PPSC Physics Topic 7 Modern Physics With Answers

PPSC Physics Topic 7 Modern Physics

Sr. # Questions Answers Choice
1 The change in wavelength of an X-ray when scattered from an electron is called. Compton shift Doppler shift Stefan's law Fraunhofer lines
2 The electrons behave as waves, because they can . Produce ions in gases Diffracted by a crystal Be deflected by electric fields Be deflected by magnetic fields
3 In radiotherapy X-rays are used to. Treat cancer Delect bone fracture Cure heart diseasee All of the above
4 Which of the following phenomenon is observed in obtaining an X ray photograph of our hand. Photoelectric effect Zeeman effect Shadow photography Ionization
5 When objects placed in a room are exposed to X- rays they appear Violet Visible Red Invisible
6 Which one of the following has the largest wavelength. x rays Infrared rays Visible light Radio waves
7 X-rays are also used for Ultrasound imaging endoscopy Computerized tomography scanning Magnetic resonance imaging scanning
8 The photons emitted in inner shell transition are. Alpha particle Beta particle Gama particle Characteristic X-rays
9 The transition of inner shell electrons in heavy atoms gives rise to the emission of. Low energy b-particle High energy b-particle High energy X- rays<br> High energy gama rays
10 The potential due to which an electron is lifted from gerund state to excited state is. Potential gradient excitation potential Ionization potential Potential difference
11 The ionization energy for hydrogen atom is -11.6 eV -12.6 eV -13.6 eV -19.6 eV
12 The radius of first Bohr's orbit for hydrogen atom is. 0.53 m 0.53 nm 0.053 nm 0.53 mm
13 The wavelength of Lyman series for hydrogen spectrum lies in the. Visible region Ultraviolet region Infrared region Far infrared region
14 An example of continuous spectrum is. Black body radiation spectrum Molecular spectra Atomic spectra All of the above
15 A single quantum of electromagnetic radiation is termed as. Compton Photon Hyperon Meson
16 The emission of photons by a metal when electrons are incident is called. Photo electric effect Pair production X-rays production Gama ray production
17 The 'x' in X-rays means Xenon Explosion x for unknown X makes the spot
18 X-rays travel with The speed of light The speed of sound The speed of 3,000 m s-1 The speed of 3,500 m s-1
19 X-rays are good for imagining Tendons Brain Bones Heart
20 In electromagnetic spectrum X-rays are next to. Water waves Radio waves ultraviolet waves Infrared waves
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