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20th Chapter

### 12th Class Physics Chapter 20 Test

Here you can prepare 12th Class Physics Chapter 20 Atomic Spectra Test. Click the button for 100% free full practice test.

## 2nd Year Physics Chapter 20 Online MCQ Test for 12th Class Physics Chapter 20 (Atomic Spectra)

This online test contains MCQs about following topics:

- Atomic Spectra
- Bohr's Model of the Hydrogen Atom
- Inner Shell Transitions and Characteristic X-Rays
- Uncertainty Within the Atom
- Laser

Ics Part 2 Physics Chapter 20 Test

### 2nd Year Physics Chapter 20 Online MCQ Test for 12th Class Physics Chapter 20 (Atomic Spectra)

1 When meta I is heated sufficiently electrons are given off by the metal. This phenomenon is known as.
• A. Photoelectric effect
• B. Piezo electric effect
• C. Thermionic emission
• D. Secondary emission
2 For Paschen series, the value of 'n' starts from
• A. 2
• B. 4
• C. 6
• D. 8
3 The value of Rydberg constant is
• A. 1.0974 x 10<sup>7</sup> m<sup>-1</sup>
• B. 1.0974 x 10<sup>-7</sup> m<sup>-1</sup>
• C. 1.0974 x 10<sup>6</sup> m<sup>-1</sup>
• D. 1.0974 x 10<sup>-6</sup> m<sup>-1</sup>
4 Balmer Empirical formula explains the electromagnetic radiation of any excited atom in terms of their.
• A. Energy
• B. Mass
• C. Wave length
• D. Momentum
5 The shortest wave length is Bracket series has wave length.
• A. 16/Rn
• B. Rn/16
• C. 16 Rn
• D. 4 Rn
6 An electron in H -atom is excited from ground state n=4 , How many spectral lines are possible in this case.
• A. 6
• B. 5
• C. 4
• D. 3
7 A° is the unit of:
• A. Energy
• B. Length
• C. Nuclear energy
• D. Work
8 Production of x rays is reverse process of
• A. Photo electric effect
• B. Compton effect
• C. An nihilation
• D. Pair production
9 Helium-Neon laser discharge tube contains neon
• A. 82%
• B. 15%
• C. 25%
• D. 85%
10 The Balmer series is obtained when all the transition of electrons terminate on
• A. 1<sup>st</sup> orbit
• B. 2nd orbit
• C. 3rd orbit
• D. 4th orbit

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