Nuclear Physics 2 Comments / Uncategorized / By buzzerkings 15 Created on May 14, 2023 By buzzerkingsNuclear Physics 1 / 513.8 days is the half-life period of a sample. After how many days, the sample will become 1/8th of the original substance 11.4 3.8 3 None of these 2 / 51After 1a and 2 ẞ emissions Mass number reduces by 3 Mass number reduces by 4 Mass number reduces by 6 Atomic number remains unchanged 3 / 51A radioactive element emits 200 particles per second. After three hours 25 particles per second are emitted. The half-life period of element will be 50 minutes 60 minutes 70 minutes 80 minutes 4 / 51 Curie is a unit of Length It is not any unit Activity Atomic number 5 / 51The decay constant of radium is 4.28×10^-4 per year. Its half-life will be 2000 years 1240 years 63 years 1620 years 6 / 51 In a radioactive substance at t = 0, the number of atoms is 8×10^4. Its half-life period is 3 years. The number of atoms 1×10^4 will remain after interval. 9 years 8 years 6 years 24 years 7 / 51The radioactivity of a certain radioactive element drops to 1/64 of its initial value in 30 second. Its half-life is 2 second 4 second 5 second 6 second 8 / 51 1 amu is equivalent to 931 MeV 931 keV 391MeV 391 keV 9 / 51 Which of the following cannot be emitted by radioactive substance during their decay? electrons protons neutrinos helium nuclei 10 / 51After 280 days, the activity of radioactive sample is 6000 disintegration per second. The activity reduces to 3000 disintegration per second after an-other 140 days. The initial activity of the sample in disintegration per second is 6000 9000 3000 24000 11 / 51 A sample contains 10 mg of radio-active material of half-life 270 days. After 540 days the mass of radio-active material left will be 5 mg 2.5 mg 1.25 mg zero 12 / 51What percentage of original radioactive atom is left after five half-lives? 3% 5% 10% 20% 13 / 51 In any fission process the ratio ( mass of fission products / mass of parents nucleus) is: less than 1 equal to 1 depends on the mass of the parent nucleus greater than 1 14 / 51Fusion reaction takes place at high temperature because atoms are ionized at high temperature molecules break-up at high temperature nuclei break-up at high temperature kinetic energy is high enough to overcome repulsion between nuclei 15 / 51The half-life of a certain radioactive element is such that 7/8 of a given quantity decays in 12 days. What fraction remains undecayed after 24 days? 0 1/128 1/64 1/32 16 / 51The difference between U235 and U238 atom is that U238 contains 3 more protons U238 contains 3 more protons and 3 more electrons. U238 contains 3 more neutrons and 3 more electrons. U238 contains 3 more neutrons. 17 / 51Neutron decay in the free space is given as follows 0n1 → 1H1 + -1e° +[ ]Then the parenthesis represents an Photon graviton neutrino antineutrino 18 / 51The half-life period of a radioactive substance is 5 min. The amount of substance decayed in 20 min will be 75% 25% 93.75% 6.25% 19 / 51A radioactive nucleus 92X235 decays to 91Y231. Which of the following particles are emitted two deuterons and one positron one alpha and one electron one alpha and one proton one proton and four neutrons 20 / 51The decay constant of a radioactive element is 0.01 per second. Its half-life period is 0.693 sec 69.3 sec 6.93 sec 693 sec 21 / 51A sample contains 16 gm of a radioactive material, the half life of which is two days. After 32 days, the amount of radioactive material left in the sample is 14gm less than 1 mg 12gm 1gm 22 / 51The decay constant of radium is 4.28×10^-4 per year. Its half-life will be 1240 years 2000 years 1620 years 63 years 23 / 51 The percentage of radioactive nucleus that remains undecayed after 5 half-lives is nearly 3% 5% 10% 20% 24 / 51 The radioactivity of a certain radioactive element drops to 1/64 of its initial value in 30 seconds. Its half-life is 4 seconds 3 seconds 5 seconds 2 seconds 25 / 51A radioactive substance is at t=0, the number of atoms