ECAT Pre General Science Online Test With Answers

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ECAT Pre General Science Online Test

Sr. # Questions Answers Choice
1 When a shell explodes in mid-air, its fragments fly off in only one direction in two direction different directions a particular direction
2 Suppose the water flows out from a pipe at 3kg s-1and its velocity changes from 5m s-1to zero on striking the wall, then the force exerted by water on wall will be 5 N 10 N 15 N 20 N
3 A snooker ball moving with velocity V collides head on with another snooker ball of same mass at rest. If the collision is elastic, the velocity of second snooker ball is Zero Infinity V 2 V
4 An alpha particle has a charge of +2e -2e -e +3e
5 When a nucleus emits an alpha particles, its charge number decreases by 3 2 6 5
6 When a nucleus emits an alpha particle, it atomic mass decreased by 2 1 4 3
7 Radioactivity is self disruptive activity spontaneous activity exhibited by all elements under proper conditions both 'a' and 'b'
8 Curie is a unit of reluctance resistivity binding energy radioactivity
9 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
10 Gamma rays consist of steam of electron proton photons all of these
11 Alfa particles are hydrogen nuclei helium nuclei electrons photons
12 Beta particles are hydrogen nuclei helium nuclei electrons photons
13 Maric Curie and Pieree Curie discovered two new radioactive elements, which are called polonium uranium uranium and radium polonium and radium none of these
14 Radioactivity was discovered by Rutherford Henri Becqureal Maxwell James Chadwick
15 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
16 Binding energy per nucleus is greater for heavy nucleus least for heavy nucleus greatest for light nuclei decreases for medium weight niclei
17 The amount of energy equivalent to 1 a.m.u is 9.315 Mev 93.15 Mev 931.5 Mev 2.22 Mev
18 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
19 The missing mass which is converted to energy in the formation of nucleus, is called packing fraction mass defect binding energy none of these
20 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
21 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
22 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
23 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
24 Neon gas have three isotopes whose atomic numbers are 20, 24 , 23 20, 21 , 22 20, 19 , 21 none of these
25 The most abundant isotope of neon is neon-20 neon-21 neon-22 neon-23
26 A mass spectrograph sort out molecules atoms elements isotopes
27 The chemical properties of an element depends upon the number of electron position photons neutrons
28 The chemical properties of all the isotopes of an elements are same different slightly different none of these
29 Hydrogen atom with only one proton and one neutron in its nucleus, and one electron, is called deuterium protium tritium none of these
30 Hydrogen atom with only one proton in its nucleus, and one electron in its orbit is called deuteron deterium protium tritium
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