MDCAT Physics MCQ's Test With Answers

MDCAT Physics MCQ's Test

Sr. # Questions Answers Choice
1 The magnetism produced by electrons within an atom can arise from electrons orbiting the nucleus electrons orbiting the nucleus both motions none one these motions
2 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
3 Any superconductor with critical temperature above 77 K, is referred as low temperature superconductor high temperature superconductor very low temperature superconductor none of them
4 The critical temperature of lead is 1.18 K 4.2 K 3.72 K 7.2 K
5 The critical temperature of tin is 1.18 K 4.2 K 3.72 K 7.2 K
6 The critical temperature of aluminum is 1.18 K 4.2 K 3.72 K 7.2 K
7 The critical temperature of mercury is 1.18 K 4.2 K 3.72 K 7.2 K
8 There are some materials 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
9 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
10 In a semi-conductor material, current flows due to positive charge negative charge both of them none of them
11 Whenever a covalent bond is broken in an intrinsic semi-conductor hole is created an electron is created an electron hole is generated all of them
12 When a silicon crystal is doped with a trivalent element, then the atom of the trivalent element is known as acceptor donor either of them none of them
13 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
14 A hole in a semi-conductor material is treated as positive charge negative charge neutral none of them
15 When a silicon crystal is doped with a trivalent element, such an extrinsic semi-conductor is called p-type semi-conductor n-type semi-conductor either of them none of them
16 When a sillicon 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
17 Arsenic, antimony and phosphorous are the elements from third group fourth group fifth group none of them
18 The bonding between the semi-conductor materials is covalent ionic either of them none of them
19 Semi-conductor elements have atoms with 2 valence electrons 3 valence electrons 4 valence electrons 5 valence electrons
20 The doped semi-conductors materials are known as intrinsic semi-conductor extrinsic semi-conductor either of them none of them
21 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>
22 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
23 A semi conductor in its extremely pure from is known as extrinsic semi-conductor intrinsic semi-conductor either of them none of them
24 Conductors are those materials in which energy gap is very large (several eV) very narrow (= 1eV) either of them none of them
25 Insulators are those material in which energy gap is very large (several eV) very narrow (= 1ev) either of them none of them
26 The materials in which there are plenty of free electrons for electrical conduction are known as conductors insulators semi-conductors all of them
27 The materials in which valence electrons are bound very tightly to their atoms and are not free, are known as conductors insulators semi-conductors all of them
28 The bands below the valence band are completely filled and play active part in conduction process completely filled and plays no part in conduction process not completely filled and play active part in conduction process not completely filled and play no part in conduction process
29 The conduction band in a solid may be empty cannot be empty should be filled all of them
30 The electrons occupying the conduction band are known as conduction electrons free electrons both of them none of them
31 The band above the valence band is called high energy band conduction band empty band none of them
32 The valence band of an atom in a solid is always empty may or may not be empty can never be empty none of them
33 When a large number of atoms are brought close to one another to form a solid, each energy level of an isolated atom splits into sub-levels, called energy bands energy shells states all of them
34 Electrons of an isolated atom are bound to the nucleus, and? can only have distinct energy level can only have same energy level may or may not have distinct energy none of them
35 Which of the following theory completely explain the three types of materials? Bohr model of electron distribution Rutherford atomic model Pauli's exclusion principle energy band theory
36 The electrical conductivities of insulators are ranging from 10<sup>-5</sup>to 10<sup>-10 </sup>(<span style="color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 224);"><b>Ω m)</b><sup>-1</sup></span> 10<sup>-10</sup>to 10<sup>-15</sup>(<span style="font-family: &quot;Times New Roman&quot;; font-size: 24px; color: rgb(34, 34, 34); text-align: center; background-color: rgb(255, 255, 224);"><b>Ω m)</b><sup>-1</sup></span> 10<sup>-5</sup>to 10<sup>-15</sup>(<span style="font-family: &quot;Times New Roman&quot;; font-size: 24px; color: rgb(34, 34, 34); text-align: center; background-color: rgb(255, 255, 224);"><b>Ω m)</b><sup>-1</sup></span> 10<sup>-10</sup>to 10<sup>-20</sup>(<span style="font-family: &quot;Times New Roman&quot;; font-size: 24px; color: rgb(34, 34, 34); text-align: center; background-color: rgb(255, 255, 224);"><b>Ω m)</b><sup>-1</sup></span>
37 Metals are good conductors of electricity and their conductivities are of the order of 10<sup>3</sup>(<span style="color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 224);"><b>Ω m)<sup>-1</sup></b></span> 10<sup>4</sup>(<span style="font-family: &quot;Times New Roman&quot;; font-size: 24px; color: rgb(34, 34, 34); text-align: center; background-color: rgb(255, 255, 224);"><b>Ω m)<sup>-1</sup></b></span> 10<sup>6</sup>(<span style="font-family: &quot;Times New Roman&quot;; font-size: 24px; color: rgb(34, 34, 34); text-align: center; background-color: rgb(255, 255, 224);"><b>Ω m)<sup>-1</sup></b></span> 10<sup>7</sup>(<span style="font-family: &quot;Times New Roman&quot;; font-size: 24px; color: rgb(34, 34, 34); text-align: center; background-color: rgb(255, 255, 224);"><b>Ω m)<sup>-1</sup></b></span>
38 Lead, copper and wrought iron are examples of brittle substances ductile substances plastic substances elastic substances
39 Glass and high carbon steel are the examples of brittle substances ductile substances plastic substances elastic substances
40 The substances which break just after the elastic limit is reached, are known as brittle substances ductile substances plastic substances elastic substances
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