## ATOMIC STRUCTURE QUIZ-2

As per analysis for previous years, it has been observed that students preparing for NEET find Physics out of all the sections to be complex to handle and the majority of them are not able to comprehend the reason behind it. This problem arises especially because these aspirants appearing for the examination are more inclined to have a keen interest in Biology due to their medical background.

Furthermore, sections such as Physics are dominantly based on theories, laws, numerical in comparison to a section of Biology which is more of fact-based, life sciences, and includes substantial explanations. By using the table given below, you easily and directly access to the topics and respective links of MCQs. Moreover, to make learning smooth and efficient, all the questions come with their supportive solutions to make utilization of time even more productive. Students will be covered for all their studies as the topics are available from basics to even the most advanced.

Q1. The ratio of the radius of the orbit for the electron orbiting the hydrogen nucleus to that of an electron orbiting a deuterium nucleus is:
•  1∶1
•  1∶2
•  2∶1
•  1∶3
Solution
It is due to isotopic effect.

Q2.Minimum number of photons of light of wavelength 4000 â„«, which provide 1 J energy:
•  2×10^18
•  2×10^9
•  2×10^20
•  2×10^10
Solution
E=n hc/Î» h=6.6×10^(-34) Js or 1J=(n×6.6×10^(-34)×3×10^8)/(4000×10^(-10) )

Q3.  The characteristic not associated with Planck’s theory is
•   Radiations are associated with energy
•  The magnitude of energy associated with a quantum is proportional to frequency
•  Radiation energy is neither emitted nor absorbed continuously
•  Radiation energy is neither emitted nor absorbed discontinuously
Solution

Q4. If an electron has spin quantum number of +1/2 and a magnetic quantum number of -1, it cannot be represented in an
•  s-orbital
•  p-orbital
•  d-orbital
•  f-orbital
Solution
m=-1 is not possible for s-orbital (l=0)

Q5.Atoms consist of electrons, protons and neutrons. If the mass attributed to neutron was halved and that attributed to the electrons was doubled, the atomic mass of _6 C^12 would be approximately:
•  same
•  doubled
•  halved
•  Reduced by 25%
Solution
No charge by doubling mass of electrons, however, by reducing mass of neutron to half total atomic mass becomes 6+3 instead of 6+6. Thus, reduced by 25%.

Q6. In 'aufbau principle^', the term aufbau represents:
•  The name of scientist
•  German term meaning for building up
•  The energy of electron
•  The angular momentum of electron
Solution
Aufbau is a german term meaning for building up.

Q7.If the nitrogen atom had electronic configuration 1s^7, it would have energy lower than that of the normal ground state configuration 1s^2 2s^2 2p^3, because the electrons would be closer to the nucleus. Yet 1s^7 is not observed because is violates :
•  Heisenberg’s uncertainty principle
•  Hund’s rule
•  Pauli's exclusion principle
•  Bohr's postulate of stationary orbits
Solution
As per Pauli's exclusion principle “no two electrons in the same atom can have all the four quantum numbers equal or an orbital cannot contain more than two electrons and it can accommodate two electrons only when their directions of spins are opposite.”

Q8.A photon is:
•  A quanta of light (or electromagnetic) energy
•  A quanta of matter
•  A positively charged particle
•  An instrument for measuring light intensity
Solution

Q9.The mass of one one mole of electron is :
•  0.55mg
•  0.008mg
•  1.008mg
•  0.184mg
Solution
Mass on one mole electron =N×m_e=6.023×10^23×9.108×10^(-31) kg

Q10. q
•  a
•  b
•  c
•  d
Solution
In _1 H^3, nucleons are 3.

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