PPSC Physics Topic 7 Modern Physics With Answers

PPSC Physics Topic 7 Modern Physics

Sr. # Questions Answers Choice
1 Which of the following radiations can penetrate 20 cm thick steel. Alpha particles Beta particles Gama particles Neutrons
2 Which particle are not emitted by a radioactive substance. Alpha particles Beta particles Gama particles Neutrons
3 Which Isotopes is use din radioactive dating. C<sup>12</sup> C<sup>13</sup> C<sup>14</sup> C<sup>16</sup>
4 The capture of neutron by a proton results in the formation of. Deuteron and gama rays Deuteron and alpha particle Triton and Beta particles Tritron and X rays
5 The chain reaction is controlled by a series of rods usually made of. uranium Cadimium Boron Steel
6 The binding energy per nucleon for uranium is about. 7.7 MeV 9.6 MeV 13.6 MeV 21.6 MeV
7 The gama rays have Thin tracks Thick tracks No definite tracks Continuous tracks
8 The Beta particles move along. Straight path Curved path Zig Zag path Circular path
9 Binding energy per nucleon is. Greatest for heavy nuclei Least for heavy nuclei Greatest for light nuclei Greatest for medium weight nuclei
10 When a beta particle travels though a medium it knocks out electrons from the atoms due to. Gravitational force of attraction Electrostatic force of repulsion Nuclear force Electromagnetic induction
11 48 days after the receipt the amount of iodine -131 left behind is only. 0.1325 g 0.2135 g 0.3125 g 0.1235 g
12 A newly prepared radioactive nuclide has a decay constant Lamda of 10-6 s-1 What is the approximate half life of the nuclide. 1 hour 1 day 1 week 1 month
13 The half life of a given radioactive isotope is 10 years The original mass of the isotope is 12 g What mass of this isotope remains un decayed after 20 years. 0.5 g 1.2 g 3.0 g 6.0 g
14 The half life of isotopes X is four days and its initial mass is 32 mg What mass of the isotope X will remain after twelve days. 2 mg 4 mg 8 mg 18 mg
15 The reciprocal of decay constant lamda of a radioactive element is. Half life Mean life Total life Curie
16 Phenomenon of radioactivity is due to disintegration of. Proton Neutron electron nucleus
17 Which of the following phenomenon is explained by the tunnel efffect. Alpha decay Beta decay Gama decay Radioactivity
18 The SI unit of radioactivity is. Becquerl Curie Joule rutherford
19 The two elements with same number of electrons but different mass number are called. Isotones Isobars Isotopes Isomers
20 The half life of a radioactive substance as compared to its mean lif eis. 30% 50% 70% 90%
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