9-11 R.A.T.S. Flashcards
A magnetic force acts most strongly on a current-carrying wire when the wire
A. carries a very large current.
B. is perpendicular to the magnetic field.
C. either or both of these
D. none of the above
C.
The slowing of light in transparent materials has to do with
A. the time for absorption and re-emission of light.
B. the density of materials.
C. different frequency ranges in materials.
D. the fundamental difference between light and sound.
A.
A sonic boom cannot be produced by
A. an aircraft flying slower than the speed of sound.
B. a whip.
C. a speeding bullet.
D. all of these
A.
The source of electromagnetic waves is vibrating
A. electrons.
B. atoms.
C. molecules.
D. energy fields.
A.
The source of all magnetism is
A. tiny bits of iron.
B. tiny domains of aligned atoms.
C. small lodestones.
D. the motion of electrons.
D.
The underlying physics of an electric motor is that
A. electric and magnetic fields repel each other.
B. a current-carrying wire experiences force in a magnetic field.
C. like magnetic poles both attract and repel each other.
D. ac voltage is induced by a changing magnetic field.
B.
Electricity and magnetism connect to form
A. mass.
B. energy.
C. ultra high-frequency sound.
D. light.
D.
The essential physics concept in an electric generator is
A. Coulomb’s law.
B. Ohm’s law.
C. Faraday’s law.
D. Newton’s second law.
C.
When you thrust a bar magnet to and fro into a coil of wire, you induce
A. direct current.
B. alternating current.
C. neither dc nor ac.
D. alternating voltage only, not current.
B.
Sound waves cannot be
A. reflected.
B. absorbed.
C. diminished by interference.
D. none of these
D.
A transformer works by way of
A. Coulomb’s Law
B. Ohm’s law.
C. Faraday’s law.
D. Newton’s second law.
C.
The colors on the cover of your physical science book are due to
A. color addition.
B. color subtraction.
C. color interference.
D. scattering.
B.
The vibrations set up in a radio loudspeaker have the same frequencies as the vibrations
A. in the electric signal fed to the loudspeaker.
B. that produce the sound you hear.
C. both of these
D. none of these
C.
When a 134-Hz tuning fork and a 144-Hz tuning fork are struck, the beat frequency is
A. 2 Hz.
B. 6 Hz.
C. 8 Hz.
D. more than 8 Hz.
D.
When a light ray passes at an angle from water into the air, the ray in the air bends
A. toward the normal.
B. away from the normal.
C. either away from or toward the normal.
D. parallel to the normal.
B.
