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265 lines
3.3 KiB
Plaintext
265 lines
3.3 KiB
Plaintext
% FILENAME = N3.TXT
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% Electronics Fundamentals
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% Release version 3, October 2001
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% Question 3.7 replaced 9 Aug 2012
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% Question: 1
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#3.1 The element Silicon is:
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a conductor
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an insulator
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a superconductor
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a semiconductor
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% ans 4
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% Question: 2
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#3.2 An element which falls somewhere between being an insulator and a conductor is called a:
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P-type conductor
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intrinsic conductor
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semiconductor
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N-type conductor
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% ans 3
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% Question: 3
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#3.3 In an atom:
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the protons and the neutrons orbit the nucleus in opposite directions
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the protons orbit around the neutrons
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the electrons orbit the nucleus
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the electrons and the neutrons orbit the nucleus
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% ans 3
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% Question: 4
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#3.4 An atom that loses an electron becomes:
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a positive ion
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an isotope
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a negative ion
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a radioactive atom
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% ans 1
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% Question: 5
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#3.5 An electric current passing through a wire will produce around the conductor:
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an electric field
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a magnetic field
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an electrostatic field
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nothing
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% ans 2
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% Question: 6
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#3.6 These magnetic poles repel:
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unlike
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like
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positive
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negative
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% ans 2
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% Question: 7
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#3.7 A common use for a magnet is in:
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A computer speaker
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An optical mouse
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A keyboard
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A magnetic loop antenna
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% ans 1
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% Question: 8
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#3.8 The better conductor of electricity is:
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copper
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carbon
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silicon
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aluminium
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% ans 1
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% Question: 9
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#3.9 The term describing opposition to electron flow in a metallic circuit is:
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current
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voltage
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resistance
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power
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% ans 3
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% Question: 10
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#3.10 The substance which will most readily allow an electric current to flow is:
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an insulator
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a conductor
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a resistor
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a dielectric
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% ans 2
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% Question: 11
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#3.11 The plastic coating formed around wire is:
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an insulator
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a conductor
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an inductor
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a magnet
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% ans 1
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% Question: 12
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#3.12 The following is a source of electrical energy:
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p-channel FET
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carbon resistor
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germanium diode
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lead acid battery
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% ans 4
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% Question: 13
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#3.13 An important difference between a common torch battery and a lead acid battery is that only the lead acid battery:
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has two terminals
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contains an electrolyte
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can be re-charged
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can be effectively discharged
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% ans 3
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% Question: 14
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#3.14 As temperature increases, the resistance of a metallic conductor:
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increases
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decreases
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remains constant
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becomes negative
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% ans 1
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% Question: 15
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#3.15 In an n-type semiconductor, the current carriers are:
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holes
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electrons
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positive ions
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photons
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% ans 2
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% Question: 16
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#3.16 In a p-type semiconductor, the current carriers are:
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photons
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electrons
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positive ions
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holes
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% ans 4
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% Question: 17
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#3.17 An electrical insulator:
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lets electricity flow through it in one direction
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does not let electricity flow through it
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lets electricity flow through it when light shines on it
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lets electricity flow through it
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% ans 2
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% Question: 18
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#3.18 Four good electrical insulators are:
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plastic, rubber, wood, carbon
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glass, wood, copper, porcelain
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paper, glass, air, aluminium
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glass, air, plastic, porcelain
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% ans 4
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% Question: 19
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#3.19 Three good electrical conductors are:
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copper, gold, mica
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gold, silver, wood
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gold, silver, aluminium
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copper, aluminium, paper
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% ans 3
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% Question: 20
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#3.20 The name for the flow of electrons in an electric circuit is:
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voltage
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resistance
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capacitance
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current
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% ans 4
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