Physics Chapter 24
Physics Chapter 24
- 1.
The source of all magnetism is
- A.
Tiny pieces of iron
- B.
Tiny domains of aligned atoms
- C.
Ferromagnetic materials
- D.
Moving electric charge
- E.
None of these
Correct Answer
D. Moving electric charge -
- 2.
Magnetic compasses apparently were first used by
- A.
Columbus
- B.
Greeks
- C.
Australian aborigines
- D.
Vikings
- E.
Pigeons, then Chinese
Correct Answer
E. Pigeons, then Chinese -
- 3.
Moving electric charges will interact with
- A.
An electric field
- B.
A magnetic field
- C.
Both of these
- D.
None of these
Correct Answer
C. Both of these -
- 4.
If a steady magnetic field exerts a force on a moving charge, that force is directed
- A.
Opposite the direction of the motion
- B.
In the direction of the motion
- C.
At right angles to the direction of the motion
Correct Answer
C. At right angles to the direction of the motion -
- 5.
If a steady magnetic field exerts a force on a moving charge, that force is directed
- A.
In the direction of the field
- B.
Opposite the direction of the field
- C.
At right angles to the direction of the field
Correct Answer
C. At right angles to the direction of the field -
- 6.
An iron rod becomes magnetic when
- A.
Positive ions accumulate at one end and negative ions at the other end
- B.
It atoms are aligned having plus charges on one side and negative charges on the other
- C.
The net spins of its electrons are in the same direction
- D.
Its electrons stop moving and point in the same direction
- E.
None of these
Correct Answer
C. The net spins of its electrons are in the same direction -
- 7.
Like kinds of magnetic poles repel while unlike kinds of magnetic poles
- A.
Attract
- B.
Repel also
- C.
May attract or repel
Correct Answer
A. Attract -
- 8.
Several paper clips dangle from the north pole of a magnet. the induced pole in the bottom of the lowermost paper clip is a
- A.
North pole
- B.
South pole
- C.
North or south pole-no difference really
Correct Answer
A. North pole -
- 9.
An iron nail is more strongly attracted to the
- A.
North pole of a magnet
- B.
South pole of a magnet
- C.
North or south pole- no difference really
Correct Answer
C. North or south pole- no difference really -
- 10.
Surrounding every moving electron is
- A.
A magnetic field
- B.
An electric field
- C.
Both of these
- D.
None of these
Correct Answer
C. Both of these -
- 11.
Magnetism is due to the motion of electrons as they
- A.
Move around the nucleus
- B.
Spin on their axes
- C.
Both of these
- D.
None of these
Correct Answer
C. Both of these -
- 12.
Magnetic domains normally occur in
- A.
Iron
- B.
Copper
- C.
Silver
- D.
All of these
- E.
None of these
Correct Answer
A. Iron -
- 13.
Magnetic field lines about a current-carrying wire
- A.
Extend radially from the wire
- B.
Circle the wire in closed loops
- C.
Both of these
- D.
Neither of these
Correct Answer
B. Circle the wire in closed loops -
- 14.
The force on an electron moving in a magnetic field will be the largest when its direction is
- A.
The same as the magnetic field direction
- B.
Exactly opposite tot he magnetic field direction
- C.
Perpendicular to the magnetic field direction
- D.
At an angle other than 90 degrees tot eh magnetic field direction
- E.
None of these
Correct Answer
C. Perpendicular to the magnetic field direction -
- 15.
The intensity of cosmic rays bombarding the Earth's surface is largest at the
- A.
Poles
- B.
Mid-latitudes
- C.
Equator
Correct Answer
A. Poles -
- 16.
If we think of the Earth as a magnet, its north (SEEKING) pole is nearest
- A.
The Hudson Bay region of Canada
- B.
Australia
- C.
Both of these
Correct Answer
B. Australia -
- 17.
Which pole of a compass needle points to a south pole of a magnet?
- A.
North pole
- B.
South pole
- C.
Both of these
Correct Answer
A. North pole -
- 18.
Pigeons navigate primarily by
- A.
A good memory
- B.
A keen sense of smell
- C.
Magnetic sensors in their heads
- D.
Ultra-high pitched sounds
- E.
None of these
Correct Answer
C. Magnetic sensors in their heads -
- 19.
Magnet A has twice the magnetic field strength of Magnet B and at a certain distance pulls on magnet B with a force of 100 N. the amount of force that magnet A exerts on magnet B is
- A.
At or about 50 N
- B.
Exactly 100 N
- C.
More information is needed
Correct Answer
B. Exactly 100 N -
- 20.
Compared to the huge force that attracts an iron tack to a strong magnet, the force that the tack exerts on the magnet is
- A.
Relatively small
- B.
Equally huge
- C.
More information is needed
Correct Answer
B. Equally huge -
- 21.
An electron is hot from the right, toward a spot just between the ends of the magnet. the electron
- A.
Is unaffected by the field
- B.
Is attracted to one of the poles,and repelled from the other
- C.
Is repelled by both poles, and therefore is turned back
- D.
Is deflected into the plane of the page
- E.
Accelerates straight toward the spot
Correct Answer
D. Is deflected into the plane of the page -
- 22.
If a compass is moved form northern hemisphere to the southern hemisphere, its magnetic needle will change direction
- A.
By 180 degrees
- B.
Depending on where the measurement is taken
- C.
By 90 degrees
- D.
Hardly at all
- E.
None of these
Correct Answer
D. Hardly at all -
- 23.
A possible cause for the existence of the Earth's magnetic field is
- A.
Moving charges in the liquid part of the Earth's core
- B.
Great numbers of very slow moving charges in the Earth
- C.
Convection currents in the liquid part of the Earth's core
- D.
All of these
- E.
None of these
Correct Answer
D. All of these -
- 24.
Outside a magnet, magnetic field lines are conventionally drawn from
- A.
North to south
- B.
South to north
- C.
Either way
Correct Answer
A. North to south -
- 25.
Which force field can increase a moving electron's speed?
- A.
Electric field
- B.
Magnetic filed
- C.
Bother of these
- D.
None of these
Correct Answer
A. Electric field -
- 26.
Which force field can accelerate an electron, but never change its speed?
- A.
Electric field
- B.
Magnetic field
- C.
Both of these
- D.
None of these
Correct Answer
B. Magnetic field -
- 27.
When a bar magnet is broken in two as shown, each piece is
- A.
As magnetic as the original magnet
- B.
Actually stronger than the original magnet
- C.
At most half as strong as the original magnet
- D.
No longer magnetic
Correct Answer
C. At most half as strong as the original magnet -
- 28.
Superconducting electromagnets
- A.
Exist now
- B.
May be possible in the near future
- C.
May be possible in the distant future
- D.
Are science fiction
Correct Answer
A. Exist now -
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