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 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	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 value of Rydberg constant is	A. 1.0974 x 10⁷ m^-1 B. 1.0974 x 10^-7 m^-1 C. 1.0974 x 10⁶ m^-1 D. 1.0974 x 10^-6 m^-1
4	The process by which lesser beam can be used to generate 3-dimensional images of objects is called	A. Holography B. Geo graphy C. Tomography D. Radio graphy
5	Frequency of x-rays depends upon.	A. Number of electrons striking target B. Accelerating potencial C. Nature of the target D. Both B and C
6	_____ has the largest de Broglie wavelength at same speed.	A. Proton B. Alpha particle C. Carbon atom D. Electron
7	In Helium Neon laser, the discharge tube is filled with	A. 80% He, 20% Neon B. 85% He, 15% Neon C. 83% He, 17% Neon D. 90% He, 10% Neon
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	X-rays were discovered by	A. Curie B. Henry Becquerel C. Rontgen D. None of these
10	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