PPSC Physics Full Book With Answers

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PPSC Physics Full Book

Sr. # Questions Answers Choice
1 The half life of a radioactive element depends upon. Temperature pressure nature of element quantity of the element
2 Half life and mean lifetime of a radioactive element are. Equal to each other Inversely proportional to each other Directly proportional to each other Not related to each other
3 Which of the following is not a mode of radioactive decay Nuclear fusion Alpha decay Electron capture Positron emission
4 The reciprocal of decay constant lamda of a radioactive substances is equal to. total life Half life Mean life Curie
5 Radioactive substances do not emit Alpha particles Beta particles Gama rays Neutrons
6 Radioactivity is the phenomenon associated with the. Transition of radiowaves production of alpha particles only Decay of nucleus Reception of radio waves
7 The half life of a radioactive substance is 6 years What is the time taken by 12 g of this substance to decay completely. 12 years 24 years 48 years infinity
8 Which is the famous standard model of the universe. the big bang Casmos Astronaut The small stap
9 Which particles have spin quantum number 1/2 Mesons Laptons Hadrons Muons
10 The unit generally used for measuring astronomical distances is. Parsecs Light year Metre Kilometer
11 How many types of quarks were suggested i 1964 quark theory. Two Three Four Five
12 There are how many types of forces or interactions. Two Three Four Five
13 Which six particles and their antiparticles interact by the weak interaction. Leptons Hadrons Muons pi mesons
14 In a Geiger Marsden experiment why do the great majority of the Alpha particles pass straight through the metal foil. Atomic nuclei may contain neutrons Atoms are electrically neutral Atoms are largely empty space Atoms have positively charged nuclei
15 In the Geiger Marsden experiment a narrow beam of alpha particles was fired at a thin piece of Gold foil in a vacuum Some of the particles were scattered though large angles The result of the experiment provided evidence for the existence of. A very small charged nucleus electrons orbiting the nucleus Neutrons in the nucleus Nuclear reaction
16 Which particle interact via all fundamental forces. Leptons Hadrons Muons mesons
17 Which of the following are particle accelerators. Cyclotrons Synchrotrons Linear accelerators All of the above
18 The best shield against Gama rays would be of Heavy water Aluminium Iron Lead
19 The working of cloud chamber is based in the presence of. Super heated vapours Liquid Super saturated vapors Unsaturated vapours
20 The path of Gama rays in Wilson cloud chamber is Irregular Dense and straight Thin and continuous Thin and discontinuous
21 What are isotopes. Atoms of the same element with different numbers of neutrons. Atoms of the same element with different numbers of protons. Atoms which are radioactive Atoms which have gained or lost an electron
22 The neutral atoms of all isotopes of the same element contain the same numbers of. Electrons and protons Electrons and neutrons Neutrons Neutrons and protons
23 The back ground radiation in the atmosphere on the average is 0.5 Sv per year 1.0 Sv per year 1.5 Sv per year 2.0 Sv per year
24 In a cloud chamber the Alpha particles leave Dense, straight and continuous tracks Only straight and continuous tracks Thin and discontinuous tracks Irregular tracks
25 Which particle has zero charge and zero rest mass. Neutron Proton Electron Photon
26 In which reaction two or more small light nuclei nuclei come together or fuse to form a large nucleus. Radioactivity Radioactivity dating Nuclear fusion Nuclear fission
27 In a Nuclear reactor which material is often used as modeerator. Water Graphite Uranium Water and graphite
28 In which of the following controlled nuclear chain reaction is used to liberate energy. Nuclear bomb Atomic bomb Hydrogen bomb Nuclear reactor
29 Induced fission result from the absorption of electron Proton Nucleon Neutron
30 Ashes from a campfire deep in a cave show carbon -14 activity of only one eighth the activity of fresh wood. How long ago was that campfire made. 13590 years 15190 years 17190 years 21190 years
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