ECAT Pre General Science Physics Chapter 21 Nuclear Physics Online Test With Answers

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ECAT Pre General Science Physics Chapter 21 Nuclear Physics Online Test

Sr. # Questions Answers Choice
1 The figure 1.007276μ shows the mass of an: Atom Positron Electron Neutron Proton
2 Nucleon means: Only electrons Only neutrons Only protons Both (A ) and (C) Both (B) and (C)
3 Neutron was disvovered by: Rutherford in 1920 Chadwick in 1922 Bohr in 1913 Compton in 1927 None of these
4 Neutron was suggested to be in the nucleus by: Rutherford in 1920 Bohar in 1913 Dirac in 1928 Anderson in 1932 None of these
5 Which of these is not a radiation detector Wilson cloud chamber cyclotron acceleration Geiger Miller counter solid state detector
6 When a charged particle passes through matter, it produces ionization, this effect is used in fission reaction reactor radiation detector fusion reaction
7 Radiation detector are used to measure intensity of radiation measure energy of radiation difference between different types of radiation all the above
8 Pair production take place when energy ofγ-rays photon is equal to 1.02 Mev- greater than 1.02 Mev less than 1.02 Mev none of these
9 γ-rays behave like a particle because they explain the Compton effect Photoelectric effect Pair-production all the above
10 γ-rays are electrostatic waves electromagnetic waves heavy particles longitudinal waves
11 The penetration power ofβ-particle is zero less than<span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: small;">α-particle</span> equal to<span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: small;">α-particle</span> greater than<span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: small;">α-particle</span>
12 The range ofβ-particle in air is greater than that ofα-particle by 1000 times 100 times 15 times 10 times
13 β-particles are easily deflected by collisions than heavy <span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: small;">α-particles</span> <span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: small;">β-particles</span> <span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: small;">γ-particles</span> none of these
14 How much time, theα-particle more massive than an electron 600 7000 5000 15000
15 The range of particle depends upon the factor charge, mass and energy of particle density of medium ionization potential of the atoms all the above
16 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
17 Which of the following material has smaller has life uranium polonium radium radian
18 Which of the following material has longer half life radium polonium radium uranium
19 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
20 The half lie of radium-226 is 238 years 4.5 x 10<sup>9</sup>days 1620 years 332 years
21 The unit of decay constant is sex sec<sup>2</sup> sec<sup>-1</sup> sec<sup>-2</sup>
22 Fraction of the decaying atoms per unit time is called decay atom decay element decay constant decay
23 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
24 In radio-active decay, the original element which disintegrate to another element is called element daughter element parent element none of these
25 The emission of radiations take place in elements, having charge number greater than 109 82 69 52
26 The time required for a radioactive material to decrease in active by one half is called half time half life disintegration time mean life
27 The half life of radioactive substances depends upon amount of substance energy of substance state of substance temperature of substance
28 Different radioactive material have same half lives different half lives same mean lives same total lives
29 The rate of decay of a radioactive substance decrease exponentially with time decreases linearly with time increases linearly with time increases exponentially with time
30 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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