ECAT Pre Engineering Physics Chapter 19 online mcq test with answers for chapter 19 (Dawn of Modern Physics)

Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics Physics Online Test

Sr. #	Questions	Answers Choice
1	The positron was discovered by:	In cosmic radiation In 1932 By Carl Anderson All above By direc
2	A particle having mass and charge equal to that of an electron is called:	Proton Positron Pion Pi-meson Both (C) and (D)
3	Photoelectric effect takes place with a photon of:	Very high energy Very low energy Low energy High energy None of these
4	Compton shift refers to:	Photon Meson Proton Positron Both (B) and (D)
5	The year when A.H. compton was awarded Nobel Prize is:	1923 1927 1931 1935 None of these
6	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)
7	Compton studied the scattering of x-rays by loosely bound electrons from:	NaCl crystal Graphite crystal Zirconia Copper crystal None of these
8	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
9	The unit of work function is:	Joule Electron volt That of threshold frequency Both (A) and (B) None of these
10	Photoelectrons are emitted when ultraviolet light falls on:	Casium Silver Potassium Any of these None of these
11	The Nobel Prize on the explanation of photoelectric effect was awarded to:	Max. Planck Maxwell Bohr Rutherford None of these
12	The idea of quantization of energy was proposed by:	Einstein Max.Planck Maxwell Bohr Rutherford
13	Intensity of light determines the:	Energy of each photon Number of photons Speed of photons Size of photons None of these
14	Electromagnetic -radiation means:	Photons protons Electrons Mesons None of these
15	The way through which electromagnetic radiations or photons interact with matter depends upon their:	Wavelength Frequency Energy Temperature All of these

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