Superconductivity is lost when a certain ____is exceeded.
a. voltage b. current
c. resistance d. electric field
e. critical temperature
[Ques. 2] What is meant by net charge?'
a. the total amount of positive charge on an object
b. the total amount of negative charge on an object
c. the total amount of neutral charge on an object
d. A minus B
[Ques. 3] What is meant by like charges?'
a. charges that are both positive
b. equal amounts of charge
c. charges that are both negative
d. A and C
[Ques. 4] The SI unit of electric charge is
a. e, the charge on the electron.
b. the coulomb.
c. the ampere.
d. the ohm.
e. the volt.
[Ques. 5] Suppose current is flowing in a wire from right to left. Which way do the electrons in the wire move?
a. right to left
b. left to right
c. in circles
d. It is impossible to tell.
[Ques. 6] The rate of flow of electric charge is
a. voltage.
b. current.
c. resistance.
d. electric field.
e. critical temperature.
[Ques. 7] An object that has zero resistance is a
a. semiconductor.
b. superconductor.
c. diode.
d. transistor.
e. positive ion.
[Ques. 8] An electric current can consist of
a. positive ions flowing in a liquid. b. negative ions flowing in a liquid.
c. electrons flowing in a wire. d. all of the above.
[Ques. 9] An atom with fewer electrons than protons is
a. a semiconductor.
b. a superconductor.
c. a positive ion.
d. a negative ion.
e. none of the above.
[Ques. 10] A positive ion is formed when
a. a neutral atom gains an electron. b. a neutral atom loses an electron.
c. a negative ion loses an electron. d. all of the above
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