ECAT Physics Online Test With Answers

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ECAT Physics Online Test

Sr. # Questions Answers Choice
1 Within each domain, the magnetic field of all the spinning electrons are parallel antiparallel perpendicular all of them
2 The size of the domain is such that they can contain 10<sup>2</sup>to 10<sup>4</sup>atoms 10<sup>4</sup> to 10<sup>8</sup>atoms 10<sup>8</sup>to 10<sup>12</sup>atoms 10<sup>12</sup>to 10<sup>16</sup>atoms
3 The domains are of macroscopic size of the order of centimeters meters millimeters nanomneters
4 Recent studies of ferromagnetism have shown that there exists in ferromagnetic substances small regions called tiny regions domains vectors none of them
5 The substance in which atoms cooperate with each other in such a way so as to exhibit a strong magnetic effect, are called diamagnetic substances ferromagnetic substances paramagnetic substances all of them
6 The substance in which atoms are so oriented that the field produced by spin and orbital motion of the electrons might add up to zero,are called diamagnetic substances ferromagnetic substances paramagnetic substances all of them
7 The substances in which, atom are so oriented that their fields support each other and the atoms behave like tiny magnets, are called diamagnetic substances ferromagnetic substances paramagnetic substances all of them
8 The charged nucleus of an atom itself spins its magnetic field equal to the field produced by orbital electrons greater than the field produced by orbital electrons much weaker than the field produced by orbital electrons none of these
9 An atom in which there is a resultant magnetic field, behaves like a tiny magnet and is called as magnetic magnetic dipole magnetic monopole none of them
10 The magnetism produced by electrons within an atom can arise from electrons orbiting the nucleus electrons posses a spin both motions none of these motions
11 Recently a complex crystalline structure known as Yetrium Barium Copper Oxide have been reported to become superconductor at 125 K 25 K 263 K 163 K
12 Any superconductor with critical temperature above 77 K, is referred as low temperature superconductor high temperature superconductor very low temperature superconductor none of them
13 The critical temperature of tin is 1.18 K 4.2 K 3.72 K 7.2 K
14 The critical temperature of aluminium is 1.18 K 4.2 K 3.72 K 7.2 K
15 The critical temperature of mercury is 1.18 K 4.2 K 3.72 K 7.2 K
16 The first super conductor was discovered in 1811 1890 1901 1911
17 There are some whose resistivity becomes zero below a certain temperature, called absolute zero 0<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span> critical temperature lower fixed point
18 In a semi-conductor material, the total current is only the +ve current only the electronic current sum of +ve and electronic current all of them
19 In a semi-conductor material, current flows due to positive charge negative charge both of them none of them
20 Whenever a covalent bond is broken in an intrinsic semi-conductor hole is created an electron is created an electron-hole pair is generated all of them
21 When a silicon crystal is doped with a pentavalent element, then the atom of the pentavalent element is known as acceptor donor either of them none of them
22 When a silicon crystal is doped with a pentavalent element, such an extrinsic semi-conductor is called p-type semi-conductor n-type semi-conductor either of them none of them
23 Arsenic, antimony and phosphorus are the elements from third group fourth group fifth group none of them
24 The bonding between the semi-conductor materials is covalent ionic either of them none of them
25 Semi-conductor elements have atoms with 2 valence electrons 3 valence electrons 4 valence electrons 5 valence electrons
26 The doped semi-conductor materials are known as intrinsic semi-conductor extrinsic semi-conductor either of them none of them
27 In the doping process, the ratio of the doping atoms to the semi conductor atom is 1 to 10 1 to 10<sup>3</sup> 1 to 10<sup>6</sup> 1 to 10<sup>9</sup>
28 When small number of atoms from some other suitable element is added to the semi-conductor material, then this process is known as impurification adding doping extrinsivity
29 Which type of wave can be set up in solids longitudinal waves transverse waves both of them none of them
30 The waves in which the particles of the medium have displacement along the direction of propagation of waves are called longitudinal waves transverse waves non-mechanical waves none of them
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