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12th Class Physics Chapter 19 Test

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2nd Year Physics Chapter 19 Online MCQ Test for 12th Class Physics Chapter 19 (Dawn of Modern Physics)

This online test contains MCQs about following topics:

- Relative Motion
- Frames of Reference
- Special Theory of Relativity
- Black Body Radiation
- Interaction of Electromagnetic Radiation With Matter
- Annihilation of Matter
- Wave Nature of Particles
- Uncertainty Principle

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Ics Part 2 Physics Chapter 19 Test
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2nd Year Physics Chapter 19 Online MCQ Test for 12th Class Physics Chapter 19 (Dawn of Modern Physics)

Sr. # Questions Answers Choice
1 When platinum wire is heated, it changes to cherry red at temperature.
  • A. 500<sup>o</sup>C
  • B. 900<sup>o</sup>C
  • C. 1100<sup>o</sup>C
  • D. 1300<sup>o</sup>C
2 Who explained the photo electric effect.
  • A. Max Plank
  • B. Einstein
  • C. Henry
  • D. Rutherford
3 The value of Stefan is constant is:
  • A. 4.57 x 10<sup>-8</sup> m<sup>2</sup>k<sup>2</sup>
  • B. 5.67 x10<sup>-8</sup> wm<sup>-2</sup>k<sup>-4</sup>
  • C. 6.67x 10<sup>-11</sup> wm<sup>2</sup>k<sup>4</sup>
  • D. 7.45 x &nbsp;10<sup>-9</sup> m<sup>2</sup> wk<sup>3</sup>
4 Which is the most refined form of matter.
  • A. Smoke
  • B. Fog
  • C. Light
  • D. Electron
5 The physical quantity related to photon, that does not change in Compton scattering is.
  • A. Energy
  • B. Speed
  • C. Frequency
  • D. Wavelength
6 Eintein's Photoelectric equation is E<sub>k</sub>= hf -∅ in this equation E<sub>1</sub>, refers to:
  • A. K.E of al the emited electrons
  • B. Mean K.E of emited electrons
  • C. Maximum K.E of emited electrons
  • D. Minimum K.E of emited electrons
7 The most refined form of matter is:
  • A. Smoke
  • B. Light
  • C. Ice
  • D. Fog
8 When platinum is it becomes orange at
  • A. 500<sup>o</sup>C
  • B. 900<sup>o</sup>C
  • C. 1100<sup>o</sup>C
  • D. 1300<sup>o</sup>C
9 The principle regarding the dual nature of light was first discovered by
  • A. Compton
  • B. J.J.Thomson
  • C. De-Broglie
  • D. Heisenberg
10 Potassium Cathodes in photocell emit electrons for a light.
  • A. Visible
  • B. Infra red
  • C. Ultra violet
  • D. X rays

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