ECAT Pre General Science Physics Online Test With Answers

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ECAT Pre General Science Physics Online Test

Sr. # Questions Answers Choice
1 The range of particle depends upon the factor charge, mass and energy of particle density of medium ionization potential of the atoms all the above
2 The distance travelled byα-particle in a medium before coming to rest, is called range of<span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: small;">γ-particle</span> range of neutrons range of particle none of these
3 Which of the following material has smaller has life uranium polonium radium radian
4 Which of the following material has longer half life radium polonium radium uranium
5 The half life of uranium-238 is 6.2 x 10<sup>9</sup>years 4.5 x 10<sup>9</sup>days 4.5 x 10<sup>9</sup>years 1.3 x 10<sup>6</sup>years
6 The half lie of radium-226 is 238 years 4.5 x 10<sup>9</sup>days 1620 years 332 years
7 The unit of decay constant is sex sec<sup>2</sup> sec<sup>-1</sup> sec<sup>-2</sup>
8 Fraction of the decaying atoms per unit time is called decay atom decay element decay constant decay
9 In radioactive decay, the new element which is formed due to the disintegration of original element is called element daughter element parent element none of these
10 In radio-active decay, the original element which disintegrate to another element is called element daughter element parent element none of these
11 The emission of radiations take place in elements, having charge number greater than 109 82 69 52
12 The time required for a radioactive material to decrease in active by one half is called half time half life disintegration time mean life
13 The half life of radioactive substances depends upon amount of substance energy of substance state of substance temperature of substance
14 Different radioactive material have same half lives different half lives same mean lives same total lives
15 The rate of decay of a radioactive substance decrease exponentially with time decreases linearly with time increases linearly with time increases exponentially with time
16 After alpha decay the atomic number of the atom increase by four decreases by two increases by two decrease by four
17 When radioactive nucleus emits aβ-particle, the proton-neutron ratio decrease increase same none of these
18 Phenomenon of radioactivity is due to disintegration of nucleus neutron proton molecule
19 A curie represents a very strong source of <span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: small;">α-particle</span> <span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: small;">β-particle</span> <span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: small;">γ-particle</span> none of these
20 The rate of decay of radioactive substance is constant decrease exponentially with time varies inversely as time decreases linearly with time
21 The energy of the 4th orbit in hydrogen atom is 2.5 ev - 3.5 ev -0.85 ev -13.6 ev
22 Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of photoelectric effect pair production Compton effect uncertainty principle
23 de-Broglies hypthesis was experimentally verified by Maxwell Compton Einstein Davison and Germer
24 G.P. Thomson observer experimentally that electrons and neutrons possess particle-like properties wave-like properties neither particle nor wave like properties none of these
25 Davision and Germer performed experiment to verify de-Brogile hypothesis theory of relativity Newton's law of gravitation Mass-energy relation
26 Wave nature of particle was proposed by Einstein Plank De-Brogile Max well
27 Momentum is a parameter associated with wave motion particle motion neither wave nor particle motion none of these
28 With the help of 50 K v electron microscope, a resolution of 0.5 to 1 m to possible 1 m to 10 m is possible 0.5 to 1 nm is possible 1 to 10 nm is possible
29 Which of the following phenomenon proves the particle nature of light interference diffraction photoelectric effect none of these
30 An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is 1.66 x 10<sup>-29</sup>m 1.74 x 10<sup>-10</sup>cm 17.4 x 10<sup>-6</sup>m 1.74 x 10<sup>-10</sup>m
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