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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 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
2 For Paschen series, the value of 'n' starts from
  • A. 2
  • B. 4
  • C. 6
  • D. 8
3 The value of Rydberg constant is
  • A. 1.0974 x 10<sup>7</sup> m<sup>-1</sup>
  • B. 1.0974 x 10<sup>-7</sup> m<sup>-1</sup>
  • C. 1.0974 x 10<sup>6</sup> m<sup>-1</sup>
  • D. 1.0974 x 10<sup>-6</sup> m<sup>-1</sup>
4 Balmer Empirical formula explains the electromagnetic radiation of any excited atom in terms of their.
  • A. Energy
  • B. Mass
  • C. Wave length
  • D. Momentum
5 The shortest wave length is Bracket series has wave length.
  • A. 16/Rn
  • B. Rn/16
  • C. 16 Rn
  • D. 4 Rn
6 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
7 A° is the unit of:
  • A. Energy
  • B. Length
  • C. Nuclear energy
  • D. Work
8 Production of x rays is reverse process of
  • A. Photo electric effect
  • B. Compton effect
  • C. An nihilation
  • D. Pair production
9 Helium-Neon laser discharge tube contains neon
  • A. 82%
  • B. 15%
  • C. 25%
  • D. 85%
10 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

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