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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 Who explained the photo electric effect.
  • A. Max Plank
  • B. Einstein
  • C. Henry
  • D. Rutherford
2 If the kinetic energy of a free electron doubles, its de Broglie wavelength changes by the factor.
  • A. <b style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 16px;">√</b><span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 16px;">2</span>
  • B. 1/<b style="font-family: arial, sans-serif; font-size: 16px; color: rgb(34, 34, 34);">√</b><span style="font-family: arial, sans-serif; font-size: 16px; color: rgb(34, 34, 34);">2</span>
  • C. 2
  • D. 1/2
3 In the equation if f<sub>2</sub> &gt; then
  • A.
  • B.
  • C.
  • D.
4 In an nihilation emitted photons moves in opposite directions to conserve.
  • A. Mass
  • B. Charge
  • C. Energy
  • D. Momentum
5 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
6 A perfect absorber must also be perfect
  • A. Cavity
  • B. Sources of radiation
  • C. Radiator
  • D. None of these
7 The energy of photon is givne by
  • A. mv2/2
  • B. hf
  • C. Va e
  • D. mac<sup>1</sup>
8 The unit of work function is
  • A. Electron volt
  • B. Ampere
  • C. Volt cell
  • D. Hz
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 Joule second is the unit of.
  • A. Energy
  • B. Wein's constant
  • C. Planck's constant
  • D. Boyle's law

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