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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 First spectral series of hydrogen atom was discovered by
  • A. Lyman
  • B. Rydberg
  • C. Balmer
  • D. Paschen
2 X-rays were discovered by
  • A. Curie
  • B. Henry Becquerel
  • C. Rontgen
  • D. None of these
3 Laser can be made by creating.
  • A. Meta stable
  • B. Population inversion
  • C. Excited state
  • D. All of these
4 The Balmer series is obtained when all the transition of electrons terminate on
  • A. 1<sup>st</sup> orbit
  • B. 2nd orbit
  • C. 3rd orbit
  • D. 4th orbit
5 For Paschen series, the value of 'n' starts from
  • A. 2
  • B. 4
  • C. 6
  • D. 8
6 For an atom of hydrogen atom the radius of the first orbit is given by:
  • A. H/me<sup>2</sup>
  • B. me/4h<sup>2</sup>
  • C. h2/4<span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 16px;">π<sup>2</sup> kme<sup style="">2</sup></span>
  • D. h<sup>2</sup> me<sup>2</sup>
7 Black Body radiation spectrum is an example of:
  • A. Atomic spectra
  • B. Line spectra
  • C. Continuous spectra
  • D. None of above
8 An electron in H -atom is excited from ground state n=4 , How many spectral lines are possible in this case.
  • A. 6
  • B. 5
  • C. 4
  • D. 3
9 The longest wavelength of Paschen series is.
  • A. 656 nm
  • B. 1094 nm
  • C. 1875 nm
  • D. 2000 nm
10 Which is not characteristic of Laser.
  • A. Monochromatic
  • B. Coherent
  • C. Intense
  • D. Multi direction

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