Physics ECAT Pre Engineering Chapter 17 Physics of Solid Online Test With Answers

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Physics ECAT Pre Engineering Chapter 17 Physics of Solid Online Test

Sr. # Questions Answers Choice
1 Any superconductor with critical temperature above 77 K, is referred as low temperature superconductor high temperature superconductor very low temperature superconductor none of them
2 The critical temperature of tin is 1.18 K 4.2 K 3.72 K 7.2 K
3 The critical temperature of aluminium is 1.18 K 4.2 K 3.72 K 7.2 K
4 The critical temperature of mercury is 1.18 K 4.2 K 3.72 K 7.2 K
5 The first super conductor was discovered in 1811 1890 1901 1911
6 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
7 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
8 In a semi-conductor material, current flows due to positive charge negative charge both of them none of them
9 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
10 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
11 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
12 Arsenic, antimony and phosphorus are the elements from third group fourth group fifth group none of them
13 The bonding between the semi-conductor materials is covalent ionic either of them none of them
14 Semi-conductor elements have atoms with 2 valence electrons 3 valence electrons 4 valence electrons 5 valence electrons
15 The doped semi-conductor materials are known as intrinsic semi-conductor extrinsic semi-conductor either of them none of them
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