Physics ECAT Pre Engineering Chapter 21 Nuclear Physics Physics Online Test With Answers

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Physics ECAT Pre Engineering Chapter 21 Nuclear Physics Physics Online Test

Sr. # Questions Answers Choice
1 The distance travelled byα-particle in a medium before coming to rest, is called range of<span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: small;">γ-particle</span> range of neutrons range of particle none of these
2 Which of the following material has smaller has life uranium polonium radium radian
3 Which of the following material has longer half life radium polonium radium uranium
4 The half life of uranium-238 is 6.2 x 10<sup>9</sup>years 4.5 x 10<sup>9</sup>days 4.5 x 10<sup>9</sup>years 1.3 x 10<sup>6</sup>years
5 The half lie of radium-226 is 238 years 4.5 x 10<sup>9</sup>days 1620 years 332 years
6 The unit of decay constant is sex sec<sup>2</sup> sec<sup>-1</sup> sec<sup>-2</sup>
7 Fraction of the decaying atoms per unit time is called decay atom decay element decay constant decay
8 In radioactive decay, the new element which is formed due to the disintegration of original element is called element daughter element parent element none of these
9 In radio-active decay, the original element which disintegrate to another element is called element daughter element parent element none of these
10 The emission of radiations take place in elements, having charge number greater than 109 82 69 52
11 The time required for a radioactive material to decrease in active by one half is called half time half life disintegration time mean life
12 The half life of radioactive substances depends upon amount of substance energy of substance state of substance temperature of substance
13 Different radioactive material have same half lives different half lives same mean lives same total lives
14 The rate of decay of a radioactive substance decrease exponentially with time decreases linearly with time increases linearly with time increases exponentially with time
15 After alpha decay the atomic number of the atom increase by four decreases by two increases by two decrease by four
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