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Based on the field lines, what is the best description of the charges?

A
They are positive, and they repel.
B
The left is positive and the right is negative, so they attract.
C
They are negative, and they repel.
D
The left is negative and the right is positive, so they attract.
2
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After picking up several staples with the device, what change would enable Tony to drop the staples in the scrap metal bin?

A
removing the iron nail
B
spreading the wire loops farther apart
C
removing the battery
D
moving the wire loops closer together
3

Which statement belongs in the region marked X?

A
The main charge carriers are negative electrons.
B
The base is the center layer.
C
The base is more negative than the emitter.
D
The current flows toward the base from the emitter.
4

Which shows the motion of the rope at Point P as the wave passes through it?

A
Image with description A dot with a vector drawn up to the right and a vector drawn down to the left.
B
Image with description A dot with a vector drawn right and a vector drawn left.
C
Image with description A dot vector drawn up and vector drawn down.
D
Image with description A dot with a vector drawn up to the left and a vector drawn down to the right.
5

What is the equivalent resistance of the circuit?

A
1.6 Ω
B
18 Ω
C
7.5 Ω
D
0.61 Ω
6

Which best completes the chart?

A
Space is three-dimensional.
B
Space is four-dimensional.
C
The speed of light varies.
D
The speed of light is absolute.
7

Which describes the image produced by the lens?

A
real and larger than the object
B
upright and larger than the object
C
inverted and larger than the object
D
real and smaller than the object
8

What is the bes t conclusion about the charges that can be made based on the diagram?

A
Y and Z are like charges, but their identities cannot be determined.
B
Y is negative, and Z is negative.
C
Y and Z are opposite charges, but their identities cannot be determined.
D
Y is negative, and Z is positive.
9

Which best describes how the image of the vase will appear?

A
It will be smaller than the vase and inverted.
B
It will be larger than the vase and upright.
C
It will be larger than the vase and inverted.
D
It will be smaller than the vase and upright.
10

By which factor is the sound intensity decreased at 3 meters?

A
1 fourth
B
1 ninth
C
1 half
D
1 third
11

A boat moves up and down on a lake as a wave passes by. If the boat oscillates 10 times in 2 seconds, what is the period of the wave?

A
10 seconds
B
5 seconds
C
0 point 2 seconds
D
2 seconds
12

Force cap f acts between two charges, q sub 1 and q sub 2 , separated by a distance d If q sub 1 is increased to twice its original value and the distance between the charges is also doubled, what is the new force acting between the charges in terms of cap f ?

A
1 fourth cap f
B
1 half cap f
C
cap f
D
2 cap f
13

What is the best description of a wave?

A
a disturbance that moves matter
B
a medium disturbed by a vibration
C
matter that is moved from one place to another
D
a pulse that carries energy
14

Aluminum has a frequency threshold of 9 point 8 4 6 times 10 to the 14th power Hz Which best explains what will happen when light with a frequency below the frequency threshold strikes aluminum?

A
No electrons will be ejected.
B
No electrons will be ejected unless the intensity is very high.
C
Electrons will be ejected immediately.
D
Electrons will start being ejected several seconds after the light strikes the aluminum.
15

Which electromagnetic wave transfers the least amount of energy?

A
cap x -ray
B
ultraviolet
C
gamma
D
microwave
16

How much time was required? A current of 1 point 8 cap A delivers 2 point 5 cap c of charge.

A
4 point 5 s
B
0 point 7 0 s
C
1 point 4 s
D
0 point 7 2 s
17

Which factors affect the strength of a magnetic field around a current-carrying wire? Choose two correct answers.

A
the temperature of the wire
B
the type of metal of the wire
C
the direction of the current
D
the distance from the wire
E
the amount of the current
18

Which best describes an example of an n-type semiconductor?

A
It uses gallium so that electrical conduction is due to the movement of a positive charge.
B
It uses gallium so that electrical conduction is due to the movement of electrons.
C
It uses phosphorus so that electrical conduction is due to the movement of electrons.
D
It uses phosphorus so that electrical conduction is due to the movement of a positive charge.
19

Which best explains why infrared waves are ineffective for treating cancer?

A
They have frequencies that are too high to kill cancer cells.
B
They have long wavelengths, which can be harmful to healthy cells.
C
They do not transfer enough energy to destroy cancer cells.
D
They have short wavelengths, which can be harmful to healthy cells.
20

The ratio of coils of wire in the primary winding to the secondary winding of a transformer is ratio of 3 to 2 How does the transformer change the voltage of a current applied to the primary winding?

A
It increases to three-halves times the original.
B
It increases to three times the original.
C
It decreases to one-third the original.
D
It decreases to two-thirds the original.

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