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WorksheetsELECTRONIC
Total questions: 20
Worksheet time: 20mins
The strenght of a semiconductor crystal comes from......
Forces between protons
Electron pair bond
Forces between nuclei
When a pure semiconductor is heated, its resistance (a) .
The resistivity of a pure silicon is about .................. .
100 Ω cm
6 x 10-8 Ω cm
6000 Ω cm
The random motion of holes and free electrons due to thermal agitation is called ......... .
Ionisation
Diffusion
Pressure
A foward biased pn juction diode a resistance of the order of ................. .
MΩ
Ω
kΩ
An ammater is connected in ................. with the circuit element whose current we wish to measure.
Parallel
Series or parallel
Series
A voltmeter should have (a) resistance .
Two multimeter C and D have sentivities of 10 kΩ/V and 30 kΩ/V respectively. Then ............. .
Multimeter C is more sensitive
Multimeter D is more sensitive
Both are equally sensitive
An ideal ammeter has ................ resistance .
Zero
High
Infinite
Addition of pentavalent impurity to a semiconductor creates many ............. .
Bound electrons
Valence electrons
Free electrons
At absolute temperature, an intrinsic semiconductor has (a) .
In the depletion region of a pn junction, there is a shortage of ................ .
Donor ions
Holes and electrons
Acceptor ions
When the temperature of an extrintic semiconductor is increased, the pronounced effect is on ................ .
Majority carriers
Junction capacitance
Minority carriers
An n-type semiconductor is ............ .
Negatively charged
Electrically neutral
Positively charged
A trivalent impurity has ................ valence electrons .
1
3
7
A hole in semiconductor is defined as ................. .
Incomplete part of an electron pair bond
Free proton
Free neutron
A semiconductor is formed by .............. bonds.
Co-ordinate
Electrovalent
Covalent
A semiconductor has (a) temperature coefficient of resistance.
In an intrinsic semiconductor, the number of free electrons (a) .
Under normal conditions a diode conducts current when it is ................. .
forward biased
reverse biased
saturated
