Electric Field & Combination of Diverging and Converging Lenses Questions The reason we can read print from any direction is that the white part of a page

Electric Field & Combination of Diverging and Converging Lenses Questions The reason we can read print from any direction is that

the white part of a page reflects light in all directions.
letters emit black light in all directions.
letters absorb black light from all directions.

A resistor is something placed in a circuit that totally blocks the flow of electrons.

True
False

A 10 micro-Coulomb charge is located in a 400 N/C electric field. What is the force experienced by the charge?

a. b. c.

1 x 10-3. N
4 x 10-3. N
4 x 10-3. N/C

The electrical force on a 2 C charge is 20 N. What is the value of the electric field at the location of the charge?

2N/C
10 N/C
20 N/C

Electrons move in an electric circuit

by being physically bumped by other electrons.
by interacting with an established electric field.
because the wires are so thin.

When light strikes the surface of a material like glass or water it is usually

completely reflected back from the surface of the material.
completely transmitted through the material.
partially transmitted and partially reflected.

Laser light is emitted when excited atoms of a solid, liquid, or gas are stimulated to emit photons in phase.

true
false

____ 8.

____ 9.

____ 10.

____ 11.

____ 12.

____ 13.

____ 14.

____ 15.

____ 16.

An electroscope is charged positively, as shown by foil leaves that stand apart. As a negatively charged rod is brought close to the electroscope, the leaves

spread farther apart.
do not move.
move closer together.

If you stand 1 m in front of a plane mirror your image appears

less than 1 m behind the mirror.
1 m behind the mirror.
more than 1 m behind the mirror.

Why does a farsighted person have trouble focusing on nearby objects?

images form in front of retina (eyeball is too long)
iris opening is too small
image forms behind retina (eyeball is too short)

Two charges separated a distance of 1.0 meter exert a 2.0-N force on each other. If the charges are pushed to a separation of meter, the force on each charge will be

0.67 N.
6.0 N.
18.0 N.

Two charges separated by a distance of 1 meter exert a 20-N force on each other. If the charges are pulled to a 2 meter separation distance, the force on each charge will be

a. 5N. b. 10N. c. 40N.

Compared to gravity, the electromagnetic force is

about the same strength.
much stronger.
much weaker.

What is the resistance of a toaster that uses 5 A of current when connected to a 120 volt power source? (Apply Ohm’s Law.)

5 ohms
24 ohms
600 ohms

A magnifying glass is a

diverging lens.
combination of diverging and converging lenses.
converging lens.

