PPSC Physics Topic 7 Modern Physics With Answers

PPSC Physics Topic 7 Modern Physics

Sr. # Questions Answers Choice
1 Atomic reactor is based on Controlled chain reaction Uncontrolledly chain reaction Nuclear fission Nuclear fusion
2 Hydrogen bomb is based on Controlled chain reaction Uncontrolled chain reaction Nuclear fusion Nuclear fission
3 When Be is bombarded by alpha particles, then we obtain electron Proton Positron Neutron
4 In the fusion process, there are Hydrogen isotopes Helium Isotopes Carbon isotopes Oxygen isotopes
5 A gama ray of energy 1900 MeV is absorbed by Proton antiproton pair Electron positron pair Producing heat in the substance The orbit
6 Which temperature is required for the fusion of two nuclides. 10<sup>6</sup> K 10<sup>7 </sup>K 10<sup> 8 </sup>K 10 <sup>9</sup> K
7 Which of the following are electromagnetic waves. Alpha particles Beta particles Gama rays Water waves
8 Magnetic field does not cause deflection in Alpha particle Beta minus particles Beta plus particles Gama rays
9 The mass of an alpha particle is. 2 u 4 u 6 u 8 u
10 Marie Curie and Pierre Curie discovered two new radioactive elements which are. Uranium and radkum Platinum and radium Polonium and radium Crypton and radon
11 A freshly made sample of radioactive material gives a count rate of 8,000 counts per minute After twenty days it gives a count rate of 500 counts per minute What is the half life of the materials. 5 days 10 days 40 days 20 days
12 Cs - 137 is a radioisotope used ot determine the thickness of the walls of steel pipes Cs 137 is chosen because it emits Radiowaves Alpha particles Beta particles gama particles
13 A factory buy 100 g of a radioactive chemical with a half life of 5 years which decays to a stable compound How much of the chemical will still be radioactive 10 years time. 25 g 50 g 75 g 100 g
14 The bunding energy per nucleon for iron is. zero Maximum Negative Minimum
15 The most abundant isotope of neon is. Neon -20 Neon -21 Neon -22 Both a and c
16 A device used to determine mass of an isotope quite accurately is known as. Spectrometer Mass spectrometer Mass detector Electronic balance
17 Both xenon and cesium each have 24 isotopes 28 isotopes 32 isotopes 36 isotopes
18 In heavy elements of the periodic table the number of neutrons than protons are. Lesser Greater Equal Undetermined
19 Among different elements of the periodic table which of the following atoms is the simplest. Carbon Oxygen Hydrogen Nitrogen
20 The mass of proton is equal to. 1.673 x 10<sup>-27</sup> kg 1.673 x 10<sup>27</sup> kg 9.1 x 10-31 kg 9.1 x 10<sup>31</sup> kg
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