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 substances whose resistance decreases with the increase in temperature these substances have coefficient of positive temperature negative temperature absolute temperature zero temperature
2 In the phenomenon of hysteresis magnetism leads the magnetising current magnetism lags behind the magnetising current meganetism goes along the magnetising current none of them
3 The curie temperature of iron is about 250<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span> 500<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span> 750<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span> 1000<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span>
4 Above the curie temperature, iron becomes ferromagnetic paramagnetic diamagnetic any one of them
5 Ferromagnetic substances lose their magnetism when heated above a certain temperature, known as critical temperature curie temperature high temperature fixed temperature
6 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
7 Which of these is not a radiation detector Wilson cloud chamber cyclotron acceleration Geiger Miller counter solid state detector
8 When a charged particle passes through matter, it produces ionization, this effect is used in fission reaction reactor radiation detector fusion reaction
9 Radiation detector are used to measure intensity of radiation measure energy of radiation difference between different types of radiation all the above
10 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
11 γ-rays behave like a particle because they explain the Compton effect Photoelectric effect Pair-production all the above
12 γ-rays are electrostatic waves electromagnetic waves heavy particles longitudinal waves
13 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>
14 The range ofβ-particle in air is greater than that ofα-particle by 1000 times 100 times 15 times 10 times
15 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
16 How much time, theα-particle more massive than an electron 600 7000 5000 15000
17 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
18 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
19 Which of the following material has smaller has life uranium polonium radium radian
20 Which of the following material has longer half life radium polonium radium uranium
21 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
22 The half lie of radium-226 is 238 years 4.5 x 10<sup>9</sup>days 1620 years 332 years
23 The unit of decay constant is sex sec<sup>2</sup> sec<sup>-1</sup> sec<sup>-2</sup>
24 Fraction of the decaying atoms per unit time is called decay atom decay element decay constant decay
25 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
26 In radio-active decay, the original element which disintegrate to another element is called element daughter element parent element none of these
27 The emission of radiations take place in elements, having charge number greater than 109 82 69 52
28 The time required for a radioactive material to decrease in active by one half is called half time half life disintegration time mean life
29 The half life of radioactive substances depends upon amount of substance energy of substance state of substance temperature of substance
30 Different radioactive material have same half lives different half lives same mean lives same total lives
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