ECAT Pre Engineering Physics Chapter 20 online mcq test with answers for chapter 20 (Atomic Spectra)

Physics ECAT Pre Engineering Chapter 20 Atomic Spectra Physics Online Test

Sr. #	Questions	Answers Choice
1	X-rays produced in a tube operating at 10⁵V. The speed of X-rays produced is	3 x 10<sup>8</sup>m/s 3.1 x 10<sup>8</sup>m/s 2.8 x 10<sup>8</sup>m/s 1.88 x 10<sup>8</sup>m/s
2	In helium Neon Laser Neon = 15% and Helium = 85% used. The lasing gas this unit is	Helium Neon Both None of these
3	The value of the metastable state for Neon is	20.66eV 20.61eV 19.23eV 18.70eV
4	In flesh, light element like carbon, hydrogen and oxygen predominate. Three elements allows ______ amount of incident X-ray to pass through them	Small Greater Equal Sometimes
5	X-ray are also known as	Roentgen rays Maxwell rays Plank range Einstein rays
6	The minimum wavelength of X-rays produced of 1KV potential difference is applied across the anode and cathode of the tube is	1.24 x 10<sup>-10</sup>m 7.92 x 10<sup>-20</sup>m 2.78 x 10<sup>-14</sup>m 3.88 x 10<sup>-11</sup>m
7	CT scanning is the abbreviated name of	Computed Technology Computed Technique Computed Technology Computerized Technique
8	The first shell near the neucles is	L-shell X-shell N-shell M-shell
9	The life time of metastable state is equal to	Life time of excited state Greater than by excited state Zero Less than by excited state
10	We can excite an atom by	Bombardment of particles Radiating photons Providing potential difference All answer are true
11	Ultraviolet region lies in ______ series	Layman Balmer P fund B racket
12	Graph of Black body radiation is example of	Band spectra Continuo's spectra Line spectra All
13	Photons must have energy equal to	ev En hf None of these
14	Gaussian surface is always:	Rectangular Spherical Cylinder Box shape Any of these
15	Coulomb multiplied by volt by volt gives the unit called:	farad Ohm Second joule Watt

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