PPSC Physics Full Book With Answers

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PPSC Physics Full Book

Sr. # Questions Answers Choice
1 The maximum K.E of photo electrons depends upon Energy of incident radation Frequency of incident radiation Wavelength of incident radiation Mass of incident radiation
2 In annitilation of matter, positron and electron pair disappears into two Alpha particles Beta particles Game particles X-rays
3 The converse of pair production is Annihilation of matter Materialization Compton effect Photo electric effect
4 The process of pair production will take place if the energy of photon is greater than 0.21 MeV 0.51 MeV 1.51 MeV 1.21 MeV
5 The process of pair production will take place if the energy of photon is greater than. 0.21 MeV 0.51 MeV 1.51 MeV 1.21 MeV
6 For an electron or position the rest mass energy is equal to. 0.21 MeV 0.51 MeV 1.51 MeV 1.21 MeV
7 X-rays are absorbed maximum by Paper Copper Steel Lead
8 Why hydrogen atom does not emit x-rays. its size is very small It contains only single electron In it energy levels are for apart In it energy levels are close to each other
9 The possible values of principal quantum number are. only zero 0,1,2,...................7 1,2,3........................8 2,3,4,6...............10
10 In scattering experiment which force scatters alpha particle. Nuclear force Coulomb's force Gravitational force Centripetal force
11 During transition, atom cannot emit Visible light Ultraviolet radiation Infrared radiations gama rays
12 The radius of second orbit of hydrogen atom is 0.071 A 0.142 A 4.752 A 9.5298 A
13 The energy in an electromagnetic wave is carried in the units called. Protons Electrons Neutrons Nucleus
14 White light a tungsten filament lamp is passed through sodium vapor and viewed through a diffraction gritting Which of the following best describes the spectrum which would be seen. Coloured lines on a black background Coloured lines on a white background Dark lines on a coloured background Dark lines on a white background
15 The unit of Rydberg constant R is m m3 m<sup>-1</sup> m-2
16 The process of conversation of a photon into an electron and a position is called. Pair annihilations Pair production Photoelectric effect Compton effect
17 The phenomenon of Compton's effect process that right has Wave nature Particle nature Dual nature Corpuscular nature
18 In Compton's effect the change in wavelength of a scattered photon is called. Angle of emergence Angle of refraction Angle of deviation Compton shift
19 The angle of scattering for which the Compton shift is maximum is. 0<sup> o</sup> 45 <sup>o</sup> 80 o 180<sup> o</sup>
20 The phenomenon in which a photon of frequency 'f' is scattered by an electron and the scattered photon has frequency f <f is known as. Pair production Pair annihilations Photoelectric effect Compton's effect
21 In Compton's effect it was considered that X-rays consist of Electrons Holes Neutrons Protons
22 The phenomenon is which the wavelength of scattered X-rays is larger than the incident X-rays is known as. Zeeman's effect Photoelectric effect Compton's effect Annihilation of matter
23 Which one of the following spectra series is in the ultraviolet region. Lyman series Paschen series Brackett series Plund series
24 Which given element has lowest work function Na Al si C
25 The minimum amount of energy in an individual electron has to gain to escape from a particular surface is called. Threshold frequency work function Wave number Kinetic energy
26 The total energy of the hydrogen atom is zero Infinite positive Negative
27 Lines of Balmer series are emitted by hydrogen atom when the electron jumps from The first orbit to any other orbit Higher orbits to second orbit Higher orbits to first orbit The third orbit to higher orbit
28 What will be excitation energy in the third orbit of hydrogen atom. 0.66 eV 0.85 eV 1.5 eV 5.4 eV
29 Which of the following quantities is discrete according to Bohr's hypothesis. Momentum <div>Potential energy</div> Angular velocity Angular momentum
30 The Rutherford atom according to classical theory is Stable Unstable Partially stable Quantized
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