Introducing Capacitors, structure, use, calculating value

Which of these statements best describes a capacitor? A capacitor
1. Allows DC to pass through
2. Allows AC to pass through
3. Allows both AC and DC to pass through
4. Does not allow Ac or Dc to pass through
In a capacitor the dialectric
1. Is located on the outside of a metal plate.
2. Is a good conductor of electricity
3. Is sandwiched between two metal plates
4. Is a semi-conductor
Which of these increases the capacitance of a capacitor?
1. Decreasing the space between the plates
2. Decreasing the area of the plates
3. Increasing the thickness of the dialectric
4. Decreasing the dialectric constant (k) of the dialectric.
Which of these statements is true of electrolytic capacitors?
1. They can be connected either way round
2. They can only be connected one way round
3. They hold less charge than a non-electrolytic capacitor
4. In parallel with an inductor they increase the stability of a VFO
Which of these dialectrics is likely to be used in capacitors for VFO's?
1. Ceramic
2. Mica
3. Air
4. Water