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 rate of decay of a radioactive substance decrease exponentially with time decreases linearly with time increases linearly with time increases exponentially with time
2 After alpha decay the atomic number of the atom increase by four decreases by two increases by two decrease by four
3 When radioactive nucleus emits aβ-particle, the proton-neutron ratio decrease increase same none of these
4 Phenomenon of radioactivity is due to disintegration of nucleus neutron proton molecule
5 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
6 The rate of decay of radioactive substance is constant decrease exponentially with time varies inversely as time decreases linearly with time
7 The energy of the 4th orbit in hydrogen atom is 2.5 ev - 3.5 ev -0.85 ev -13.6 ev
8 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
9 de-Broglies hypthesis was experimentally verified by Maxwell Compton Einstein Davison and Germer
10 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
11 Davision and Germer performed experiment to verify de-Brogile hypothesis theory of relativity Newton's law of gravitation Mass-energy relation
12 Wave nature of particle was proposed by Einstein Plank De-Brogile Max well
13 Momentum is a parameter associated with wave motion particle motion neither wave nor particle motion none of these
14 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
15 Which of the following phenomenon proves the particle nature of light interference diffraction photoelectric effect none of these
16 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
17 A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is 1.66 m 1.66 x 10<sup>-10</sup>m 1.66 x 10<sup>-29</sup>cm 1.66 x 10<sup>-29</sup>m
18 Victor de-Brogile received the Nobel prize in physics in 1925 1929 1932 1935
19 0.1 kg mass will be equivalent to the energy 9 x 10<sup>15</sup>J 5 x 10<sup>8</sup>J 6 x 10<sup>16</sup>J 9 x 10<sup>-16</sup>J
20 The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is 100 J 1.6 x 10<sup>-17</sup>J 100 eV 1.6 x 10<sup>-17</sup>eV
21 According to the de-Brogile relation, an object of large mass and ordinary speed has very small wavelength very large wavelength very small frequency all of these
22 Photocell is a device which converts chemical energy into electrical energy electrical energy into light energy heat energy into electrical energy light energy into electrical energy
23 In process of annihilation of matter, the two photons produced move in opposite direction to converse momentum charge energy mass
24 Pair production is the phenomenon in which matter is converted into energy energy is converted into matter light is converted into electrical energy electrical energy is converted into light
25 Position was discovered by Carl Anderson in 1920 1925 1928 1932
26 The existence of position was predicted by Dirace in 1920 1925 1930 1928
27 When a position comes close to an electron they annihilate into photons such that each photon has energy 0.51 Me v each photon has energy 1.02 Me v each photon has energy 0.25 Me v none of these
28 When a position comes close to an electron they annihilate into one photon two photons which travel in the same direction two photons which travels in the opposite direction two photons which travel in any direction
29 Converse of pair production is known as Compton effect annihilation of matter photoelectric effect none of these
30 In order to produce pair production, a photon must have a energy 0.511 Me v 0.256 Me v 1.02 Me v 0.956 Me v
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