Physics ECAT Pre Engineering MCQ's Test For Full Book With Answers

Physics ECAT Pre Engineering MCQ's Test For Full Book

Sr. # Questions Answers Choice
1 X-rays can penetrate in a solid matte through a distance of several: Kilo metres Metres Centimeters A few angstroms One micrometer
2 In case of braking radiations, when the rate of deceleration is very large, the emitted radiation corresponds to: Short wavelength Large wavelength Very large wavelenth Low frequency Both (B) and (C)
3 Braking radiation causes: Continuous spectrum Line Spectrum Band spectrum Discrete specturm All of these
4 The holes created in the L and M shells are occupied by transitions of: Electrons from lower states Electrons from higher state Positrons from higher states Electrons from K shell Both (A) and (B)
5 The transitions of electrons in the hydrogen atom result in the emission of spectral lies in the: Ultra red region Visible region Ultraviolet region Any of these None of these
6 Energy required by an electron revolving in certain orbit to jump to an excited state is called: Ionization energy Ionization potential Excitation energy Excitation potential None of these
7 An electron of the hydrogen atom in the second orbit is called its: Ground state Excited state Ionized state Any of these None of these
8 The formula of Brackett series can be obtained by putting in the general formula, the value of n equal to: <div>one</div> two three four five
9 Lyman series in the spectrum of hydrogen exists in the : Infra-red region Visible region Ultraviolet region Both(A) and (B) None of these
10 Tick the series which lie/s in. the infra-red region. Pfund series Brackett series Paschen series All of these None of these
11 Tick the series which lies in the visible region: Lyman series Balmer series Paschen series Brackett series P fund series
12 Spectrum represents the number of component colours present in certain light in terms of: Wavelength Frequency Energy Both (A) and (B) All of these
13 The process of formation of spectrum is called: Interference Spectroscopy Dispersion Reflection Botha (A) and (D)
14 The results of spectra obtained by Balmer were expressed in 1896 by: <div>Bohr</div> Rydberg Planck Rutherford Coulomb
15 The natural arrangement of colours in the spectrum of white light spectrum is VIBGYOR ROYBGIV ROYBIGV BIGROYV None of these
16 Balmer series lies in that region of electromagnetic wave spectrum which is called: Visible region Invisible region Infra-red region ultraviolet region None of these
17 Balmer series was identified in: 1685 1785 1885 1985 1585
18 The first series which was identified in the spectrum of hydrogen is called: Lyman series Balmer series Paschen series Brackett series Pfund series
19 The positron was discovered by: In cosmic radiation In 1932 By Carl Anderson All above By direc
20 A particle having mass and charge equal to that of an electron is called: Proton Positron Pion Pi-meson Both (C) and (D)
21 Photoelectric effect takes place with a photon of: Very high energy Very low energy Low energy High energy None of these
22 Compton shift refers to: Photon Meson Proton Positron Both (B) and (D)
23 The year when A.H. compton was awarded Nobel Prize is: 1923 1927 1931 1935 None of these
24 Compton derived an expression to find compton shift by applying to the process, the law of conservation of: Energy only Momentum only Mass only Charge only Both (A) and (B)
25 Compton studied the scattering of x-rays by loosely bound electrons from: NaCl crystal Graphite crystal Zirconia Copper crystal None of these
26 The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be 500 m 500 nm 500 km 500 cm None of these
27 The unit of work function is: Joule Electron volt That of threshold frequency Both (A) and (B) None of these
28 Photoelectrons are emitted when ultraviolet light falls on: Casium Silver Potassium Any of these None of these
29 The Nobel Prize on the explanation of photoelectric effect was awarded to: Max. Planck Maxwell Bohr Rutherford None of these
30 The idea of quantization of energy was proposed by: Einstein Max.Planck Maxwell Bohr Rutherford
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