PPSC Physics Topic 7 Modern Physics With Answers

PPSC Physics Topic 7 Modern Physics

Sr. # Questions Answers Choice
1 In de Brogile model electron orbit must form Spectrum Wave packets Franhoffer lines Clouds
2 The electron behave an waves because They can be diffracted by a crystal They can produce ions in gases They can be deflected by magnetic field They can be deflected by electric field
3 When using the formula E = h lambda what unit should energy have. Joule Watt second Newton metre Electron volt
4 The most convenient unit for energy at the atomic level is. Joule Watt second Newton metre Electron volt
5 Which particle is removed by a photon. Quark Electron Proton Neutron
6 The splitting of atomic energy levels and the associated spectrum lines when the atoms are placed in a magnetic field is called. The photoelectric effect The zeeman effect The Compton effect Quantum effect
7 The exitance of more than one distinct state with the same energy is called. Exigency Degeneracy Normally Emergency
8 Which experiment is a demonstration that matter and energy can display properties of both waves and particles. young's double slit experiment Division germier experiment Heisenberg's uncertainty experiment Stern Gerlach experiment
9 Most widely used types of gas LASER are Neon Argon ion Helium All of these
10 LASER is a device which can produce. Monochromatic beam of light Coherent beam of light An intense beam of light All of the above
11 In an electronic transition atom cannot emit Gama rays Visible rays Infrared rays Ultraviolet rays
12 The total energy of an electron in an orbit around the nucleus is. Zero Unity Infinity Negative
13 The Inner electrons in heavy atoms can be disturbed and dislodged by. X rays Alpha particle Beta particles gama particles
14 In the experiment of production of X rays electrons are accelerated towards the anode by Thermionic emission Potential difference Breaking potential Cut of current
15 In heavy atims the electrons are assumed to be arranged in. Elliptical shells Inner shells Concentric shells Outer shells
16 The continuous x rays spectrum is obtained due to Deceleration of impact electrons Breaking potential Excitation potential Ionization potential
17 The continuous X rays spectrum is due to an effect. Bremsstrahlung Breaking radiation Holography both a and b
18 Which of the following radiations will burn human skin Infrared Ultraviolet X rays Alpha particles
19 Which animal did Erwin Schrodinger contemplate using in his famous thought experiment. mouse Cat Dog Rabbit
20 Neither the position nor the momentum of a particle can be predicted with arbitrarily great precision is the statement of. Archimede's principle. Heisenberg uncertainty principle Mosley's law Schrodinger's wave equation
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