class 12 physics chapter 20 Important Questions

Learn  Class 12 Physics Chapter 20 Atomic Spectra Important Questions. These important physics Class 12 mcqs, short and long questions are collected by going through different past papers of all Punjab Board Pakistan.

Why are these questions important?

These Questions are taken from past papers of Class 12 Physics. These questions are top repeated of in previous papers of Physics Class 12 of all Punjab boards as;

      Bahawalpur Board

      D.G.Khan Board

      Faisalabad Board

      Gujranwala Board

      Lahore Board

      Multan Board

      Rawalpindi Board

Content is created and designed with intense care and diligence. Here is only the most important MCQ, short questions and long questions of Class 12 Physics Chapter 20 Atomic Spectra.

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You can easily download in pdf format or view Physics Class 12 mcqs, short questions and long questions  online. You can easily print these files in simple way. Here you find Class 12 Physics Chapter 20 Atomic Spectra important mcqs, short and long questions. By Preparing these important questions, you will achieve splendid marks in Physics Class 12. This content is very helpful for weak students and also helpful for those students that are better at Class 12 Physics exam preparation. These Questions are based on the current Physics Class 12 syllabus according to Punjab Textbook Board.

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About This Chapter

Class 12 Physics Chapter 20 Atomic Spectra enables the students to learn Atomic Spectra and Bohr's model of the hydrogen atom. Students learn Inner Shell Transitions and Characteristic X-Rays. Students learn Uncertainty Within the Atom. Students learn about laser, helium neon laser and uses of laser in medicine and industry. This Post "class 12 physics chapter 20 Important Questions" covers all important mcqs, short and long questions related to important  topics of this chapter.

👉Imp MCQs - Physics Class 12 CH # 20

1. Atom can reside in metastable state for:

(A) 10^-1 second

(B) 10^-2 second

(C) 10^-3 second

(D) 10^-4 second

(C) 10-3 second

2. Type of rays used in holography are:

(A) Laser

(B) X-rays

(C) 𝜸-rays

(D) Alpha rays

(A) Laser

3. The production of x-rays can be considered as the reverse of :   

(A) Photoelectric effect

(B) Compton effect

(C) Pair production

(D) None of these

(A) Photoelectric effect

4. The value of Rydberg’s constant is :
    

(A) 1.09 × 10^-3m^-1

(B) 1.09 × 10⁸m^-1

(C) 1.09 × 10⁶m^-1

(D) 1.09 × 10^-8m-1

(B) 1.09 × 10⁸m^-1

5. Hydrogen spectrum does not lie in:

(A) X-rays region

(B) Visible region

(C) UV region

(D) Both A & B

(A) X-rays region

6. The Balmer series lies in which region of electromagnetic spectrum of hydrogen:

(A) Visible

(B) Ultraviolet

(C) Infra red

(D) Far ultra violet

(A) Visible

7. The value of radius of 1st Bohr’s orbit is:

(A) 0.0053 nm

(B) 0.059 nm

(C) 0.0050 nm

(D) 0.58 nm

(A) 0.0053 nm

8. Atomic spectra are the examples of ? 

(A) Continuous spectra

(B) Line spectra

(C) Mix spectra

(D) Both A & C

(B) Line spectra

9.  X-rays have the following characteristics: 

(A) Reflection 

(B) Polarization

(C) Diffraction

(D) All of above

(D) All of above

10.  Which is not Characteristics of  LASER?

(A) Multidirectional

(B) Coherent

(C) Mono coherent

(D) Intense

(A) Multidirectional

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👉Other Chapters (PDF) of Class 12 Physics Punjab Textbook Board

✅Chapter 12

Electrostatics

✅Chapter 13

Current Electricity

✅Chapter 14

Electromagnetism

✅Chapter 15

Electromagnetic Induction

✅Chapter 16

Alternating Current

✅Chapter 17

Physics of Solids

✅Chapter 18

Electronics

✅Chapter 19

Dawn of Modern Physics

✅Chapter 21

Nuclear Physics