Physics ECAT Pre Engineering MCQ's Test For Full Book With Answers

Physics ECAT Pre Engineering MCQ's Test For Full Book

Sr. # Questions Answers Choice
1 The unit of decay constant is: Second Metre Hour Year Second<sup>-1</sup>
2 The reciprocal of decay constant λ of a radioactive material is: Frequency Half life Year Mean life None of these
3 Rate of decay is actually described by. Half line Decay constant Mean life Total life None of these
4 When thorium nucleus emits aβ-particle, the daughter nucleus is called: Protactinium Actinium Uranium Radium Redon
5 When certain nucleus emits aβ-particles, is mass number: Remain same Increases by one Decreases by one Decreases by four None of these
6 When certain nucleus emits anα particle, its mass number: Increases by one Decreases by one Remain same Decreases by four None of these
7 During the nuclear changes, the law/s of conservation that hold/s are that of: Charge energy Momentum Mass All of these
8 The nucleus left after the emission of some radiation is called: Parent nucleus Daughter necleus Mother necleus Any of these None of these
9 Marie curie and Pierre curie discovered: Uranium Polonium Radium Both (A) and (C) Plutonium
10 Radium was discovered by: Becquerel Marie curie Pierre curie Rutherford Both (B) and (C)
11 Radioactivity was discovered by: Becquerel Marie curie Pierre curie All of them None of these
12 Referring to the above figure, the binding energy per nucleon increases upto mass number equal to: 50 100 150 200 250
13 Referring to the above figure, we can say that of all the elements, the most stable element is Phosphours Iron uranium Lithium Bismuth
14 For Protium, the mass defect is: Infinite Zero Very large A few grams None of these
15 The nucleus/nuclei of hydrogen is/are: Proton Deuteron Triton All of these None of these
16 The isotope/s of hydrogen is /are: Protium Deuterium Tritium Both (A) and (B) All of these
17 The nuclei of an element having the same charge number but different mass numbers are called: Isobars Isotopes Isomers Isobaric Isothermal
18 Nucleus of a hydrogen atom may contain: One neutron only Two protons and one neutron Two protons and two neutrons Aany of above One proton only
19 The figure 1.007276μ shows the mass of an: Atom Positron Electron Neutron Proton
20 Nucleon means: Only electrons Only neutrons Only protons Both (A ) and (C) Both (B) and (C)
21 Neutron was disvovered by: Rutherford in 1920 Chadwick in 1922 Bohr in 1913 Compton in 1927 None of these
22 Neutron was suggested to be in the nucleus by: Rutherford in 1920 Bohar in 1913 Dirac in 1928 Anderson in 1932 None of these
23 The lasing or active medium in He-Ne laser discharge tube is: Nitrogen Helium Hydrogen Neon None of these
24 The spectrum emitted from hydrogen filled discharge tube is: Line spectrum Discrete spectrum And spectrum Absorption spectrum Both (A) and (B)
25 The He-Ne laser discharge tube is filled with: 85% He 15% He 50% He 60% He 85% Ne
26 A metastable stae: Is an excited state Is that in which excited electron is stable Is that in which excited electron is usually unstable Means a time interval of 10<sup>-8</sup>second Both (A) and (C)
27 Laser is a beam of: Visible light Infra red light Ultra violet light Violet light only yellow light only
28 By CAT scans, we can detect the density difference of the order of: 1% 20% 30% 50% 70%
29 The shell closer to the nucleus is called: N shell <div>L shell</div> K shell M shell O shell
30 An compared to solid matter, a crack or an air bubble allows: Great amount of X-rays to pass Smallast amount of X-rays to pass Very samall amount of X-rays to pass Any of these None of these
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