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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.

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 The first laser was built by
  • A. ArthursSchawalow
  • B. T.H.Maiman
  • C. Peter Sorokin
  • D. C.H.Townes
2 When meta I is heated sufficiently electrons are given off by the metal. This phenomenon is known as.
  • A. Photoelectric effect
  • B. Piezo electric effect
  • C. Thermionic emission
  • D. Secondary emission
3 The velocity of electron moving is 1st orbit of hydrogen atom is:
  • A. 2.09 x 10<sup>6</sup> ms<sup>-1&nbsp;</sup>
  • B. 2.18 x10<sup>6</sup> ms<sup>-1</sup>
  • C. 2.19 x 10<sup>6</sup> ms<sup>-1</sup>
  • D. 3.18 x10<sup>6</sup> ms<sup>-1</sup>
4 In an electronic transition atom cannot emit.<div></div>
  • A. Infrared radiations
  • B. Visible radiations
  • C. Ultraviolet radiations
  • D. Gama radiations
5 Radius of first Bohr's orbit is.
  • A. 0.053 nm
  • B. 0.053 mm
  • C. 0.053 micro meter
  • D. 0.053 m
6 The series in infrared region is:
  • A. Paschen series
  • B. Bracket series
  • C. Pfund series
  • D. All of above
7 For Paschen series, the value of 'n' starts from
  • A. 2
  • B. 4
  • C. 6
  • D. 8
8 Photons emitted in inner shell transition are.
  • A. Continuous X -rays
  • B. Discontinuous X rays
  • C. Characteristic X rays
  • D. Energetic X rays
9 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
10 _____ has the largest de Broglie wavelength at same speed.
  • A. Proton
  • B. Alpha particle
  • C. Carbon atom
  • D. Electron

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