ECAT Physics Online Test With Answers

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ECAT Physics Online Test

Sr. # Questions Answers Choice
1 Above the curie temperature, iron becomes ferromagnetic paramagnetic diamagnetic any one of them
2 Ferromagnetic substances lose their magnetism when heated above a certain temperature, known as critical temperature curie temperature high temperature fixed temperature
3 Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as ON switch off switch function switch none of these
4 Which of these is not a radiation detector Wilson cloud chamber cyclotron acceleration Geiger Miller counter solid state detector
5 When a charged particle passes through matter, it produces ionization, this effect is used in fission reaction reactor radiation detector fusion reaction
6 Radiation detector are used to measure intensity of radiation measure energy of radiation difference between different types of radiation all the above
7 Pair production take place when energy ofγ-rays photon is equal to 1.02 Mev- greater than 1.02 Mev less than 1.02 Mev none of these
8 γ-rays behave like a particle because they explain the Compton effect Photoelectric effect Pair-production all the above
9 γ-rays are electrostatic waves electromagnetic waves heavy particles longitudinal waves
10 The penetration power ofβ-particle is zero less than<span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: small;">α-particle</span> equal to<span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: small;">α-particle</span> greater than<span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: small;">α-particle</span>
11 The range ofβ-particle in air is greater than that ofα-particle by 1000 times 100 times 15 times 10 times
12 β-particles are easily deflected by collisions than heavy <span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: small;">α-particles</span> <span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: small;">β-particles</span> <span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: small;">γ-particles</span> none of these
13 How much time, theα-particle more massive than an electron 600 7000 5000 15000
14 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
15 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
16 Which of the following material has smaller has life uranium polonium radium radian
17 Which of the following material has longer half life radium polonium radium uranium
18 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
19 The half lie of radium-226 is 238 years 4.5 x 10<sup>9</sup>days 1620 years 332 years
20 The unit of decay constant is sex sec<sup>2</sup> sec<sup>-1</sup> sec<sup>-2</sup>
21 Fraction of the decaying atoms per unit time is called decay atom decay element decay constant decay
22 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
23 In radio-active decay, the original element which disintegrate to another element is called element daughter element parent element none of these
24 The emission of radiations take place in elements, having charge number greater than 109 82 69 52
25 The time required for a radioactive material to decrease in active by one half is called half time half life disintegration time mean life
26 The half life of radioactive substances depends upon amount of substance energy of substance state of substance temperature of substance
27 Different radioactive material have same half lives different half lives same mean lives same total lives
28 The rate of decay of a radioactive substance decrease exponentially with time decreases linearly with time increases linearly with time increases exponentially with time
29 After alpha decay the atomic number of the atom increase by four decreases by two increases by two decrease by four
30 When radioactive nucleus emits aβ-particle, the proton-neutron ratio decrease increase same none of these
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