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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 Earth orbital speed is
  • A. 10 km/s
  • B. 20 km/s
  • C. 30 km/s
  • D. 40 km/s
2 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>
3 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
4 If electron jumps from second orbit to first orbit in hydrogen atom it emits photon of.
  • A. 3.40 eV
  • B. 10.20 eV
  • C. 13.6 eV
  • D. 3.8 eV
5 The series in visible region is:
  • A. Balmer series
  • B. Pfund series
  • C. Paschen series
  • D. None of above
6 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
7 Bremsstrahlung radiation are examples of
  • A. Atomic spectra
  • B. Molecular spectra
  • C. Continuous spectra
  • D. Discrete spectra
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 In Helium Neon laser, the discharge tube is filled with
  • A. 80% He, 20% Neon
  • B. 85% He, 15% Neon
  • C. 83% He, 17% Neon
  • D. 90% He, 10% Neon
10 Helium Neon Laser Beam emitted from discharge tube has a colour.
  • A. Blue
  • B. Green
  • C. Red
  • D. Black

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