ECAT Physics Online Test With Answers

image
image
image

ECAT Physics Online Test

Sr. # Questions Answers Choice
1 Rutherford performed an experiment on nuclear reactions in: 1718 A.D 1818 A.D 1918 A.D 2001 A.D. 1701 A.D.
2 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
3 In wilson cloud chamber, the air becomes saturated with: Alcohol vapours Water Helium gas Nitrogen gas None of these
4 The unit of decay constant is: Second Metre Hour Year Second<sup>-1</sup>
5 The reciprocal of decay constant λ of a radioactive material is: Frequency Half life Year Mean life None of these
6 Rate of decay is actually described by. Half line Decay constant Mean life Total life None of these
7 When thorium nucleus emits aβ-particle, the daughter nucleus is called: Protactinium Actinium Uranium Radium Redon
8 When certain nucleus emits aβ-particles, is mass number: Remain same Increases by one Decreases by one Decreases by four None of these
9 When certain nucleus emits anα particle, its mass number: Increases by one Decreases by one Remain same Decreases by four None of these
10 During the nuclear changes, the law/s of conservation that hold/s are that of: Charge energy Momentum Mass All of these
11 The nucleus left after the emission of some radiation is called: Parent nucleus Daughter necleus Mother necleus Any of these None of these
12 Marie curie and Pierre curie discovered: Uranium Polonium Radium Both (A) and (C) Plutonium
13 Radium was discovered by: Becquerel Marie curie Pierre curie Rutherford Both (B) and (C)
14 Radioactivity was discovered by: Becquerel Marie curie Pierre curie All of them None of these
15 Referring to the above figure, the binding energy per nucleon increases upto mass number equal to: 50 100 150 200 250
16 Referring to the above figure, we can say that of all the elements, the most stable element is Phosphours Iron uranium Lithium Bismuth
17 For Protium, the mass defect is: Infinite Zero Very large A few grams None of these
18 The nucleus/nuclei of hydrogen is/are: Proton Deuteron Triton All of these None of these
19 The isotope/s of hydrogen is /are: Protium Deuterium Tritium Both (A) and (B) All of these
20 The nuclei of an element having the same charge number but different mass numbers are called: Isobars Isotopes Isomers Isobaric Isothermal
21 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
22 The figure 1.007276μ shows the mass of an: Atom Positron Electron Neutron Proton
23 Nucleon means: Only electrons Only neutrons Only protons Both (A ) and (C) Both (B) and (C)
24 Neutron was disvovered by: Rutherford in 1920 Chadwick in 1922 Bohr in 1913 Compton in 1927 None of these
25 Neutron was suggested to be in the nucleus by: Rutherford in 1920 Bohar in 1913 Dirac in 1928 Anderson in 1932 None of these
26 The positron was discovered by: In cosmic radiation In 1932 By Carl Anderson All above By direc
27 A particle having mass and charge equal to that of an electron is called: Proton Positron Pion Pi-meson Both (C) and (D)
28 Photoelectric effect takes place with a photon of: Very high energy Very low energy Low energy High energy None of these
29 Compton shift refers to: Photon Meson Proton Positron Both (B) and (D)
30 The year when A.H. compton was awarded Nobel Prize is: 1923 1927 1931 1935 None of these
Download This Set
×