STUDY NOTES       QUESTIONS WITH ANSWERS 

 
1. Silicon in its pure form is:
   1. a conductor
   2. an insulator
   3. a superconductor
   4. a semiconductor
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2. An element which falls somewhere between being an insulator and a conductor is called a:
   1. P-type conductor
   2. intrinsic conductor
   3. semiconductor
   4. N-type conductor
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3. In an atom:
   1. the protons and the neutrons orbit the nucleus in opposite directions
   2. the protons orbit around the neutrons
   3. the electrons orbit the nucleus
   4. the electrons and the neutrons orbit the nucleus
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4. An atom that loses an electron becomes:
   1. a positive ion
   2. an isotope
   3. a negative ion
   4. a radioactive atom
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5. An electric current passing through a wire will produce around the conductor:
   1. an electric field
   2. a magnetic field
   3. an electrostatic field
   4. nothing
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6. These magnetic poles repel:
   1. unlike
   2. like
   3. positive
   4. negative
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7. This material is better for making a permanent magnet:
   1. steel
   2. copper
   3. aluminium
   4. soft iron
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8. The better conductor of electricity is:
   1. copper
   2. carbon
   3. silicon
   4. aluminium
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9. The term describing opposition to electron flow in a metallic circuit is:
   1. current
   2. voltage
   3. resistance
   4. power
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10. The substance which will most readily allow an electric current to flow is:
    1. an insulator
    2. a conductor
    3. a resistor
    4. a dielectric
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11. The plastic coating formed around wire is:
    1. an insulator
    2. a conductor
    3. an inductor
    4. a magnet
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12. The following is a source of electrical energy:
    1. p-channel FET
    2. carbon resistor
    3. germanium diode
    4. lead acid battery
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13. An important difference between a common torch battery and a lead acid battery is that only the lead acid battery:
    1. has two terminals
    2. contains an electrolyte
    3. can be re-charged
    4. can be effectively discharged
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14. As temperature increases, the resistance of a metallic conductor:
    1. increases
    2. decreases
    3. remains constant
    4. becomes negative
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15. In an n-type semiconductor, the current carriers are:
    1. holes
    2. electrons
    3. positive ions
    4. photons
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16. In a p-type semiconductor, the current carriers are:
    1. photons
    2. electrons
    3. positive ions
    4. holes
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17. An electrical insulator:
    1. lets electricity flow through it in one direction
    2. does not let electricity flow through it
    3. lets electricity flow through it when light shines on it
    4. lets electricity flow through it
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18. Four good electrical insulators are:
    1. plastic, rubber, wood, carbon
    2. glass, wood, copper, porcelain
    3. paper, glass, air, aluminium
    4. glass, air, plastic, porcelain
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19. Three good electrical conductors are:
    1. copper, gold, mica
    2. gold, silver, wood
    3. gold, silver, aluminium
    4. copper, aluminium, paper
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20. The name for the flow of electrons in an electric circuit is:
    1. voltage
    2. resistance
    3. capacitance
    4. current
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