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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 Pair production cannto take place in vacuum because :
  • A. Mass in not conserved
  • B. Momentum is not conserved
  • C. Energy is not conserved
  • D. Charge is not conserved
2 Energy of Black body radiation depends upon
  • A. Nature of surface of body
  • B. Nature of material of body
  • C. Shape and size of body
  • D. Temperature of the body
3 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
4 In an nihilation emitted photons moves in opposite directions to conserve.
  • A. Mass
  • B. Charge
  • C. Energy
  • D. Momentum
5 When a very high energy modeules such as y radiation interact with matter, the phenomenon arising will be.
  • A. Photoelectric effect
  • B. Compton effect
  • C. Pair production
  • D. Annihilation of matter
6 Pair production occurs only when energy of photon is at least equal in:
  • A. 1.02keV
  • B. 1.02 eV
  • C. 1.02 MeV
  • D. 1.02 GeV
7 An electron miroscope emplys which to one of the following particles?
  • A. Electron ahve a wave nature
  • B. Electrons can be focused by an electric field
  • C. Electrons can be focused by a magnetic field
  • D. All of the above
8 Earth orbital speed is.
  • A. 10 km/s
  • B. 20 km/s
  • C. 30 km/s
  • D. 40 km/s
9 In Compton scatting, the value of shift is equal to Compton's wavelength, when X-rays is scattered at the angle of.
  • A. 90<sup>o</sup>C
  • B. Zero
  • C. 120<sup>o</sup>C
  • D. 45<sup>o</sup>C
10 Which one of the following paved the way for modern physics
  • A. Newtonian mechanics
  • B. Theory of relativity
  • C. Quantum theory
  • D. All of above

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