SCI 206 || QUESTIONS WITH VERIFIED
CORRECTNESS!!
If you push against a heavy bookshelf but it remains in place, it experiences static friction with
the floor. If the bookshelf begins to slide as you push on it, it experiences sliding friction with the
floor. Friction extracts energy from the bookshelf
(A) only when it remains in place.
(B) only when you lift the bookshelf off the floor, not when you move it horizontally.
(C) both when it remains in place and when it's sliding across the floor.
(D) only when it's sliding across the floor. correct answers Answer: (D) only when it's sliding
across the floor.
You're heading northward in your car. The light turns red in front of you, so you step on the
brake. As you do,
(A) your car's velocity is southward.
(B) your car accelerates northward.
(C) your car accelerates southward.
(D) the net force on your car is zero. correct answers Answer: (C) your car accelerates
southward.
A typical lawnmower has an electromagnetic device called a magneto that produces a brief pulse
of high voltage electric charge. This charge runs through a short wire to the spark plug, where it
jumps across a gap to produce the spark that ignites the gasoline. Unfortunately, the lawnmower
interferes with the reception on your portable radio because
(A) the magnetic field from the magneto attracts charge out of your radio's antenna so that it
becomes electrically neutral.
(B) when the charge accelerates during each ignition pulse, it emits radio waves.
(C) the presence of electric charge in the magneto prevents current from flowing up and down
your portable radio's antenna.
(D) the alternating current used in the lawnmower's ignition system is incompatible with your
portable radio, which requires direct current for its operation. correct answers Answer: (B) when
the charge accelerates during each ignition pulse, it emits radio waves.
The main memory of your computer, also called dynamic memory, stores each individual bit as
the
(A) direction of current flow through a tiny electric circuit.
(B) amount of magnetism in a tiny iron bar.
(C) presence or absence of electric charge on a tiny capacitor.
(D) presence or absence of current in a tiny electric circuit. correct answers Answer: (C)
presence or absence of electric charge on a tiny capacitor.
, You have just pulled your clothes from the dryer and find that a sock is clinging to your jeans
with static electricity. You hold the jeans in one hand and the sock in the other and pull the two
apart. As jeans and sock move apart, the forces between them become weaker because the
(A) electric charge on each garment diminishes as they move apart.
(B) electric charge on each garment increases as they move apart.
(C) forces between electric charges become weaker with increasing distance.
(D) electric current passing through each garment diminishes as they move apart. correct answers
Answer: (C) forces between electric charges become weaker with increasing distance.
A "D" battery is labeled as providing 1.5 volts. This voltage characterizes the
(A) amount of current that the battery supplies when it's installed in an electronic device.
(B) amount of electric charge that can be created by the battery.
(C) energy that the battery provides to each coulomb of electric charge it handles.
(D) acceleration that positive charges experience as they leave its positive terminal. correct
answers Answer: (C) energy that the battery provides to each coulomb of electric charge it
handles.
Your friend has a gold ring that forms a continuous loop around her finger. If you hold the north
pole of a permanent magnet near that ring and then suddenly pull the magnet away, an electric
current will flow around the ring because the
(A) magnet's north pole attracts positive charge and pulls that charge around the ring.
(B) magnet's north pole repels positive charge and pushes that charge around the ring.
(C) decreasing magnetic field will produce an electric field in the ring and this electric field will
push charge around it.
(D) magnet's electric field decreases as you pull it away from the ring and this change will cause
current to flow around the ring. correct answers Answer: (C) decreasing magnetic field will
produce an electric field in the ring and this electric field will push charge around it.
When you bring the pole of a permanent magnet close to a piece of aluminum, the aluminum
repels it briefly. However, this repulsion disappears after a second or two because
(A) the electric current that makes the aluminum magnetic loses energy and comes to a stop.
(B) the magnetic domains in the aluminum flip so that they begin to attract the permanent
magnet.
(C) the magnetic domains in the aluminum return to pointing in random directions.
(D) the magnetization of the aluminum reverses directions 120 times per second, so that there is
no average attraction or repulsion. correct answers Answer: (A) the electric current that makes
the aluminum magnetic loses energy and comes to a stop.
A xerographic copier makes sure that the two sides of its photoconductor are oppositely charged
before it exposes that photoconductor to light from the original document. If the photoconductor
were not electrically charged before the exposure to light from the document,
CORRECTNESS!!
