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.

Second Year Physics Chapter 20 Online MCQ Test for 2nd Year Physics Chapter 20 Atomic Spectra Preparation

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

FSC Part 2 Physics Ch 20 Test
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Second Year Physics Chapter 20 Online MCQ Test for 2nd Year Physics Chapter 20 Atomic Spectra Preparation

Sr. # Questions Answers Choice
1 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>
2 _____ has the largest de Broglie wavelength at same speed.
  • A. Proton
  • B. Alpha particle
  • C. Carbon atom
  • D. Electron
3 Which is not true for X rays
  • A. X rays are not defected by electric field
  • B. X rays are polarized
  • C. X rays consist of electromagnetic waves
  • D. X rays can be diffracted by grating
4 If the ionization energy of hydrogen atom is 13.6 eV, its ionization potential will be
  • A. 136.0 volt
  • B. 3.0 volt
  • C. 13.6 volt
  • D. None of these
5 Life time of metastable states is
  • A. 10<sup>-6</sup> sec or more
  • B. 10<sup>-3</sup> sec or more
  • C. 10<sup>-5</sup> sec or more
  • D. None of these
6 Laser can be made by creating.
  • A. Meta stable
  • B. Population inversion
  • C. Excited state
  • D. All of these
7 Which is not characteristic of Laser.
  • A. Monochromatic
  • B. Coherent
  • C. Intense
  • D. Multi direction
8 We can find from de Broglie formula
  • A. Wavelength
  • B. Amplitude
  • C. Speed of wave
  • D. Frequency of wave
9 &nbsp;Charge on an atom is:
  • A. Positive
  • B. Negative
  • C. Neutral
  • D. None of these
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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