STUDY NOTES       QUESTIONS WITHOUT ANSWERS 

 
1. Silicon in its pure form is:
   1. a conductor
   2. an insulator
   3. a superconductor
   4. a semiconductor
   ========= Answer is b =========
   
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
   ========= Answer is c =========
   
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
   ========= Answer is c =========
   
4. An atom that loses an electron becomes:
   1. a positive ion
   2. an isotope
   3. a negative ion
   4. a radioactive atom
   ========= Answer is a =========
   
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
   ========= Answer is b =========
   
6. These magnetic poles repel:
   1. unlike
   2. like
   3. positive
   4. negative
   ========= Answer is b =========
   
7. This material is better for making a permanent magnet:
   1. steel
   2. copper
   3. aluminium
   4. soft iron
   ========= Answer is a =========
   
8. The better conductor of electricity is:
   1. copper
   2. carbon
   3. silicon
   4. aluminium
   ========= Answer is a =========
   
9. The term describing opposition to electron flow in a metallic circuit is:
   1. current
   2. voltage
   3. resistance
   4. power
   ========= Answer is c =========
   
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
    ========= Answer is b =========
    
11. The plastic coating formed around wire is:
    1. an insulator
    2. a conductor
    3. an inductor
    4. a magnet
    ========= Answer is a =========
    
12. The following is a source of electrical energy:
    1. p-channel FET
    2. carbon resistor
    3. germanium diode
    4. lead acid battery
    ========= Answer is d =========
    
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
    ========= Answer is c =========
    
14. As temperature increases, the resistance of a metallic conductor:
    1. increases
    2. decreases
    3. remains constant
    4. becomes negative
    ========= Answer is a =========
    
15. In an n-type semiconductor, the current carriers are:
    1. holes
    2. electrons
    3. positive ions
    4. photons
    ========= Answer is b =========
    
16. In a p-type semiconductor, the current carriers are:
    1. photons
    2. electrons
    3. positive ions
    4. holes
    ========= Answer is d =========
    
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
    ========= Answer is b =========
    
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
    ========= Answer is d =========
    
19. Three good electrical conductors are:
    1. copper, gold, mica
    2. gold, silver, wood
    3. gold, silver, aluminium
    4. copper, aluminium, paper
    ========= Answer is c =========
    
20. The name for the flow of electrons in an electric circuit is:
    1. voltage
    2. resistance
    3. capacitance
    4. current
    ========= Answer is d =========