11) As the doping to a pure semiconductor increases, the bulk resistance of the semiconductor ………..
a) Remains the same
b) Increases
c) Decreases
d) None of the above
12)An LED made using GaAs emits radiation
a) Visible region
b) Ultraviolet region
c) Infrared region
d) Microwave frequency region
13) Doping is a process of :
(a) purifying semiconductor material
(b) increasing impurity percentage
(c) removal of foreign atoms
(d) increasing the bias potential
14) Which one of the following materials is a ceramic material ?
a) Mica
b) Zinc sulphide
c) Antimony
d) Copper
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15) Which one of the following statements is correct ? lonic crystals are
a) hard and brittle
b) soft and elastic
c) hard and corrosive
d) soft and inflammable
16) When does BaTiO3 lose its ferroelectric properties ?
a) Above 0ok
b) Above its Curie point
c) Above room temperature
d) Above its melting point
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17) Metal film resistors are made by depositing a very thin layer of metal on a
a) metal rod
b) Bakelite sheet
c) Ceramic rod
d) metal sheet
18) A hetero-structure laser is better than a diode laser (injection laser) because of its
a) Low cost
b) Long wavelength emission
c) Low threshold current
d) Non-linear operation
19) Which material is used is used for making permanent magnet ?
a) Carbon steel
b) Germanium
c) Silicon
d) None of the above
20) How much (approximate) is the frequency independent power factor of a plastic dielectric capacitor ?
a) 0.00002
b) 0.0002
c) 0.002
d) 0.02
21) Ceramic resonators use which one of the following ?
a) Barium titanate
b) Silicon
c) Piezo-electric quartz crystal
d) Zirconium titanate
22) Which one of the following materials is not a piezoelectric material ?
a)BaTiO3
b) Quartz
c) Rochelle salt
d) Yttrium garnet
23) Which of the following is not a conducting material ?
a) Copper
b) Tungsten
c) Germanium
d) Platinum
24) Which one of the following is a trivalent material ?
a) Antimony
b) phosphorus
c) Arsenic
d) Boron
25) Which of the following materials is not an insulator ?
a) diamond
b) Graphite
c) Bakelite
d) Lucite
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