ECAT Pre General Science Online Test With Answers

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ECAT Pre General Science Online Test

Sr. # Questions Answers Choice
1 How many isotopes of helium are present? 1 2 3 4
2 The number of isotopes of hydrogen are 2 1 3 4
3 Nuclei that have the same charge number but different mass number are called isotones isomers isotopes isobars
4 Electrons are positive charged negatively charged massless neutral
5 Neutrons are positive charge negatively charged massless neutral
6 The diameter of an atom is of the order 10<sup>-125</sup>m 10<sup>-11</sup>m 10<sup>-10</sup>m 10<sup>-9</sup>m
7 Structure of the nucleus was explained by J.J Thomson Bohr Millikan Rutherford
8 Charge on proton is 1.59 x 10<sup>-9</sup>C 1.59 x 10<sup>-7</sup>C -1.59 x 10<sup>-19 </sup>C 1.59 x 10<sup>-19</sup>C
9 Mass of proton is of order of 10<sup>-31</sup>gm 10<sup>-27</sup>kg 10<sup>-24</sup>gm 10<sup>+27</sup>kg
10 The number if neutrons in the nucleus of 92U235are Infinite 92 235 143
11 For an atom having atomic number Z and atomic weight A, the number of electron in an atoms A - Z A + Z Z A
12 For an atom having atomic number Z and atomic weight A, the charge on the nucleus is A - Z A + Z Z A
13 The number of all the protons and neutrons in a nucleus is known as atomic number mass number charge number none of these
14 The number of protons inside a nucleus is called mass number atomic weight atomic number none of these
15 The total charge of any nucleus is given as Ze<sup>2</sup> Z<sup>2</sup>e Z/e Ze
16 The nucleous of uranium -235 differs from a nucleous of a uranium -238 in that the later contains 3 more neutrons 3 more electrons 3 more protons 3 more ions
17 For an atom having atomic number 'Z' and atomic weight 'A', the number of neutrons in the nucleous is A - Z A Z A + Z
18 According to Rutherford atomic model, the positive charge in an atom is concentrated at its centre is in the form of positive electron at same distance from its centre is spread uniformly through its volume none of these
19 The chemical behaviour of an atom is determined by binding energy atomic number mass number number of isotopes
20 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>-34</sup>kg 1.66 x 10<sup>-27</sup>kg
21 Mass of proton is 1.67 x 10<sup>-27</sup>kg 1.67 x 10<sup>-31</sup>kg 1.66 x 10<sup>-34</sup>kg 1.67 x 10<sup>-17</sup>kg
22 Mass of neutron is 1.67 x 10<sup>-31</sup>kg 1.67 x 10<sup>-27</sup>kg 9.1 x 10<sup>-31</sup>kg 1.67 x 10<sup>-</sup>19kg
23 Nucleus consists of proton and neutron protons and electron electron and neutron protons only
24 A particle having the mass of electron and charge of a proton is called a photon position antiproton antineutrino
25 Charge on neutron is 1.6 x 10<sup>-19</sup>C zero -1.6 x 10<sup>-19</sup>C 1.2 x 10<sup>-19</sup>C
26 In 1932 Chadwick discovered proton neutron photon electron
27 Neutron was discovered by Curie Roentgen Chadwick Rutherford
28 Neutron was discovered in 1915 1920 1925 1932
29 Proton was discovered by Rutherford in 1915 1906 1910 1920
30 According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the number of photoelectrons size of the photoelectrons charge on photoelectrons K.E of photoelectrons
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