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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
ic

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

Sr. # Questions Answers Choice
1 Black Body radiation spectrum is an example of:
  • A. Atomic spectra
  • B. Line spectra
  • C. Continuous spectra
  • D. None of above
2 Target material used in x-rays tube have following properties.
  • A. High atomic number and high melting pouint
  • B. High atomic number and low melting pouint
  • C. Low atomic number and low melting pouint
  • D. High atomic number only
3 In an electronic transition atom cannot emit.<div></div>
  • A. Infrared radiations
  • B. Visible radiations
  • C. Ultraviolet radiations
  • D. Gama radiations
4 The temperature of core of nuclear reactor is:
  • A. 1100°C
  • B. 1200°C
  • C. 1300°C
  • D. 1400°C
5 X-rays were discovered by
  • A. Curie
  • B. Henry Becquerel
  • C. Rontgen
  • D. None of these
6 In according with Bohr's theory the K.E of the electron is equal to:
  • A. ke<sup>2</sup>/2r
  • B. Ze<sup>2</sup>/r
  • C. Ze<sup>2</sup>/r<sup>2</sup>
  • D. Ze<sup>2</sup>/2r<sup>2</sup>
7 For an atom of hydrogen atom the radius of the first orbit is given by:
  • A. H/me<sup>2</sup>
  • B. me/4h<sup>2</sup>
  • C. h2/4<span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 16px;">π<sup>2</sup> kme<sup style="">2</sup></span>
  • D. h<sup>2</sup> me<sup>2</sup>
8 Electron volt is unit of:
  • A. Chemical energy
  • B. Potential energy
  • C. Nuclear energy
  • D. heat energy
9 The first spectral lines were discovered in 1885, were
  • A. Paschen series
  • B. Balmer series&nbsp;
  • C. Pfund series
  • D. Bracket series
10 The velocity of electron moving is 1st orbit of hydrogen atom is:
  • A. 2.09 x 10<sup>6</sup> ms<sup>-1&nbsp;</sup>
  • B. 2.18 x10<sup>6</sup> ms<sup>-1</sup>
  • C. 2.19 x 10<sup>6</sup> ms<sup>-1</sup>
  • D. 3.18 x10<sup>6</sup> ms<sup>-1</sup>

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