PPSC Physics Topic 7 Modern Physics With Answers

PPSC Physics Topic 7 Modern Physics

Sr. # Questions Answers Choice
1 Radio carbon in the atmosphere is produced by the bombardment of. Oxygen by high energy neutrons Oxygen by high energy protons Nitrogen by high energy protons Nitrogen by high energy neutrons
2 The scientific theory concerning the coming into existence of universe. Cosmology Cosmogony Cosmography Cosmos
3 The simple form of particle accelerator is. Cathode ray tube Oscillator <sub>Amplifier</sub> Phase locked loop
4 When a helium atom loses an electron it becomes. An a particle A proton A positive helium ion A negative helium ion
5 A solid state detector is basically A reverse biased p-n junction A forward biased p-n junction A p-n -p transistor A n-p-n transistor
6 Particle which can be added to the nucleus of an atom with changing its chemical properties are called. Electrons Protons Neutrons Alpha particles
7 The tunnel effect makes possible Alpha decay Gama rays Positive Beta decay negative Beta dacay
8 Which of the following causes the deflection of Alpha particles when they re passed through a thin foil. Attraction of nucleus Collision with nuclei Interactions with electrons Electrostatic repulsion by the nucleus
9 When we pass a radiation from a radioactive material through an electric field. All three kinds of rays will be deflected Only the Gama rays are deflected The Alpha and Beta particles are deflected Only the alpha particles are deflected
10 In a fission reactor which particle causes a uranium -235 nucleus to split. Alpha particle Gama ray Neutron Proton
11 Which of the following is its own anti particle. Photon Electron Proton positron
12 When an electron and a positron are annihilated, then number of protons produced is. 1 2 3 4
13 Positron are produced during. Annihilation ionization Pair production x rays production
14 The most readily fissionable isotope of uranium has atomic mass of 234 235 236 238
15 The molecular weight of D2O is 16 18 20 24
16 The process of energy generation in sun and stars is. Fusion of heavy nuclei fusion of light nuclei Fission of light nuclei Solar panels
17 The helium nucleus does not contain Two electrons Two neutrons Two protons Six nucleons
18 The number of electrons in U nucleus are. 92 235 zero 143
19 Nuclear force exists between Proton proton Neutron -neutron neutron -proton All of these
20 Alpha particles emitted from a radioactive material are. He nucliei H -nucliei Li nucliei B nucliei
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