PPSC Physics Topic 7 Modern Physics With Answers

PPSC Physics Topic 7 Modern Physics

Sr. # Questions Answers Choice
1 As the mass number increases, the binding energy per nucleon in a nucleus Increases Decreases Remain constant Varies in a way that depends upon A
2 As the mass number varies, which of the quantities does not change w.r.t nucleus. Mass Volume Binding energy Density
3 The hyperfine lines in the spectrum relates to Stark effect Zeeman effect Lande's spliting Nuclear magnetic spin
4 Mean life of a radioactive sample is 100 s its half life will be 0.693 s <div>1 s</div> 6.93 s 69.3 s
5 Which both elements are good for nuclear fission. Thorium an uranium Thorium and radium Plutonium and uranium Plutonium and throrium
6 From which radiation it is most difficult to protect oneslelf. Alpha radiation Beta radiation Gama radiation Heat radiation
7 During the alpha decay process A neutron is emitted a electron is emitted A helium core is emitted A proton core is emitted
8 A body moves with velocity of 2 x 106 m s-1 its relativistic mass becomes Zero Unity Double of its rest mass Infinity
9 Which of the following is invariant under Galilean transformation. Velocity Impulse Momentum Distance
10 The division and germier experiment relates to Diffusion interference Polarization Electron diffraction
11 Cosmic rays mostly comprise of Neutral particles Negative charged particles Positively charged particles Ions
12 Which experiment confirmed the de Broglie hypothesis. <div>Double slit experiment</div> Division germier experiment Schrodinger's Cat experment Bohr's experiment
13 The energy in electron volts necessary to remove the most loosely bound electron from the neutral atom is known as. Faraday energy Wave number Ionization Potential Excitation potential
14 Ionization of a hydrogen atom originally in its ground state takes a minimum out of energy equal to. 2.4 J 4.2 J 12.3 eV 13.6 eV
15 The angular speed of an electron in the nth orbit of Bohr's hydrogen atom is. Directly proportional to n Directly proportional to n2 Inversely proportional to n Inversely proportional to n2
16 LASER beam my be measure very large distance because it is. Inidirectional coherent Monochromatic Not absorbed
17 The usefulness of X rays is largely due to their Mass Density Volume Penetrating power
18 What is the scale for measurement of Banbridge mass spectrograph. Linear Inverse Exponential Logarithmic
19 What is the relativistic version of the Schrodinger equation. Klein Gordon equation Laplace equation Quadratic equation Binomial equation.
20 The energy equivalent of 1 kg of matter a 10<sup>-15</sup> J 1 J 10<sup>12</sup>J 10<sup>17</sup> J
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