ECAT Pre General Science Physics Chapter 20 Atomic Spectra Online Test With Answers

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ECAT Pre General Science Physics Chapter 20 Atomic Spectra 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
16 Static electricity is produced by the transfer of: Electrons Protons One fluid Two fluid None of these
17 The electric field lines start from: Positive charge Negative charge Either A and B Neutron An atom
18 The photocopying process is called: Geography Sonography Xerography Zerography None of these
19 Selenium is: An insulator A conductor Both A and B Excellent conductor None of these
20 The inkjet printer eject a thin stream of: Water Oil Ink Any above None of these
21 If the distance between two charges is doubled,the force between them will become: Double Half One third One fourth
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