MDCAT Physics MCQ's Test With Answers

MDCAT Physics MCQ's Test

Sr. # Questions Answers Choice
1 The field of a long bar magnet is like a Two pole pieces of magnet Solenoid Toroid None of these
2 The magnetic fields are produced by the  Moving charges Bar magnets Motion of conductor in a magnetic field All of them
3 The technological uses of superconductors are MRI Magnetic levitation trains Faster computer chips All of them
4 High temperature superconductors have temperature Above 77 K Below 77 K At 77 K None of these
5 In 1986 a new class of ceramic material was discovered at temperature as high as  19 K 78 K 108 K 12 K
6 The critical temperature Tc for lead is 5.4 K 6.3 K 6.9 K 7.2 K
7 The critical temperature T for is 1.6 K 2.71 K 3.72 K 2.82 K
8 The critical temperature Tc for Aluminium is 2.1 K 1.1 K 1.18 K 1.19 K
9 The electrical resistance of mercury disappeared below temeprature 2.1 K 3.4 K 4.1 K 4.2 K
10 The first superconductor was discovered by Fermi Kmaerlinghormes  Weinberg None of these
11 The first superconductor was discovered in 1905 1911 19161 1920
12 The current once established, does not require Current source Source of emf Induced current None of these
13 In super conductors, once the current is established it exists  1 day 30 days indefinitely  None of these
14 In superconductors, the resistance of a material drops to zero and no Power is dissipated  Energy is dissipated  Current is dissipated  None of these
15 Super conductor offers no resistance to Thermal agitation Electric current Induced current None of these
16 Super conductors are materials like Alloys Ceramic Semiconductors  a and b
17 Super conductors are the those materials whose resistivity becomes zero below certain temperature called Curie temperature Fixed temperature Critical temperature None of these
18 In semiconductor Si or Ge a missing electron in covalent bond from an atom is a Charged atom Hole Ion All of them
19 When a silicon crystal is doped with trivalent impurity which are  Indium  Arsenic  Phosphorous  None of these 
20 When a silicon crystal is doped with pentavalent impurity which are Boron Antimony  Gallium None of these
21 The each atom of pure Ge or Si shares neighboring electrons are Three Four Five None of these
22 Doping is the process in which the small amount of impurity is added into pure semiconductor lattice in the ratio 1 to 10<sup>3</sup> 1 to 10<sup>4</sup> 1 to 10<sup>5</sup> 1 to 10<sup>6</sup>
23 The electrical behavior of semiconductor depends on the material purity which is Sensitive Extremely sensitive&nbsp; Non-sensitive&nbsp; None of these
24 A semiconductor in its extremely pure form in known as Extrinsic semiconductor Intrinsic semiconductor Both a and b None of these
25 Semiconductors, like Ge or Si at room temperature becomes a Semiconductor Conductor Insulator None of these
26 The valency of electron in the valence band is known as Atom Molecule Hole None of these
27 At 0 K a piece of Ge and Si is a perfect Conductor Insulator Semiconductor None of these
28 In semiconductors at 0 K the valence band is Completely filled Partially filled&nbsp; No Yes
29 In semiconductors, at 0 K, the electrons in conduction band is Partially filled No Yes None of these
30 The energy gap between conduction band and valence band is semiconductor is A very narrow forbidden energy gap A narrow forbidden gap Of the order of 1 eV a and b
31 In semiconductors, the valence band at room temperature is Completely filled Partially filled Empty None of these
32 In terms of energy bands, semiconductors are those materials which at room temperature have conduction band Partially filled Full filled Slightly filled None of these
33 Is there any physical distinction between the valence and conduction band Yes No Very small None of these
34 In conductors, the valence band and conduction bands are Touch each other Overlapped each other Largely overlapped None of these
35 Conductors are those materials in which the free electrons Very large Very small Plenty of&nbsp; None of these
36 The energy gap is insulators becomes very large and has the value Few electron volt (eV) Some electron volt (eV) Several electron volt (eV) None of these
37 In Insulators the conduction band is Empty Partially filled Full None of these
38 Insulators are those materials in which valence band is Empty Partially filled Full None of these
39 Insulators are those materials which valence electrons are bound Loosely&nbsp; Tightly Very tightly None of these
40 The conduction of electrons takes place and conduct electric current through solids is a Energy band Conduction band Valence band Completely filled band
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