12th class Physics chapter 20 online mcq test with answers for ICS part 2 Physics Chapter 20 (Atomic Spectra)

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

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Ics Part 2 Physics Chapter 20 Test

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

Sr. #	Questions	Answers Choice
1	The line radiations emitted from by hydrogen filled discharge tube can be analyzed into.	A. Band spectrum B. Line spectrum C. Continuous spectrum D. Absorption spectrum
2	Which is not true for X rays	A. X rays are not defected by electric field B. X rays are polarized C. X rays consist of electromagnetic waves D. X rays can be diffracted by grating
3	The following gas was identified in the sun using spectroscopy	A. Hydrogen B. Helium C. Carbon D. Nitrogen
4	The longest wavelength of Paschen series is.	A. 656 nm B. 1094 nm C. 1875 nm D. 2000 nm
5	The first orbit in the hydrogen atom has a radius.	A. 0.53 nm B. 0.053 nm C. 0.0053 nm D. 0.00053 nm
6	Laser is a beam of light which is	A. Monochromatic B. Coherent C. Unidirectional D. All of these
7	Life time of metastable states is	A. 10<sup>-6</sup> sec or more B. 10<sup>-3</sup> sec or more C. 10<sup>-5</sup> sec or more D. None of these
8	The shortest wave length is Bracket series has wave length.	A. 16/Rn B. Rn/16 C. 16 Rn D. 4 Rn
9	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
10	If the ionization energy of hydrogen atom is 13.6 eV, its ionization potential will be	A. 136.0 volt B. 3.0 volt C. 13.6 volt D. None of these

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