12th Class MCQs

12th Class Physics Chapter 19 MCQs with Answers

Welcome to the 12th Class Physics Chapter 19 MCQs Practice and Quiz Tests. We are presenting you with top MCQ questions from the 12th Class Physics Chapter 19 Dawn of Modern Physics.

You can find all the 12th Class Physics Chapter 19 MCQs online tests on our website. These online tests are great for learning and as well as for scoring maximum marks in your Intermediate Exams. We are making these Class 11 Physics MCQs online tests for those who want full marks in their exams.

12th Class Multiple Choice Question Chapter 19 with Answers Free PDF

You can also download 12th Class Questions with Answers Chapter 19 free PDF from the link provided below. To Download file in PDF click on the arrow sign at the top right corner.

Grade 12 Physics Chapter 19 Online Quiz

By presenting 3 options to choose from, 12th Class Chapter 19 Quiz which cover a wide range of topics and levels of difficulty, making them adaptable to various learning objectives and preferences. You will have to read all the given answers of 12th Class Questions and Answers and click over the correct answer.

  • Test Name: 12th Class Chapter 19 Quiz Practice
  • Type: Quiz Test
  • Total Questions: 40
  • Total Marks: 40
  • Time: 40 minutes

Note: Answer of the questions will change randomly each time you start the test. Practice each quiz test at least 3 times if you want to secure high marks. Once you are finished, click the View Results button. If any answer looks wrong to you in Quizzes. simply comment below this post, so that we can update the answer in the quiz section.

12th Class Physics Chapter 19 MCQs

1th Class Physics Ch 19: Dawn of Modern Physics

Please fill out the form before starting Quiz.

1 / 40

What is the phenomenon where electrons are emitted from a material when light of certain frequencies shines on it?

2 / 40

Who developed the mathematical formalism of quantum mechanics in 1925?

3 / 40

Who introduced the concept of quantization of energy in 1900?

4 / 40

What is the term for the phenomenon where a moving source of waves changes the observed frequency of the waves?

5 / 40

Who discovered X-rays in 1895?

6 / 40

Who formulated the theory of relativity in 1905?

7 / 40

Who discovered the photoelectric effect?

8 / 40

What is the term for the process where a substance absorbs light energy and re-emits it as visible light?

9 / 40

Who discovered the concept of wave-particle duality in 1905?

10 / 40

Who proposed the concept of wave-particle duality of light in 1924?

11 / 40

Who discovered the wave nature of matter in 1927?

12 / 40

What is the term for the phenomenon where light behaves as both a wave and a particle?

13 / 40

Who developed the theory of general relativity in 1915?

14 / 40

Who discovered the quantization of angular momentum in 1925?

15 / 40

Who discovered the nucleus of the atom in 1911?

16 / 40

Who proposed the concept of quantized energy levels for electrons in atoms in 1913?

17 / 40

What is the unit of energy equivalent to one electron volt?

18 / 40

Who discovered the quantization of electric charge in 1909?

19 / 40

What is the phenomenon where charged particles are deflected by a magnetic field, allowing their mass-to-charge ratio to be determined?

20 / 40

What is the term for the quantized units of electromagnetic radiation?

21 / 40

Who proposed the concept of quantized energy levels in blackbody radiation in 1900?

22 / 40

What is the process of measuring both the position and momentum of a particle simultaneously to a high degree of precision impossible?

23 / 40

What is the study of the behavior of matter and light on the atomic and subatomic scale called?

24 / 40

What is the term for the effect where the wavelength of X-rays changes when scattered by electrons?

25 / 40

Who proposed the concept of quantized orbits for electrons in atoms in 1913?

26 / 40

Who developed the uncertainty principle in 1927?

27 / 40

What is the phenomenon where light is scattered by charged particles?

28 / 40

Who developed the mathematical formulation of special relativity in 1905?

29 / 40

What is the name of the equation that describes the behavior of matter and energy on the atomic scale?

30 / 40

What is the term for the process where an electron jumps from a higher energy level to a lower one, emitting a photon?

31 / 40

What is the term for the study of atomic and molecular interactions with electromagnetic radiation?

32 / 40

What is the term for the minimum amount of energy that can be gained or lost by an atom?

33 / 40

What is the smallest unit of light called?

34 / 40

What is the term for the emission of light by atoms or molecules excited to higher energy levels?

35 / 40

What is the term for the emission of light by a substance after it has been excited by external energy?

36 / 40

Who discovered the quantization of energy levels in atoms in 1913?

37 / 40

Who discovered the quantization of light energy in 1900?

38 / 40

Who developed the theory of special relativity in 1905?

39 / 40

What is the principle that matter and energy are interchangeable, represented by the equation E=mc^2?

40 / 40

Who proposed the Bohr model of the atom in 1913?

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