When a wave slows down it

bends away from the normal.
bends toward the normal.
continues in a straight line. Course Name: Physics 2
Student: Kwinda Netshitangani
Course ID: SCIH036058
ID: J47865775
Submittal: 52
Progress Test 2
This Progress Test covers the course materials that were assigned in Units 3 and 4. Although the progress test is
similar in style to the unit evaluations, the progress test is a closed-book, proctored test. You may not have access
to notes or any of the course materials while you are taking the test. It is important that you do your own work.
Select the response that best completes the statement or answers the question.
You may use your calculator or scratch paper to work out solutions.
____ 1.
The reason we can read print from any direction is that
a.
b.
c.
____ 2.
A resistor is something placed in a circuit that totally blocks the flow of electrons.
a.
b.
____ 3.
____ 4.
a.
1 x 10-3. N
b.
4 x 10-3. N
c.
4 x 10-3. N/C
The electrical force on a 2 C charge is 20 N. What is the value of the electric field at the location of the
charge?
by being physically bumped by other electrons.
by interacting with an established electric field.
because the wires are so thin.
When light strikes the surface of a material like glass or water it is usually
a.
b.
c.
____ 7.
2 N/C
10 N/C
20 N/C
Electrons move in an electric circuit
a.
b.
c.
____ 6.
True
False
A 10 micro-Coulomb charge is located in a 400 N/C electric field. What is the force experienced by the
charge?
a.
b.
c.
____ 5.
the white part of a page reflects light in all directions.
letters emit black light in all directions.
letters absorb black light from all directions.
completely reflected back from the surface of the material.
completely transmitted through the material.
partially transmitted and partially reflected.
Laser light is emitted when excited atoms of a solid, liquid, or gas are stimulated to emit photons in phase.
a.
b.
true
false
____ 8.
An electroscope is charged positively, as shown by foil leaves that stand apart. As a negatively charged rod
is brought close to the electroscope, the leaves
a.
b.
c.
____ 9.
spread farther apart.
do not move.
move closer together.
If you stand 1 m in front of a plane mirror your image appears
a.
b.
c.
less than 1 m behind the mirror.
1 m behind the mirror.
more than 1 m behind the mirror.
____ 10. Why does a farsighted person have trouble focusing on nearby objects?
a.
b.
c.
images form in front of retina (eyeball is too long)
iris opening is too small
image forms behind retina (eyeball is too short)
____ 11. Two charges separated a distance of 1.0 meter exert a 2.0-N force on each other. If the charges are pushed
to a separation of meter, the force on each charge will be
a.
b.
c.
0.67 N.
6.0 N.
18.0 N.
____ 12. Two charges separated by a distance of 1 meter exert a 20-N force on each other. If the charges are pulled
to a 2 meter separation distance, the force on each charge will be
a.
b.
c.
5 N.
10 N.
40 N.
____ 13. Compared to gravity, the electromagnetic force is
a.
b.
c.
about the same strength.
much stronger.
much weaker.
____ 14. What is the resistance of a toaster that uses 5 A of current when connected to a 120 volt power source?
(Apply Ohm’s Law.)
a.
b.
c.
5 ohms
24 ohms
600 ohms
____ 15. A magnifying glass is a
a.
b.
c.
diverging lens.
combination of diverging and converging lenses.
converging lens.
____ 16. When a wave slows down it
a.
b.
c.
bends away from the normal.
bends toward the normal.
continues in a straight line.
____ 17. When dolphins want to detect smaller details they emit sound waves that
a.
b.
c.
have a longer wavelength.
have a shorter wavelength.
travel faster.
____ 18. If the wavelengths are large compared to the size of the obstruction
a.
b.
c.
there is no diffraction.
there is a little diffraction.
there is a lot of diffraction.
____ 19. The type of image formed in a converging lens
a.
b.
c.
depends on the size of the object.
depends on the position of the object.
is always virtual.
____ 20. When an electron is brought near a negatively charged sphere the electrical potential energy increases
because work was done to bring the charges together.
a.
b.
True.
False.
____ 21. What factors affect the type of image formed?
a.
b.
c.
the size of the object and how the object is illuminated
the shape of the lens and the distance between the lens and the object
the shape of the lens and the size of the object
____ 22. The angle of incidence is
a.
b.
c.
the angle between the normal and the incident light ray.
greater than the angle of reflection.
the angle between the surface and the incident light ray.
____ 23. When one light bulb in a series circuit containing several light bulbs burns out
a.
b.
c.
none of the other bulbs will light up.
nothing changes in the rest of the circuit.
the other light bulbs burn bright.
____ 24. How will placing electronic components inside a metal box protect them from outside electrical activity?
a.