If you push against a heavy bookshelf but it remains in place, it experiences static friction with
the floor. If the bookshelf begins to slide as you push on it, it experiences sliding friction with the
floor. Friction extracts energy from the bookshelf
(A) only when it remains in place.
(B) only when you lift the bookshelf off the floor, not when you move it horizontally.
(C) both when it remains in place and when it's sliding across the floor.
(D) only when it's sliding across the floor. correct answers Answer: (D) only when it's sliding
across the floor.
You're heading northward in your car. The light turns red in front of you, so you step on the
brake. As you do,
(A) your car's velocity is southward.
(B) your car accelerates northward.
(C) your car accelerates southward.
(D) the net force on your car is zero. correct answers Answer: (C) your car accelerates
southward.
A typical lawnmower has an electromagnetic device called a magneto that produces a brief pulse
of high voltage electric charge. This charge runs through a short wire to the spark plug, where it
jumps across a gap to produce the spark that ignites the gasoline. Unfortunately, the lawnmower
interferes with the reception on your portable radio because
(A) the magnetic field from the magneto attracts charge out of your radio's antenna so that it
becomes electrically neutral.
(B) when the charge accelerates during each ignition pulse, it emits radio waves.
(C) the presence of electric charge in the magneto prevents current from flowing up and down
your portable radio's antenna.
(D) the alternating current used in the lawnmower's ignition system is incompatible with your
portable radio, which requires direct current for its operation. correct answers Answer: (B) when
the charge accelerates during each ignition pulse, it emits radio waves.
The main memory of your computer, also called dynamic memory, stores each individual bit as
the
(A) direction of current flow through a tiny electric circuit.
(B) amount of magnetism in a tiny iron bar.
(C) presence or absence of electric charge on a tiny capacitor.
(D) presence or absence of current in a tiny electric circuit. correct answers Answer: (C)
presence or absence of electric charge on a tiny capacitor.
, You have just pulled your clothes from the dryer and find that a sock is clinging to your jeans
with static electricity. You hold the jeans in one hand and the sock in the other and pull the two
apart. As jeans and sock move apart, the forces between them become weaker because the
(A) electric charge on each garment diminishes as they move apart.
(B) electric charge on each garment increases as they move apart.
(C) forces between electric charges become weaker with increasing distance.
(D) electric current passing through each garment diminishes as they move apart. correct answers
Answer: (C) forces between electric charges become weaker with increasing distance.
A "D" battery is labeled as providing 1.5 volts. This voltage characterizes the
(A) amount of current that the battery supplies when it's installed in an electronic device.
(B) amount of electric charge that can be created by the battery.
(C) energy that the battery provides to each coulomb of electric charge it handles.
(D) acceleration that positive charges experience as they leave its positive terminal. correct
answers Answer: (C) energy that the battery provides to each coulomb of electric charge it
handles.
Your friend has a gold ring that forms a continuous loop around her finger. If you hold the north
pole of a permanent magnet near that ring and then suddenly pull the magnet away, an electric
current will flow around the ring because the
(A) magnet's north pole attracts positive charge and pulls that charge around the ring.
(B) magnet's north pole repels positive charge and pushes that charge around the ring.
(C) decreasing magnetic field will produce an electric field in the ring and this electric field will
push charge around it.
(D) magnet's electric field decreases as you pull it away from the ring and this change will cause
current to flow around the ring. correct answers Answer: (C) decreasing magnetic field will
produce an electric field in the ring and this electric field will push charge around it.
When you bring the pole of a permanent magnet close to a piece of aluminum, the aluminum
repels it briefly. However, this repulsion disappears after a second or two because
(A) the electric current that makes the aluminum magnetic loses energy and comes to a stop.
(B) the magnetic domains in the aluminum flip so that they begin to attract the permanent
magnet.
(C) the magnetic domains in the aluminum return to pointing in random directions.
(D) the magnetization of the aluminum reverses directions 120 times per second, so that there is
no average attraction or repulsion. correct answers Answer: (A) the electric current that makes
the aluminum magnetic loses energy and comes to a stop.
A xerographic copier makes sure that the two sides of its photoconductor are oppositely charged
before it exposes that photoconductor to light from the original document. If the photoconductor
were not electrically charged before the exposure to light from the document,
