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19th Chapter

12th Class Physics Chapter 19 Test

Here you can prepare 12th Class Physics Chapter 19 Dawn of Modern Physics Test. Click the button for 100% free full practice test.

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

Ics Part 2 Physics Chapter 19 Test
ic

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

Sr. # Questions Answers Choice
1 The concept of direction is purely
  • A. Relative
  • B. Absolute
  • C. Relative to the motion
  • D. None of these
2 The photoelectric effect predicts that light is made of
  • A. Photons
  • B. Neutrons
  • C. Protons
  • D. None of these
3 Light of 4.5 eV is incident on a Cesium surface and stopping potential is 0.25 eV, maximum K.E. of emitted electron is.
  • A. 4.5 eV
  • B. 4.25 eV
  • C. 4.75 eV
  • D. 0.25 eV
4 Platinum wire becomes yellow at a temperature of.
  • A. 900<sup> o</sup>C
  • B. 1300<sup>o</sup>C
  • C. 1600<sup>o</sup>C
  • D. 500<sup>o</sup>C
5 A positron is an anti particle of.
  • A. Proton
  • B. Electron
  • C. Neutron
  • D. Photon
6 The dimensions of Plank's constant is same as that of.
  • A. Energy
  • B. Power
  • C. Acceleration
  • D. Angular momentum
7 The minimum frequency needed to emit an electron form metal surface is called:
  • A. Work function
  • B. Threshold frequency
  • C. Quanta frequency
  • D. All of above
8 The minimum energy required for occurrence of pair production is:
  • A. 1.022eV
  • B. 1.02keV
  • C. 1.02Me.V
  • D. 1.04MeV
9 The mass of an object will be doubled at speed.
  • A. 2.6 x 10<sup>8</sup> m/s
  • B. 1.6 x 10<sup>8 </sup>m/s
  • C. 2.6 x 10<sup>7 </sup>m/s
  • D. 3.6 x 10<sup>7</sup> m/s
10 If the energy of photon is 10 eV and work function is 5 eV, then the a value of stopping potential will be
  • A. 50 V
  • B. 2 V
  • C. 5 V
  • D. 15 V

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