b.
c.
Electrons on the surface of the metal will arrange themselves in such a way to cancel outside electric
fields.
Electrons on the surface of the metal cannot move so they protect the interior from outside electric
fields.
Electrons on the surface will be removed by the outside electric field so the outside electric fields are
cancelled.
____ 25. Alternating current is made by
a.
b.
c.
alternating current and voltage.
alternating the direction of voltage of the power source.
huge chemical batters.
____ 26. The electric field around an isolated electron has a certain strength 1 cm from the electron. The electric field
strength 2 cm from the electron is
a.
b.
c.
half as much.
twice as much.
one-fourth as much.
____ 27. Protons and electrons
a.
b.
c.
attract each other.
repel each other.
do not interact.
____ 28. Suppose a hollow metal sphere has a large number of extra electrons on it. The extra electrons will be
located
a.
b.
c.
only on the outside surface of the sphere.
only on the inside surface of the sphere.
both on the inside and outside surfaces of the sphere.
____ 29. Refraction can be caused by a change in the temperature of the medium.
a.
b.
true
false
____ 30. Magnification can be accomplished with a hologram if it is viewed with light that has a
a.
b.
c.
shorter wavelength than original light.
longer wavelength than the original light.
neither of the above.
____ 31. A converging lens causes rays of light that are initially parallel to meet at a single point called the
a.
b.
c.
focal point.
focal length.
focal plane.
____ 32. Huygen’s principle states that
a.
b.
c.
when light passes through two narrow slits, it produces an interference pattern.
each point on a wave front acts as a new source of wavelets.
light waves bend slightly when passing through an opening.
____ 33. What is the resistance in a circuit if 120 V and 3 A are present? (Apply Ohm’s Law.)
a.
b.
c.
360 ohms
0.025 ohms
40 ohms
____ 34. What is a circuit?
a.
b.
c.
a way to light a light-bulb with a battery
a diagram showing how wires, batteries and bulbs are connected
a complete path for electrons to flow from battery to bulb and back
____ 35. A thin film appears blue when illuminated with white light. The color being canceled by destructive
interference is
a.
b.
c.
yellow.
red.
green.
____ 36. When plugged into a 120 V wall outlet, how much current is used by a 100 W light bulb? (I=P/V)
a.
b.
c.
0.83 A
12000 A
1.2 A
____ 37. The energy stored in a capacitor comes from the work required to discharge it.
a.
b.
True
False
____ 38. When an object is charged by contact, electrons flow from the ground onto the object, or from the object
onto the ground.
a.
b.
True
False
____ 39. In a parallel circuit, current in each branch is always the same.
a.
b.
True
False
____ 40. Ions are created when atoms gain or lose
a.
b.
c.
electrons.
protons.
neutrons.
____ 41. The images seen by your eyes are upside down.
a.
b.
true
false
____ 42. While standing at the edge of a canyon you shout across and hear your echo 3.00 seconds later. Given that
the speed of sound in air is 343 m/s, how wide is the canyon? (d = vt)
a.
b.
c.
1029 m
51.5 m
514.5 m
____ 43. A diffraction grating consists of
a.
b.
c.
many closely spaced parallel slits.
a crisscross pattern of narrow slits.
a single narrow slit.
____ 44. What is the equivalent resistance of the parallel portion of this circuit diagram?
a.
b.
c.
40 W
80 W
20 W
____ 45. Within an interference pattern, amplitudes are always increased.
a.
b.
True.
False.
____ 46. When slides are put upside down into a slide projector, the images shown on the screen are
a.
b.
upside down.
right side up.
____ 47. Power outlets in most American homes typically have an electric potential difference of
a.
b.
c.
30 V.
60 A.
120 V.
____ 48. Why does a charged comb attract an uncharged piece of paper?
a.
b.
c.
The comb induced polarization in the paper and the forces of attraction and repulsion on opposite
sides of the paper cancel.
The comb induces polarization in the paper and the forces of attraction and repulsion on the paper
disappear with the comb nearby.
The comb induces polarization in the paper and the force of attraction for the closer charge is greater
than the force of repulsion for the farther charge.
____ 49. In order to prevent overloading in a circuit, fuses are inserted in the circuit.
a.
b.
True
False
____ 50. Refraction occurs
a.
b.
c.
when a wave changes speed.
only at a wave front.
only with light waves.
Carefully review your answers on this progress test and make any corrections you feel are necessary. When
you are satisfied that you have answered the questions to the best of your ability, transfer your answers to the
online test submission page in the presence of your proctor.
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University of Nebraska. All rights reserved.

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