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

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Sr.#	Question	Answer
1	The following gas was identified in the sun using spectroscopy	A. Hydrogen B. Helium C. Carbon D. Nitrogen
2	An atom can reside in excited state for	A. 10^-8 second B. One second C. 10^-10 second D. More than one second
3	The radius of 10th orbit in hydrogen atom is.	A. 0.053 nm B. 0.53 nm C. 5.3 nm D. 53 nm
4	The longest wavelength of Paschen series is.	A. 656 nm B. 1094 nm C. 1875 nm D. 2000 nm
5	The typical nuclei are less than:	A. 10^-16m B. 10^-14m C. 10^-12m D. 10^-10m
6	1 rem =	A. 0.001 SV B. 0.01 SV C. 0.1 SV D. 1.01 SV
7	Helium-Neon laser discharge tube contains neon	A. 82% B. 15% C. 25% D. 85%
8	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
9	Laser can be made by creating.	A. Meta stable B. Population inversion C. Excited state D. All of these
10	The first theory about the structure of an atom was introduced by	A. Neil Bohr B. Einstein C. Compton D. Rutherford