Chapter 7 Multiple Choice Quiz 2

Please answer all questions


1	How does an electron acquire a negative charge?
		A)	from an imbalance of subatomic particles
		B)	by induction or contact with charged objects
		C)	from the friction of certain objects rubbing together
		D)	Charge is a fundamental property of an electron.


2	An object that acquires an excess of electrons becomes a (an)
		A)	ion.
		B)	negatively charged object.
		C)	positively charged object.
		D)	electrical conductor.


3	Which of the following is most likely to acquire an electrostatic charge?
		A)	electrical conductor
		B)	electrical nonconductor
		C)	Both are equally likely.
		D)	None of the above is correct.


4	A quantity of electric charge is measured in a unit called a (an)
		A)	coulomb.
		B)	volt.
		C)	amp.
		D)	watt.


5	The unit that describes the potential difference that occurs when a certain amount of work is used to move a certain quantity of charge is called the
		A)	ohm.
		B)	volt.
		C)	amp.
		D)	watt.


6	Which of the following units are measures of rates?
		A)	amp and volt
		B)	coulomb and joule
		C)	volt and watt
		D)	amp and watt


7	An electric current is measured in units of
		A)	coulomb.
		B)	volt.
		C)	amp.
		D)	watt.


8	If you consider a current to be positive charges that flow from the positive to the negative terminal of a battery, you are using which description of a current?
		A)	electron current
		B)	conventional current
		C)	proton current
		D)	alternating current


9	In an electric current the electrons are moving
		A)	at a very slow rate.
		B)	at the speed of light.
		C)	faster than the speed of light.
		D)	at a speed described as "Warp 8."


10	In which of the following currents is there no electron movement from one end of a conducting wire to the other end?
		A)	electron current
		B)	direct current
		C)	alternating current
		D)	None of the above is correct.


11	If you multiply amps x volts, the answer will be in units of
		A)	resistance.
		B)	work.
		C)	current.
		D)	power.


12	The unit of resistance is the
		A)	watt.
		B)	ohm.
		C)	amp.
		D)	volt.


13	Which of the following is a measure of electrical work?
		A)	kilowatt
		B)	C
		C)	kWhr
		D)	C/s


14	Compared to a thick wire, a thin wire of the same length, material, and temperature has
		A)	less electrical resistance.
		B)	more electrical resistance.
		C)	the same electrical resistance.
		D)	None of the above is correct.


15	If an electric charge is somehow suddenly neutralized, the electric field that surrounds it will
		A)	immediately cease to exist.
		B)	collapse inward at some speed.
		C)	continue to exist until neutralized.
		D)	move off into space until it finds another charge.


16	The earth's north magnetic pole
		A)	is located at the geographic North Pole.
		B)	is a magnetic south pole.
		C)	has always had the same orientation.
		D)	None of the above is correct.


17	A permanent magnet has magnetic properties because
		A)	the magnetic fields of its electrons are balanced.
		B)	of an accumulation of monopoles in the ends.
		C)	the magnetic domains are aligned.
		D)	All of the above are correct.


18	A current-carrying wire has a magnetic field around it because
		A)	a moving charge produces a magnetic field of its own.
		B)	the current aligns the magnetic domains in the metal of the wire.
		C)	the metal was magnetic before the current was established and the current enhanced the magnetic effect.
		D)	None of the above is correct.


19	If you reverse the direction that a current is running in a wire, the magnetic field around the wire
		A)	is oriented as it was before.
		B)	is oriented with an opposite north direction.
		C)	flips to become aligned parallel to the length of the wire.
		D)	ceases to exist.


20	A step-up transformer steps up (the)
		A)	power.
		B)	current.
		C)	voltage.
		D)	All of the above are correct.

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