PHYS Missed Final Questions
Charge flows in a closed circuit
True
In a simple circuit containing a bulb, energy is given to the moving charges by
a generator
A whitish sky is evidence that the atmosphere contains
a mixture of particles
A good heat conductor is
a poor insulator
Which of the following can be projected onto a viewing screen?
a real image
The unit of electric charge, the coulomb, is the charge on
a specific large number of electrons
Objects that radiate relatively well
absorb radiation relatively well
When a solid is changed to a liquid state, the solid
absorbs energy
You can briefly touch a hot clothes iron with a bare wet finger because the wetness
absorbs energy in vaporizing and provides an insulating layer after it changes state
The principal advantage of ac power over dc power is that
ac voltage can be transformed via conventional transformers
When there is a change in the magnetic field in a closed loop of wire
all of these: a voltage is induced in the wire a current is created in the loop of wire electromagnetic induction occurs
Moving electric charges will interact with
an electric field and a magnetic field
Glass is transparent to wave frequencies that
are below its natural frequencies
If a steady magnetic field exerts a force on a moving charge, that force is directed
at right angles to the direction of the motion
The vibrations of a transverse wave move in a direction
at right angles to the direction of wave travel
The source of electrons lighting an incandescent ac light bulb is
atoms in the light bulb filament
An electron and a proton
attract each other
If you want to cook eggs by boiling them while in the mountains, then compared to sea-level cooking, you should
boil the eggs for a longer time
If a light signal and a radio signal were emitted simultaneously from Alpha Centauri, the first to reach Earth would be the
both at the same time
If glass expanded more than mercury, then the column of mercury in a mercury thermometer would rise when the temperature
decreases
When a volume of air is compressed, its temperature
decreases
The fundamental force underlying all chemical reactions is
electrical
When we say an appliance "uses up electricity," we really are saying that
electron kinetic energy is changed into heat and other forms of energy
The output power of an ideal transformer is
equal to the input power
An electroscope is charged positively as shown by foil leaves that stand apart. As a negative charge is brought close to the electroscope, the leaves
fall closer together
The part of the electromagnetic spectrum most absorbed by water is
infrared
Magnetic domains normally occur in
iron
If the waves are going by at the same frequency, the wave that has the greatest speed will have the greatest
length
The incident light ray, the reflected light ray, and the normal between them
lie in the same plane
Power is transmitted at high voltages because the corresponding current in the wires is
low
Glass is opaque to wave frequencies that
match its natural frequencies
A wire that carries an electric current
may be electrically charged
When two lamps are connected in series to a battery, the electrical resistance that the battery senses is
more than the resistance of either lamp
The electric field inside the dome of a Van de Graaff generator depends on
neither it's size or amount of charge on it
Double the frequency of sound and you also double its
none of these: wavelength speed amplitude
A wave travels an average distance of 1 meter in 1 second with a frequency of 1 hertz. Its amplitude is
not enough information
To say that one wave is out of phase with another is to say that the waves are
out of step
Modern automobile headlights are connected in
parallel
The headlights, radio, and defroster fan in an automobile are connected in
parallel with a switch for each
The whiteness of clouds is evidence in the clouds for a variety of
particle sizes
A sound source of high frequency emits a high
pitch
A negatively charged rod is held near a metal can that rests on a dry wood table. If you touch the opposite side of the can momentarily with your finger the can is then
positively charged
A Thermos bottle has double glass walls with silver coating on the glass surfaces that face one another. The silver coating reduces the energy that is transferred by
radiation
Reverberation is actually a case of
re-echoed sound
When a bar magnet is thrust into a coil of copper wire, the coil tends to
repel the magnet as it enters
When you tune a radio to a certain station, you match the frequency of the internal electrical circuit to the frequency of the wanted radio station. In so doing you are employing the principle of
resonance
When ultraviolet light is incident upon glass, atoms in the glass
resonate
In an electric circuit, the safety fuse is connected to the circuit in
series
The higher the temperature of an object,
shorter the wavelengths it radiates.