is 8×10^4. Its half-life period is 3 years. The number of atoms 1×10^4 will remain after interval 19 years 24 years 9 years 6 years 26 / 51 9038Sr decays to 9039Y by emission of a-particles emission of B-particles emission of 1a and 2ẞ particles absorption of electrons 27 / 51One atomic mass unit is equal to Mass of one atom of hydrogen Mass of one atom of 6C^12 1/12th of the mass of one atom of 6C^12 10^-27 kg 28 / 51Quarks are basic building block of Mesons Electrons Baryons A and C 29 / 51 The mass of the nucleus is always less that the total mass of the protons and neutrons that make up the nucleus. The difference of the two masses is called Mass defect Binding energy Mass excess Packing fraction 30 / 51A fusion reaction is initiated with help of High temperature Neutrons Low temperature a particles 31 / 51The best place to store/dump nuclear waste is Under the sea Into the soil Under the old salt mines All of these 32 / 51 For atomic nucleus, the binding energy per nucleon ____with increase in mass number Increases continuously Decrease continuously Remains constant First increases and then decreases with increase in mass number 33 / 51 Which of the following factor measure the stability of radioactive element? average live Total life Half life All of these 34 / 51One reaction which might be used for controlled nuclear fusion is shown.37Li + 12H → 2( 24He) + XWhat is particle X? An a-particle An electron A neutron A proton 35 / 51Which element was used in atomic bombs dropped at Hiroshima and Nagasaki Uranium radium protactinum Plutonium 36 / 51The fission of U238 is possible by Only fast neutrons Fast as well as slow neutrons Only slow neutrons Fast protons 37 / 51A substance reduces to th of its original mass in 2 hours. The half-life period of the 16 substance is: 120 min 30 min 15 min 60 min 38 / 5115 In the following nuclear reaction, how many a and ẞ particles are emitted?92X 235 → 82Y-207 3 a-particles and 2 B-particles 6a -particles and 2 ẞ-particles 7 a -particles and 4 B-particles 4a -particles and 2 B-particles 39 / 51The half-life of a radioactive element which has only1/32 of its original mass left after a lapse of 60 days is: 12 days 60 days 32 days 64 days 40 / 51 The percentage of the original of a radioactive material left after five half-lives is approximately: 1% 5% 3% 20% 41 / 51One curie is equal to 3.70 × 10^10 Bq 3.70 x 10^10 Henry 3.7 x 10^16 Bq 3.7 x 10^25 Bq 42 / 51Which one of the following is undeflected by electric or magnetic field? Electrons B-particles a-particles y-particles 43 / 51The phenomenon of spontaneous disintegration of heavier elements (Z>82) into lighter nuclei with the emission of three types of radiation is Radioactivity Resistivity Conductivity Population inversion 44 / 51Three fourths of the radioactive nuclei present in a radioactive sample decay in 3/4s. The half-life of the sample is: 3 /4 S 1 s 3/8 s 1/2 s 45 / 51What fraction of a radioactive material will get disintegrated in a period of two half- lives? Whole One-fourth Half Three-fourth 46 / 51Half-life of a radioactive material depends on: Temperature Quantity of the material Nature of the material All 47 / 51The most penetrating radiation out of the following is: X-rays ẞ-rays α-rays y-rays 48 / 51In the reaction: 2412Mg + 42He→ x14Si+10n, x is: 28 26 27 22 49 / 51The half-life of the isotope 2411Na is 15 hours. How much times does it take for 7/8 th of a sample of this isotope to decay? 75 h 55 h 65 h 45 h 50 / 51In an a-decay The Parent and daughter nuclei have the same number of protons The daughter nucleus has one proton more than the parent nucleus The daughter nucleus has two protons less than the parent nucleus The parent and daughter nuclei have the same number of neutrons 51 / 51Radioactivity was discovered by J.J. Thomson W. Roentgen H. Becquerel M. Curie Your score isThe average score is 57% LinkedIn Facebook Twitter VKontakte 0% Restart quiz

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