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 When radioactive nucleus emits aβ-particle, the proton-neutron ratio decrease increase same none of these
2 Phenomenon of radioactivity is due to disintegration of nucleus neutron proton molecule
3 A curie represents a very strong source of <span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: small;">α-particle</span> <span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: small;">β-particle</span> <span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: small;">γ-particle</span> none of these
4 The rate of decay of radioactive substance is constant decrease exponentially with time varies inversely as time decreases linearly with time
5 If a nucleus emits an alpha particle, its mass number decreases by 4 while charge number decreased by -4 4 2 1
6 An alpha particle has a charge of +2e -2e -e +3e
7 When a nucleus emits an alpha particles, its charge number decreases by 3 2 6 5
8 When a nucleus emits an alpha particle, it atomic mass decreased by 2 1 4 3
9 Radioactivity is self disruptive activity spontaneous activity exhibited by all elements under proper conditions both 'a' and 'b'
10 Curie is a unit of reluctance resistivity binding energy radioactivity
11 Alfa , beta and gamma rays are emitted from a radio-active substance spontaneously when it is heated when it is exposed to light When it interacts with the other particle
12 Gamma rays consist of steam of electron proton photons all of these
13 Alfa particles are hydrogen nuclei helium nuclei electrons photons
14 Beta particles are hydrogen nuclei helium nuclei electrons photons
15 Maric Curie and Pieree Curie discovered two new radioactive elements, which are called polonium uranium uranium and radium polonium and radium none of these
16 Radioactivity was discovered by Rutherford Henri Becqureal Maxwell James Chadwick
17 Radioactivity is exhibited more by semiconductors in general in exhibited more by the element when they are coupled with other radioactive elements by a covalent bond is an atomic property of radioactive elements
18 Binding energy per nucleus is greater for heavy nucleus least for heavy nucleus greatest for light nuclei decreases for medium weight niclei
19 The amount of energy equivalent to 1 a.m.u is 9.315 Mev 93.15 Mev 931.5 Mev 2.22 Mev
20 The energy is found from Einstein's mass energy relation is called binding energy of electron binding energy of proton binding energy of neutron binding energy of nucleus
21 The missing mass which is converted to energy in the formation of nucleus, is called packing fraction mass defect binding energy none of these
22 The energy acquired by a mass of 1g moving with the speed of light is 3 x 10<sup>8</sup>J 9 x 10<sup>13</sup>J 3 x 10<sup>13</sup>J 9 x 10<sup>16</sup>J
23 If 'V' is the relativistic speed and 'C' is the speed of light then according to Einstien the factor V/C must always be Equal to 1 Less than 1 Greater than 1 Infinity
24 1 amu is equal to. 1.66 x 10<sup>-24</sup>kg 1.66 x 10<sup>-19</sup>kg 1.66 x 10<sup>-24</sup>kg 1.66 x 10<sup>-27</sup>kg
25 The mass of the nucleus is always less than the total man of the protons and neutron that make up the nucleus. The difference of the two masses is called nuclear fission nuclear fusion man defect radioactivity
26 Neon gas have three isotopes whose atomic numbers are 20, 24 , 23 20, 21 , 22 20, 19 , 21 none of these
27 The most abundant isotope of neon is neon-20 neon-21 neon-22 neon-23
28 A mass spectrograph sort out molecules atoms elements isotopes
29 The chemical properties of an element depends upon the number of electron position photons neutrons
30 The chemical properties of all the isotopes of an elements are same different slightly different none of these
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