7. a series circuit contains a generator, two devices, and connecting wires. the resistances of the two devices are 15 ohms and 10 ohms. the voltage supplied by the generator is 75 v. what will be the voltage drop in the device with 10 ohms of resistance?
a. 45 v
b. 25 v
c. 30 v
d. 3 v

8. which of the following is true about semi-conductors:

a. gold and silver are important semiconductors
b. neither free electrons nor holes are considered charge carriers in a semi-conductor
c. a material is classified as a semiconductor if its resistance to the flow of electric current is too low to permit it to be called a conductor
d. exposing a crystal of a semiconductor to heat or light starts displacing valence electrons which then move throughout the crystal

15. imagine that an uncharged pith ball is brought into the electrostatic field of a charged rod. the side of the pith ball closest to the negatively charged end of the rod will

a. be given a negative charge produced by the movement of electrons from the other end of the ball.
b. not experience any induced charge and remain neutral.
c. be given a negative charge produced by the movement of electrons from the rod.
d. be given a positive charge produced by the movement of electrons to the other end of the ball.

16. which of the following is true in regard to a charged atom?

a. the magnitude of the negative charge is equal to the magnitude of the positive charge.
b. the number of protons and the number of electrons within the same atom are unequal.
c. when an atom gains an electron, it becomes a cation, which is positively charged.
d. when an atom loses an electron, it becomes an anion, which is negatively charged.

17. within an integrated circuit, each wafer is cut into sections, which

a. carry a single circuit and are placed in individual cases.
b. carry a single circuit and are placed all together in one case.
c. have multiple circuits and are placed all together in one case.
d. have multiple circuits and are placed in individual cases.