12th Class Physics Chapter 20 MCQs with Answers

AdminFebruary 16, 2024

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Welcome to the 12th Class Physics Chapter 20 MCQs Practice and Quiz Tests. We are presenting you with top MCQ questions from the 12th Class Physics Chapter 20 Atomic Spectra.

You can find all the 12th Class Physics Chapter 20 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 20 with Answers Free PDF

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Grade 12 Physics Chapter 20 Online Quiz

By presenting 3 options to choose from, 12th Class Chapter 20 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 20 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.

1th Class Physics Ch 20: Atomic Spectra

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1 / 40

Who discovered the quantization of angular momentum in 1925?

Max Planck

Louis de Broglie

Werner Heisenberg

2 / 40

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

Photoelectric effect

Doppler effect

Compton effect

3 / 40

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

Quantum mechanics

Spectroscopy

Thermodynamics

4 / 40

Who discovered the quantization of angular momentum in 1925?

Max Planck

Werner Heisenberg

Louis de Broglie

5 / 40

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

Photoelectric effect

Compton effect

Heisenberg uncertainty principle

6 / 40

What is the term for the emission of light by a substance after it has absorbed electromagnetic radiation?

Phosphorescence

Luminescence

Fluorescence

7 / 40

Who discovered the quantization of electric charge in 1909?

J.J. Thomson

Ernest Rutherford

Robert Millikan

8 / 40

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

Photons

Electrons

Quanta

9 / 40

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

Doppler effect

Compton effect

Photoelectric effect

10 / 40

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

Doppler effect

Compton effect

Photoelectric effect

11 / 40

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

Heisenberg uncertainty principle

Photoelectric effect

Compton effect

12 / 40

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

Absorption spectrum

Continuous spectrum

Emission spectrum

13 / 40

What is the term for the emission of light by atoms or molecules when excited by an external source?

Luminescence

Fluorescence

Phosphorescence

14 / 40

What is the term for the emission of light by a substance after it has absorbed energy and re-emits it as visible light?

Fluorescence

Phosphorescence

Luminescence

15 / 40

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

Luminescence

Fluorescence

Phosphorescence

16 / 40

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

Quantum mechanics

Spectroscopy

Thermodynamics

17 / 40

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

Wave-particle duality

Photoelectric effect

Compton effect

18 / 40

Who discovered the quantization of light energy in 1900?

Albert Einstein

Max Planck

Niels Bohr

19 / 40

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

Compton effect

Photoelectric effect

Doppler effect

20 / 40

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

Compton effect

Photoelectric effect

Doppler effect

21 / 40

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

Compton effect

Doppler effect

Photoelectric effect

22 / 40

What is the term for the emission of light by a substance after it has absorbed energy and re-emits it as visible light?

Fluorescence

Phosphorescence

Luminescence

23 / 40

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

Fluorescence

Phosphorescence

Luminescence

24 / 40

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

Quanta

Photons

Electrons

25 / 40

What is the term for the emission of light by atoms or molecules when excited by an external source?

Luminescence

Phosphorescence

Fluorescence

26 / 40

Who discovered the quantization of light energy in 1900?

Max Planck

Niels Bohr

Albert Einstein

27 / 40

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

Albert Einstein

Niels Bohr

Max Planck

28 / 40

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

Spectroscopy

Thermodynamics

Quantum mechanics

29 / 40

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

Continuous spectrum

Absorption spectrum

Emission spectrum

30 / 40

What is the term for the emission of light by atoms or molecules when excited by an external source?

Fluorescence

Phosphorescence

Luminescence

31 / 40

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

Niels Bohr

Max Planck

Albert Einstein

32 / 40

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

Phosphorescence

Fluorescence

Luminescence

33 / 40

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

Albert Einstein

Niels Bohr

Max Planck

34 / 40

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

Quanta

Electrons

Photons

35 / 40

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

Photoelectric effect

Heisenberg uncertainty principle

Compton effect

36 / 40

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

Fluorescence

Phosphorescence

Luminescence

37 / 40

Who discovered the quantization of electric charge in 1909?

Robert Millikan

Ernest Rutherford

J.J. Thomson

38 / 40

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

Doppler effect

Photoelectric effect

Compton effect

39 / 40

What is the term for the emission of light by a substance after it has absorbed electromagnetic radiation?

Luminescence

Fluorescence

Phosphorescence

40 / 40

Who discovered the quantization of electric charge in 1909?

Ernest Rutherford

Robert Millikan

J.J. Thomson

Download Certificate of Quiz 12th Class Chapter 20

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AdminFebruary 16, 2024

0 7 1 minute read