCET 2021 - 19th August Morning Shift
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