ECAT Pre General Science Online Test With Answers

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ECAT Pre General Science Online Test

Sr. # Questions Answers Choice
1 Significant figures in 0.2020 are: Two Three Four Five
2 0.0001210 has ____________ significant figures. Four Three Seven Eight
3 Three quarks make: An electron A meson A baryon A photon None of these
4 A pair of quark and antiquark makes a: Meson Baryon Proton Neutron None of these
5 Which are not the elementary particles? Photons Leptons Hadrons Quarks None of these
6 U-238 present in the natural uranium is about: 59% 0.007% 99% 39% 19%
7 Heavy water is made of one oxygen atom and two atoms of: Protium Deuterium Tritium Any of these None of these
8 Examples of moderators used in a fission reactor is/are: Water Heavy water Carbon Hydrocarbon All of these
9 There is present in paraffin a large amount of: Nitrogen Hydrogen Carbon Baryllium Lithium
10 A mass difference of 0.0012 u is equivalent to and energy of: 0.5 Me V 1.13 MeV 5.13 MeV 1.13 keV 1.13 eV
11 In his experiment on nuclear reactions, Rutherford bombardedα particles on: Nitrogen Hydrogen Lead Oxygen Krypton
12 Rutherford performed an experiment on nuclear reactions in: 1718 A.D 1818 A.D 1918 A.D 2001 A.D. 1701 A.D.
13 The counter, which also provides the power to the G.M. tube is called: Thin mica window thin glass window Airy window Wooden window None of these
14 In wilson cloud chamber, the air becomes saturated with: Alcohol vapours Water Helium gas Nitrogen gas None of these
15 The unit of decay constant is: Second Metre Hour Year Second<sup>-1</sup>
16 The reciprocal of decay constant λ of a radioactive material is: Frequency Half life Year Mean life None of these
17 Rate of decay is actually described by. Half line Decay constant Mean life Total life None of these
18 When thorium nucleus emits aβ-particle, the daughter nucleus is called: Protactinium Actinium Uranium Radium Redon
19 When certain nucleus emits aβ-particles, is mass number: Remain same Increases by one Decreases by one Decreases by four None of these
20 When certain nucleus emits anα particle, its mass number: Increases by one Decreases by one Remain same Decreases by four None of these
21 During the nuclear changes, the law/s of conservation that hold/s are that of: Charge energy Momentum Mass All of these
22 The nucleus left after the emission of some radiation is called: Parent nucleus Daughter necleus Mother necleus Any of these None of these
23 Marie curie and Pierre curie discovered: Uranium Polonium Radium Both (A) and (C) Plutonium
24 Radium was discovered by: Becquerel Marie curie Pierre curie Rutherford Both (B) and (C)
25 Radioactivity was discovered by: Becquerel Marie curie Pierre curie All of them None of these
26 Referring to the above figure, the binding energy per nucleon increases upto mass number equal to: 50 100 150 200 250
27 Referring to the above figure, we can say that of all the elements, the most stable element is Phosphours Iron uranium Lithium Bismuth
28 For Protium, the mass defect is: Infinite Zero Very large A few grams None of these
29 The nucleus/nuclei of hydrogen is/are: Proton Deuteron Triton All of these None of these
30 The isotope/s of hydrogen is /are: Protium Deuterium Tritium Both (A) and (B) All of these
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