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

ECAT Physics Chapter 19 Dawn of Modern 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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