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20th Chapter

12th Class Physics Chapter 20 Test

Here you can prepare 12th Class Physics Chapter 20 Atomic Spectra Test. Click the button for 100% free full practice test.

2nd Year Physics Chapter 20 Online MCQ Test for 12th Class Physics Chapter 20 (Atomic Spectra)

This online test contains MCQs about following topics:

- Atomic Spectra
- Bohr's Model of the Hydrogen Atom
- Inner Shell Transitions and Characteristic X-Rays
- Uncertainty Within the Atom
- Laser

Ics Part 2 Physics Chapter 20 Test
ic

2nd Year Physics Chapter 20 Online MCQ Test for 12th Class Physics Chapter 20 (Atomic Spectra)

Sr. # Questions Answers Choice
1 Photons emitted in inner shell transition are.
  • A. Continuous X -rays
  • B. Discontinuous X rays
  • C. Characteristic X rays
  • D. Energetic X rays
2 Energy produced due to fission of uranium atom is:
  • A. 500MeV
  • B. 200MeV
  • C. 700MeV
  • D. 750MEV
3 The rest mass x ray photon is
  • A. Infinite
  • B. Zero
  • C. 1.67 X<sup>-17</sup> kg
  • D. All of the above
4 Frequency of x-rays depends upon.
  • A. Number of electrons striking target
  • B. Accelerating potencial
  • C. Nature of the target
  • D. Both B and C
5 The 1<sup>st</sup> Bohr atom in the hydrogen atom has radius
  • A. 3.56 x 10<sup>-10</sup> m
  • B. 0.053 x 10<sup>-11</sup> m
  • C. 0.53 x 10<sup>-11</sup> m
  • D. 5.30 x 10<sup>-11</sup> m
6 Which series lies in the ultraviolet region.
  • A. Balmer series
  • B. Bracket series
  • C. Ptund series
  • D. Lyman series
7 Boher proposed his atomic model in:
  • A. 1910
  • B. 1911
  • C. 1912
  • D. 1913
8 Which of the following series of hydrogen spectrum lies in ultra violet region.
  • A. Lyman sereis
  • B. Paschen series
  • C. Balmar series
  • D. Bracket series
9 The value of Rydberg constant is:
  • A. 1.0749x10<sup>7</sup>m<sup>-1</sup>
  • B. 1.0974 x 10<sup>7</sup> m<sup>-1</sup>
  • C. 1.974 x10<sup>6</sup>m<sup>-1</sup>
  • D. 1.0974 x 10<sup>-7</sup> m<sup>-1</sup>
10 Black Body radiation spectrum is an example of:
  • A. Atomic spectra
  • B. Line spectra
  • C. Continuous spectra
  • D. None of above

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