PPSC Physics Full Book With Answers

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PPSC Physics Full Book

Sr. # Questions Answers Choice
1 Why FET amplifiers are called voltage controlled devices. Input is a current signal Output is a current signal Input is a voltage signal Output is a voltage signal
2 Which of the following configuration of BJTs gives both voltage gain and current gain. common Base Common Emtter Common collector All of the above
3 An emitter follower has High input impedance and high output impedance High input impedance and low output impedance Low input impedance and low output impedance Low input impedance and high output impedance
4 Lissajou's figures are used in a Cathode Ray Oscilloscope while measuring. Time period Frequency Voltage gain phase angle
5 In a resistor, when base width decreases with increasing Vbc, this phenomenon is called. Tunneling Thermal runway Pinch off Early effect
6 How many terminals does a BJT have. 1 2 3 4
7 The average energy released per fission of U is about 200 eV 2 keV 2 MeV 200 MeV
8 Which of the following has greatest binding energy per nucleon. Normal hydrogen Deuterium Tritium Helium-4
9 One particle having zero mass and zero charge is. Positron Electron Neutrino Neutron
10 A deuteron is A type of proton A proton neutron bounded to gather. A type of beta particle A type of neutron
11 Deuterium is A transuranic element A type o cosmic particle An isotope of hydrogen An isotope of helium
12 The half life of a radioactive substance depend on. Pressure Temperature Amount of substance No external influences
13 The loss of mass in a.m.u in a nuclear change can be calculated from energy involved in MeV by Dividing by 931 Multiplying by 931 Diving by 391 Multiplying by 391
14 Nuclear force as compared to electrostatic force is. Weaker and long range Weaker and short range Stronger and longer range Stronger and short range
15 A slow neutron can cause fission in Uranium -238 Uranium-235 Hydrogen-1 Thorium -232
16 The critical mass of fissionable uranium -235 can be reduced by Adding impurities to it Heating the material surrounding it by neutron reflecting material Surrounding it by neutron absorbing material
17 When a posirtron is emitted it causes. Mass number to increase by one mass number to decrease by one Atomic number to decrease by one Atomic number to increase by one
18 Neutrino9 is a particle with Charge less property and has no spin Charge less property and has spin Charge less like electron and has spin The same property as neutron
19 Tracer techniques make use of. Neutron scattering Electron beams LASER Radioactive isotopes
20 The critical mass of a fission reaction is. The mass to start a nuclear fission reaction The minimum mass for chain reaction The size of the reactor core The size of fuel plus the size of moderator
21 Which of the following is formed by decay of a free neurton. A number of electrons Two protons A proton and an electron An alpha particle
22 Which of the following particles leave no trail in a cloud chamber. Electrons Protons Alpha particles Neutrons
23 Which of the following is not a mode of radioactive decay. Positron emission Electron capture Fusion reaction A decay
24 Which of the following can be used as an arrester in a nuclear reactor. Graphite heavy water Uranium Cadmium
25 Which of the following is believed to be carrier o nuclear forces. Lepton Meson Bason Baryon
26 In fission reaction, heavy water is used as a Coolant Moderator Heat exchanger Controller of reaction rate
27 Which of the following is the most massive particle. Deuteron Alpha particle Neutron positron
28 In a nuclear reactor chani reaction is controlled by introducing. Iron rods Cadmium rods Graphite rods Platinum rods
29 The process by which nuclei emit a ,b and gama rays in order to attain stability is called. Radioactive disintegration Radio activity B decay Radioactive transmulation
30 Sub atomic paticles whihc does not experience strong nuclear force are. hadrons Photons Leptons Nucleons
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