Choose the best answer.

1		Electric charge __________________.
			A)	can be subdivided indefinitely
			B)	occurs only in separate parcels of ±1.6 × 10-19 C
			C)	occurs only in separate parcels of ±1 C
			D)	occurs only in separate parcels whose value depends on the particle carrying the charge
2		Which of the following statements is not true?
			A)	The positive charge in an atomic nucleus is due to the protons it contains
			B)	All protons have the same charge
			C)	Protons and electrons have charges equal in magnitude although opposite in sign
			D)	Protons and electrons have equal masses
3		The electric force between a proton and an electron __________________.
			A)	is weaker than the gravitational force between them
			B)	is equal in strength to the gravitational force between them
			C)	is stronger than the gravitational force between them
			D)	is any of the above, depending on the distance between the proton and the electron
4		The electrons in an atom __________________.
			A)	are bound to it permanently
			B)	are some distance away from the nucleus
			C)	have more mass than the nucleus
			D)	may be positively or negatively charged
5		Atoms and molecules are normally ________________.
			A)	electrically neutral
			B)	negatively charged
			C)	positively charged
			D)	ionized
6		If you divide voltage by resistance, the answer will be in units of ____________________.
			A)	coulombs
			B)	ohms
			C)	amperes
			D)	watts
7		Electric power is equal to _________________.
			A)	(current)(voltage)
			B)	current/voltage
			C)	voltage/current
			D)	(resistance)(voltage)
8		All magnetic fields originate in ___________________.
			A)	iron atoms
			B)	permanent magnets
			C)	stationary electric charges
			D)	moving electric charges
9		The force on an electron that moves in a curved path must be ___________________.
			A)	gravitational
			B)	electrical
			C)	magnetic
			D)	one or more of the above
10		Magnetic field line provide a convenient way to visualize a magnetic field. Which of the following statements is not true?
			A)	the path followed by an iron particle released near a magnet corresponds to an field line
			B)	the path followed by an electric charge released near a magnet corresponds to a field line
			C)	a compass needle in a magnetic field turns until it is parallel to the field lines around it
			D)	magnetic field lines do not actually exist
11		A moving electric charge produces __________________.
			A)	only an electric field
			B)	only a magnetic filed
			C)	both an electric and a magnetic field
			D)	any of the above, depending on its speed
12		A magnet does not exert a force on __________________.
			A)	an unmagnetized iron bar
			B)	a magnetized iron bar
			C)	a stationary electric charge
			D)	a moving electric charge
13		A current-carrying wire is in a magnetic field with the direction of the current the same as that of the field _________________.
			A)	the wire tends to move parallel to the field
			B)	The wire tends to move perpendicular to the field
			C)	the wire tends to turn until it is perpendicular to the field
			D)	the wire has no tendency to move or to turn
14		The nature of the force that is responsible for the operation of an electric motor is _________________.
			A)	electric
			B)	magnetic
			C)	a combination of electric and magnetic
			D)	either electric or magnetic, depending on the design of the motor
15		The alternating current in the secondary coil of a transformer is induced by __________________.
			A)	the varying electric field of the primary coil
			B)	the varying magnetic field of the primary coil
			C)	the varying magnetic field of the secondary coil
			D)	the iron core of the transformer
16		A transformer can change __________________.
			A)	the voltage of an alternating current
			B)	the power of an alternating current
			C)	alternating current to direct current
			D)	direct current to alternating current
17		A positive and a negative charge are initially 4 cm apart. When they are moved closer together so that they are now only 1 cm apart, the force between them is ___________________.
			A)	4 times smaller than before
			B)	4 times larger than before
			C)	8 times larger than before
			D)	16 time large than before
18		The current in a 12-W toaster operated at 120 V is _________________.
			A)	0.1 A
			B)	10 A
			C)	12 A
			D)	1440 A
19		The current in a 40-W 12-V electric light bulb is _________________.
			A)	1/3 A
			B)	3 A
			C)	80 A
			D)	4800 A
20		A transformer whose primary winding has twice as many turns as its secondary winding is used to convert 240-V ac to 120-V ac. If the current in the secondary circuit is 4 A, the primary current is _________________.
			A)	1 A
			B)	2 A
			C)	4 A
			D)	8 A