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1) The rectangular voltage is an example of a. An analogue waveform b. Continuous wave form c. Electronic waveform d. A digital waveform
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2) The operational amplifier is a. A high gain amplifier b. A high-power amplifier c. A high resistance amplifier d. A low resistance amplifier
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3) In a half-wave rectifier the r.m.s. value of the A.C. component of the wave is a. Equal to D.C. value b. More than D.C. value c. Less than D.C. value d. Zero
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4) To obtain an n-type semiconductor germanium crystal it must be doped with foreign atoms whose valency is a. 2 b. 3 c. 4 d. 5
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5) To obtain a p-type semi-conductor Si Crystal must be doped with foreign atoms whose valency is a. 2 b. 3 c. 4 d. 5
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6) The operation of a transistor requires a. That the emitter be heated b. That the base be heated c. That the collector be heated d. None of the above
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7) In forward bias the width of potential barrier a. Increases b. Decreases c. Remains same d. No effect
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8) The working of transistor as amplifier is similar to a. Step up transformer b. Step down transformer c. Three diodes in common d. Triode vacuum tube
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9) The electronic circuits which implement the various logic operations are called a. Logic gates b. Boolean algebra c. Amplifier gain d. Logic functions
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10) An OP-AMP comparator is a circuit that compares the signal voltage on one of its inputs with a a. Non-inverting voltage at output b. Reference voltage on the other c. Virtual input d. Output
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11) An OP-AMPs can amplify a. D.C. b. A.C. c. Both A.C. & D.C. d. None of the above
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12) Non-inverting amplifier circuits have a. A very high input impedance b. A very low input impedance c. A low output impedance d. None of the above
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13) In nucleus of uranium the number of neutrons will be a. 92 b. 235 c. 143 d. different for different isotopes
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14) During fusion of hydrogen into helium a. energy is absorbed b. energy is released c. mass is increased due to energy absorption d. mass is reduced due to energy released
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15) One amu is equal to a. 1.66 x 10-27kg b. 166 x 10-15ng c. 166 x 10-20?g d. all of above
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16) According to which one of following law the density of atom is uniform? a. J.J.Thomson model b. Rutherfords model c. Bohrs model d. all of above laws contradict the statement
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17) For chain reaction to build up the size of the radioactive target should be a. greater than the critical size b. less than the critical size c. equal to the critical size d. all of above can build up a change reaction
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18) Antimatter consists of a. antiproton b. antineutron c. positron d. all of above
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19) Neutron and proton are commonly known as a. nucleon b. meson c. boson d. quartz
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20) Half life of radium is 1590 years. In how many years shall the earth loss all its radium due to radioactive decay? a. 1590x106 years b. 1590x1012 years c. 1590x1024 years d. never
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21) Electrons a. can exist inside the nucleus b. cannot exist inside the nucleus c. can exist both inside and outside the nucleus d. do not know
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22) Energy liberated when one atom of U-235 undergoes fission reaction is a. 200MeV b. 40MeV c. 30MeV d. 20MeV
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23) Transuranic elements have atomic number a. greater than 72 b. greater than 82 c. greater than 92 d. greater than 102
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24) Nuclear forces exist between a. proton-proton b. proton-neutron c. neutron-neutron d. all of the above
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25) Mass defect per nucleon is a. binding energy of nucleus b. packing fraction c. average energy of nucleus d. all of above are one and same thing
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26) Tick the correct statement a. moderators slow down the neutrons b. moderators bring the neutrons to rest c. moderators absorb the neutrons d. moderators reflect the neutrons
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27) Diameter of an atom is approximately a. 10-12m b. 10-11m c. 10-10m d. 10-14m
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28) Average energy required to remove one nucleon from the nucleus is called a. binding energy per nucleon b. energy of decay c. destruction energy d. all of above
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29) Fission chain reaction in a nuclear reactor can be controlled by introducing a. iron rods b. graphite rods c. cadmium rods d. platinum rods
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30) Charge on an electron was determine by a. Ampere b. Maxwell c. Millikan d. Thomson
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31) Charge on neutron is a. plus 1.6 x 10-19C b. zero c. minus 1.6 x 10-19C d. no definite charge
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32) A particle having the mass of an electron and the charge of a proton is called a a. antiproton b. positron c. gamma rays d. photon
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33) Mass of neutron is a. 1.67 x 10-31 kg b. 1.67 x 10-27 kg c. 9.1 x 10-31 kg d. 1.67 x 10-19 kg
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34) Nuclei having the same mass number but different atomic number are a. Isotopes b. Isobars c. Isotones d. Isomers
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35) A mass spectrograph (spectrometer) sorts out a. molecules b. ions c. elements d. isotopes
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36) Sum of the masses of constituent nucleons as compared to the mass of the resultant nucleus is a. smaller b. greater than 82 c. same d. some times smaller some times greater
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37) The unit of radioactivity curie is equal to a. 3.74 x 109 disintegration per sec b. 3.70 x 1010 disintegration per sec c. 3.55 x 1010 disintegration per sec d. 3.60 x 1010 disintegration per sec
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38) During fission process a large amount of a. heat energy is released b. nuclear energy is released c. chemical energy is released d. light energy is released
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39) In liquid metal fast breeder reactor the type of uranium used is a. 92U235 b. 92U238 c. 92U234 d. 92U239
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40) Radioactive materials can be identified by measuring their a. hardness b. density c. mass d. half life
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41) If one or more of the neutrons emitted during fission cab be used to build up further fission then the reaction is self sustained and is known as a. fission reaction b. fusion reaction c. chain reaction d. chemical reaction
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42) Pair production takes place in the vicinity of a heavy nucleus so that a. net energy is conserved b. net charge is conserved c. net momentum is conserved d. all of the above
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43) During an encounter with an atom ?-particle knocks out a. protons b. electrons c. neutrons d. nothing
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44) Various types of cancer are treated by a. cobalt-60 b. strontium-90 c. carbon-14 d. nickel-63
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45) Geiger counter is suitable for a. fast counting b. extremely fast counting c. slow counting d. all situations
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46) Pair production cannot take place in vacuum as ________ is not conserved a. energy b. charge c. mass d. momentum
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47) CFC is used in a. refrigeration b. aerosol spray c. plastic foam industry d. all of above
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48) The most useful tracer is a. Sr-90 b. I-131 c. CA-41 d. C-14
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49) Pair production cannot take place in vacuum as a. mass is not conserved b. energy is not conserved c. momentum is not conserved d. charge is not conserved
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50) A device for producing high velocity nuclei is a. cloud chamber b. linear accelerator c. a mass spectrograph d. Wilson cloud chamber
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51) The maximum safe limit dose for persons working in nuclear power station are a. 1 rem per week b. 5 rem per week c. 4 rem per week d. 3 rem per week
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