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ATOMIC STRUCTURE QUIZ-10

Dear Readers,

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 volume of a proton is approximately:
  •  1.5×10^(-30) cm^3
  •  1.5×10^(-38) cm^3
  •  1.5×10^(-34) cm^3
  •  None of these
Solution
An experimental fact.

Q2.When the frequency of light incident on a metallic plate is doubled, the KE of the emitted photoelectrons will be:
  •  Douled
  •  Halved
  •  Increased but more than doubled of the previous KE
  •  Unchanged
Solution
hv_1=work function+K∙E_1 2×hv_1=work function+K∙E_2

Q3.  The wavelength of a spectral line emitted by hydrogen atom in the Lyman series is16/15R cm. What is the value of n_2?(R=Rydberg constant)
  •   2
  •  3
  •  4
  •  1
Solution
For Lyman series, 1/λ=R[1/1^2 -1/(n_2^2 )] 15R/16=R[1/1^2 -1/(n_2^2 )] 15R/16R=[(n_2^2-1)/(n_2^2 )] 15/16=(n_2^2-1)/(n_2^2 ) 15n_2^2=16n_2^2-16 n_2^2=16,n_2=4

Q4. Ground state electronic configuration of nitrogen atom can be represented as
  •  

  •  

  •  

  •  


Solution


Q5.Which diagram best represents the appearance of the line spectrum of atomic hydrogen in the visible region?
  •  

  •  

  •  

  •  



Solution
  

Q6. Who introduced the concept of electron spin?
  •  Schrodinger
  •  Planck
  •  Bohr
  •  Uhlenbeck and Gaudsmit
Solution
They proposed the concept of electron spin.

Q7.Which is not basic postulate of Dalton's atomic theory?
  •  Atoms are neither created nor destroyed in a chemical reaction
  •  In a given compound, the relative number and kinds of atoms are constant
  •  Atoms of all elements are alike, including their masses
  •  Each element is composed of extremely small particles called atoms
Solution
Atoms of an element are alike.

Q8.The threshold frequency of a metal is 4×10^14 s^(-1). The minimum energy of photon to cause photoelectric effect is:
  •  3.06×10^(-12) J
  •  1.4×10^(-18) J
  •  3.4×10^(-19) J
  •  2.64×10^(-19) J
Solution
E_Mini=hv_0

Q9.In photoelectric effect the number of photo-electron emitted is proportional to :
  •  Intensity of incident beam
  •  Frequency of incident beam
  •  Velocity of incident beam
  •  Work function of photo cathode
Solution
More intense beam will give out more electrons.


Q10. Which of the following elements has least number of electrons in its M-shell?
  •  K
  •  Mn
  •  Ni
  •  Sc
Solution
〖_19〗K=1s^2,2s^2 2p^6,3s^2 3p^6,4s^1 〖_25〗Mn=1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^5 〖_28〗Ni=1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^8 〖_21〗Sc=1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^1 Therefore, K has least number of electrons in its M-shell (n=3)=8.

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