PPSC Physics Topic 7 Modern Physics With Answers

PPSC Physics Topic 7 Modern Physics

Sr. # Questions Answers Choice
1 Alpha particles are used for the treatment of skin of a patient due to. Highly ionizing power Low penetration power Positively charged particles Helium nucler
2 Which of the following detectors can count fast and operate at low voltage. G.M Counter Cloud chamber Solid state detector Bubble chamber
3 Specially designed solid state detector can be used to detect. Alpha particles Beta particles Gama rays X- rays
4 An Alpha particle is the same as A helium nucleus A high speed electron A hydrogen nucleus Electromagnetic radiation of short wavelength
5 The result of the alpha particle scattering experiment gave evidence for which of the following. Nuclear fusion Radio active decay Existence of isotopes Nuclear atom
6 Which type of radiation would be stopped completely by a thin piece of cardboard. Alpha particles Beta particles Gama rays X -rays
7 The half life of a radioactive element depends upon. Temperature pressure nature of element quantity of the element
8 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
9 Which of the following is not a mode of radioactive decay Nuclear fusion Alpha decay Electron capture Positron emission
10 The reciprocal of decay constant lamda of a radioactive substances is equal to. total life Half life Mean life Curie
11 Radioactive substances do not emit Alpha particles Beta particles Gama rays Neutrons
12 Radioactivity is the phenomenon associated with the. Transition of radiowaves production of alpha particles only Decay of nucleus Reception of radio waves
13 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
14 Which is the famous standard model of the universe. the big bang Casmos Astronaut The small stap
15 Which particles have spin quantum number 1/2 Mesons Laptons Hadrons Muons
16 The unit generally used for measuring astronomical distances is. Parsecs Light year Metre Kilometer
17 How many types of quarks were suggested i 1964 quark theory. Two Three Four Five
18 There are how many types of forces or interactions. Two Three Four Five
19 Which six particles and their antiparticles interact by the weak interaction. Leptons Hadrons Muons pi mesons
20 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
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