PPSC Physics Topic 7 Modern Physics With Answers

PPSC Physics Topic 7 Modern Physics

Sr. # Questions Answers Choice
1 X-rays are Longitudinal wave Transvers waves Secondary waves Fast sound waves
2 The term used for the emission of electrons when light strikes a surface. The zeeman effect The photo electric effect Skin effect Compton effect
3 LED is a p-n junction that emits Visible light X- rays Ultraviolet light electromagnetic waves
4 X-ray are Streams of negatively charted particles. Electromagnetic wave Streams of positively charged particles Visible light
5 Mosley's law establishes the x rays fluorescence's of target element with its. Atomic weight Atomic number Density Lattice constant
6 What do we study by crystallography. The analysis of X ray spectra of elements and study of crystal structure. Visible spectra of sources and crystal study Ultraviolet spectra of sources and crystal study Characteristics of X-rays
7 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
8 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
9 Matter waves Are electromagnetic in nature Travel with the speed of light Can be diffracted Are longitudinal waves
10 Compton scattering experiment seemed to indicate that radiation had Wave nature Particle nature Wave particle nature X-rays nature
11 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
12 Which of the following is not an electromagnetic wave. game rays Ultraviolet rays Ultrasonic waves Microwaves
13 Which of the following phenomenon cannot be understood by quantum theory. Photo electric effect Compton effect X-Rays production Interference
14 Work function is generally expressed in. Electron volt Joules Newtons Gauss
15 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
16 Which of the following propagates at the same speed as velocity of light. Heat waves Sound waves Shock waves <div>Beta particles</div>
17 Mosley's law establishes the X-rays fluorescence of target element with is. Atomic weight Atomic number Density Lattice constant
18 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
19 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
20 The absorption of X-rays in a given material follows. A parabola path Is straight line An exponential curve A circle
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