PPSC Physics Full Book With Answers

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PPSC Physics Full Book

Sr. # Questions Answers Choice
1 X-rays used for Cutting boring and precision welding Retina stitching in eye operations Detecting heavy elements under the earth Deflecting flaws in welding and casting
2 When Photon incident on a metal produce the emission of electrons the process is called. Photo electric effect Pair production x-rays production Gama ray production
3 Matter waves Are electromagnetic in nature Travel with the speed of light Can be diffracted Are longitudinal waves
4 Compton scattering experiment seemed to indicate that radiation had Wave nature Particle nature Wave particle nature X-rays nature
5 The maximum K.E. with which photoelectrons are emitted depends very strongly on the. Intensity of incident light Electric field near the photocathode Frequency of incident light Polarization of incident light
6 Which of the following is not an electromagnetic wave. game rays Ultraviolet rays Ultrasonic waves Microwaves
7 Which of the following phenomenon cannot be understood by quantum theory. Photo electric effect Compton effect X-Rays production Interference
8 Work function is generally expressed in. Electron volt Joules Newtons Gauss
9 The strength of photo electric current depends upon. Intensity of incident light Frequency of incident light Angle of incident light Distance between anode and cathode
10 Which of the following propagates at the same speed as velocity of light. Heat waves Sound waves Shock waves <div>Beta particles</div>
11 Mosley's law establishes the X-rays fluorescence of target element with is. Atomic weight Atomic number Density Lattice constant
12 The wavelength of X-rays is of the ofder of. 10<sup>-14</sup> m 10<sup>-10</sup> m 10<sup>-9</sup> m 10<sup>-6</sup> m
13 Though the wavelength of X-rays is smaller than that of visible light yet the speed of X-rays in vacuum is. longer that that of visible light Smaller than that of visible light Same as that of visible light Unpredictable
14 The absorption of X-rays in a given material follows. A parabola path Is straight line An exponential curve A circle
15 The Compton effect in X-rays proves that Electrons have wave property x-rays have wave properly X-rays have particle characteristics Electrons cannot exist
16 X-rays spectrum may be Continuous spectrum Discontinuous spectrum Line spectrum Continuous and line spectrum
17 In which of the following studies x-rays are not helpful. Crystal structure Crystal surface Crystal symmetry Crystal atoms
18 Which of the following properties is not exhibited by X-rays. Interference Diffraction Polarization Deflection of electric field
19 A perfect back body Is a perfect absorber of all radiations Is a perfect reflector of all radiations Is a perfect reflector of visible lights radiations Is a brownish object
20 The maximum energy of emitted photoelectron is measured by the largest potential difference they can traverse The current they produce The potential difference they produce The speed with they emerge
21 The electrons behave as wave because. They can be diffracted by a crystal They can be defecting by magnetic field They can be deflecting by electric field they can produce ions in gases
22 In order to reduce uncertainty in momentum one must use light of. Short wavelength Large wavelength Wavelength of intermediate value Wavelength of any value
23 x-rays cannot produce Photoelectron Compton electron Electron positron pair All of these
24 Which of the following wavelength lies in X-rays region. 1 A 100 A 1,000 A 10,000 A
25 the wavelength of continuous X-rays is inversely proportional to. Intensity of incident electron beam Temperature of the target Intensity of X-rays The energy of electrons striking the target
26 What is the effect of electric and magnetic fields on X-rays X-rays are deflected X-rays are not deflected X-rays are sometimes deflected and sometimes not Nothing can be said
27 X-rays are not used in RADARs because They are not reflected by the target they are not completely absorbed by air They damage the target They are reflected by the target
28 On which factor cut off wavelength of X-rays coming from a Coolidge tube depends upon. Target material Accelerating voltage Filament temperature Separation between target and the filament
29 The X-rays coming from a X-rays tube Is monochromatic Has all wavelengths smaller than a certain maximum wavelength Has all wavelengths greater than a certain maximum wavelength has all wavelengths minimum than a certain maximum wavelength
30 The mass of an helium nucleus is equal to. 2.0015 u 3.0015 u 4.0015 u 5.0015 u
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