1st PUC physics Series-8 December 3, 2020December 23, 2020wefruPUC Science 1st Year Physics Series-8 quiz 0 Created on December 02, 2020 By wefru1st PUC Physics Series 8TEST YOUR KNOWLEDGE OF SCIENCE 1 / 10Q.71 Radioactive material A has a decay constant 8λ and material B has a decay constant λ. Initially, they have the same number of nuclei. After what time, the ratio of the number of nuclei of material B to that A will be 1/e? 1/7λ 25/7λ 15/7λ 781/7λ 2 / 10Q.72 The half-life of a radioactive substance is 30 minutes. The time (in minutes) taken between 40% decay and 85% decay of the same radioactive substance is 60 20 10 15 3 / 10Q.73 If the radius of the 13Al27 nucleus is taken to be RAl then the radius of 53Te125 nucleus is nearly 5/3 RAl 5201/3 RAl 5/301 RAl 201 4 / 10Q.74 A nucleus of uranium decays at rest into nuclei of thorium and helium. Then, The helium nucleus has more kinetic energy than the thorium nucleus The helium nucleus has less momentum than the thorium nucleus The helium nucleus has more momentum than the thorium nucleus The helium nucleus has less kinetic energy than the thorium nucleus 5 / 10Q.75The binding energy per nucleon of 3Li7 and 2He4 nuclei are 5.60 meV and 7.06meV respectively.In the nuclear reaction 3Li7 + 1H1 ➡️ 2He4 +2He4+Q, the value of energy Q released is 17.3 MeV 7.3 MeV 27.3 MeV 37.3 MeV 6 / 10Q.76 Calculate the mass defect(amu/atom) for a 37Cl atom for which the actual mass is 36.966 amu. 0.341 amu 1.341 amu 2.341 amu 3.341 amu 7 / 10Q.77 The mass defect for an isotope is 0.410 amu/atom. Calculate the value of binding energy. 3.69 x 1010 kJ/mol 69 x 1010 kJ/mol 4.69 x 1010 kJ/mol 5.69 x 1010 kJ/mol 8 / 10Q.78 Which isotope below has the highest binding energy? 55Mn 5Mn 563Mn 77Mn 9 / 10Q.79 Which of the following sentences is incorrect? The total mass of protons and electrons in the atom. The most stable nuclei are molecules with the highest binding energy. It the nucleus was formed from initially separated protons and electrons then the amount of matter converted into energy was called Mass defect. Nuclear binding energy is the energy released in the formation of an atom from subatomic particles 10 / 10Q.80A nucleus has a mass number A, atomic number Z and a binding energy B. The mass of neutron and proton are mn and mp respectively and cis the speed of light.Which of the following expressions correctly represents the mass of the nucleus? (A – Z)mn+Zmp-B/c2 (A – Z)mn+Zmp+ B/c2 (A + Z)mn+Zmp+ B/c2 (A + Z)mn+Zmp– B/c2 Your score isThe average score is 0% LinkedIn Facebook Twitter VKontakte 0% Restart quiz