The pendulum with the greatest frequency is the pendulum with the
shortest period and shortest length
Morning dew on the grass is a result of
slow-moving molecules condensing on the grass
Which of the following is fundamentally different from the others?
sound waves
If the voltage produced by a generator alternates, it does so because
the changing magnetic field that produces it alternates
Two lamps, one with a thick filament and one with a thin filament, are connected in series. The current is greater in the lamp with the
thick filament
For light, a red shift indicates that the light source is moving
toward you
Sound waves can interfere with one another so that no sound results
true
If a magnet is pushed into a coil, voltage is induced across the coil. If the same magnet is pushed into a coil with twice the number of loops,
twice as much voltage is induced
The food in a refrigerator is cooled by
vaporization of the refrigerating fluid.
The cooling effect inside a refrigerator is produced by
vaporizing the refrigeration liquid
A 4-ohm resistor is connected in parallel with a 6-ohm resistor. This combination produces an equivalent resistance of
2.4 ohms
The approximate range of human hearing is
20 hertz to 20,000 hertz
Two identical blocks of iron, one at 10 degrees C and the other at 20 degrees C, are put in contact. Suppose the cooler block cools to 5 degrees C and the warmer block warms to 25 degrees C. This would violate the
2nd law of thermodynamics
The temperature at the bottom of Lake Tahoe, high in the Sierra Nevada Mountains in California, at this moment is
4 degrees Celsius
To increase the temperature of 50 grams of water by 2 Celsius degrees requires
4.18 calories
A certain transformer doubles input voltage. If the primary coil has 10 A of current, then the current in the secondary coil is
5 A
A coulomb of charge that passes through a 6-volt battery is given
6 Joules
Assume that 10 J of work is needed to push a charge, at rest, into an electric field. After the charge is released there, it flies back to its starting position and its kinetic energy there will be
10 J
A diver shines light up to the surface of a smooth pond at a 10 degree angle to the normal. Some light passes into the air above, and the part that reflects back into the water makes an angle to the normal of
10 degrees
Which could burn a boy scout the most?
100 g of steam at 100 degrees C
When a pair of 1-ohm resistors are connected in series, their combined resistance is
2 ohms, and when in parallel, 1/2 ohms
The operation of a geyser such as, Old Faithful in Yellowstone, is most like
Coffee Percolator
To turn ice at zero degrees Celsius to water at zero degrees Celsius, we must add
Energy
Two charged particles attract each other with a force F. If the charges of both particles are doubled, and the distance between them also doubled, then the force of attraction will be
F
Food in a pressure cooker is cooked faster because of the
Higher temperature
If waves are going by at the same speed, the wave with the greatest period of oscillation is the wave that has the greatest
None of the above: amplitude length frequency
A dolphin perceives its environment by the sense of
both sight and sound
Which body glows with electromagnetic waves?
both the Sun and the Earth
Light refracts when traveling from air into glass because light
changes speed
Magnetic field lines about a current-carrying wire
circle the wire in closed loops
If air were a better conductor than it is, at nighttime the Earth would be
considerably colder
Blow on your hand with your open mouth and you feel the warmth of your breath. Pucker your lips so your breath expands as you blow and your breath is
cooler
Melting snow
cools the surrounding air
A sheet of red paper will look black when illuminated with
cyan light
Consider a sample of ice at 0 degrees C. If the temperature is decreased, the volume of the ice
decreases
A device that transforms mechanical energy into electrical energy is a
generator
Alternating current is normally produced by a
generator
The reason the sun's radiant energy is of shorter wavelengths than the Earth's is because the sun
has a higher temperature than Earth
The moderate temperatures of islands throughout the world has much to do with water's
high specific heat
Compared to a giant iceberg, a hot cup of coffee has
higher temperature, but less internal energy
An object will normally be a net radiator of energy when its temperature is
higher than it's surroundings
The function of polarizing filters in viewing 3-D slides or movies is to provide each eye
in independent left or right-eye view
Compressions and rarefactions normally travel in
in the same direction as the wave
Your refrigerator is in your kitchen. If you try to cool your kitchen on a hot day by operating your refrigerator with its door open, the kitchen temperature will
increase
Heat a copper wire and its electric resistance
increases
A step-up transformer increases
voltage
When water vapor condenses on the inside of a window, the room becomes slightly
warmer
If a volume of air is warmed, it expands. If a volume of air expands, it
warms
A woman experiences an electrical shock. The electrons making the shock come from the
woman's body
The number of electrons delivered daily to an average American home by an average power utility in the mid 1980s was
zero