AnswersCrowley Credit Recovery Physics BUnit Test

Unit Test — Cumulative exam Answers

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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 short wavelengths, which can be harmful to healthy cells.
C
They do not transfer enough energy to destroy cancer cells.
D
They have long wavelengths, which can be harmful to healthy cells.
2
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The diagram shows the electric field lines around two charges.

Question illustration
A
They are negative, and they repel.
B
The left is negative and the right is positive, so they attract.
C
The left is positive and the right is negative, so they attract.
D
They are positive, and they repel.
3

Which electromagnetic wave transfers the least amount of energy?

A
gamma
B
X-ray
C
ultraviolet
D
microwave
4

Which statement is part of Dalton's atomic theory?

A
Matter is composed of small particles called atoms.
B
Atoms can be divided into their subatomic particles.
C
Atoms are able to be seen with proper spectroscopy equipment.
D
Chemical reactions can change atoms from one type to another.
5

The two waves shown here are the same distance from point X and are traveling toward each other.

Question illustration
A
0.0 cm
B
1.0 cm
C
2.0 cm
D
4.0 cm
6

A bell is rung. What best describes the density of air around the bell?

A
The air density does not change.
B
The air density increases and then returns to normal levels.
C
The air density decreases and then returns to normal levels.
D
The air density increases and decreases repeatedly before returning to normal.
7

The diagram shows light passing through an opening and forming bands.

Question illustration
A
n = 0 and n = 1
B
n = 0 and n = 3
C
n = 1 and n = 2
D
n = 2 and n = 3
8

The image shows the right-hand rule being used for a current-carrying wire.

Question illustration
A
When the current flows down the wire, the magnetic field flows out on the left side of the wire and in on the right side of the wire.
B
When the current flows up the wire, the magnetic field flows out on the left side of the wire and in on the right side of the wire.
C
When the current flows down the wire, the magnetic field flows in on the left side of the wire and out on the right side of the wire.
D
When the current flows up the wire, the magnetic field flows in on the left side of the wire and out on the right side of the wire.
9

Which diagram best illustrates the magnetic field of a bar magnet?

A
A bar magnet with a north and south pole. Field line vectors are leaving the north pole and curl around to the south pole.
Option A
B
A bar magnet with a north and south pole. Field line vectors are leaving the south pole and curl around to the north pole.
Option B
C
A bar magnet with a north and south pole. Field line vectors are leaving the north pole and curl around to the south pole.
Option C
D
A bar magnet with a north and south pole. Field line vectors are leaving the south pole and curl around to the north pole.
Option D
10

A wire is joined to points X and Y in the circuit diagram shown.How does the circuit change when the wire is added?

Question illustration
A
A closed circuit occurs and makes all bulbs turn off.
B
An open circuit occurs and makes all bulbs turn off.
C
A short circuit occurs and makes bulbs 3 and 4 turn off but keeps bulbs 1 and 2 lit.
D
A short circuit occurs and makes bulbs 1 and 2 turn off but keeps bulbs 3 and 4 lit.
11

A car makes sound as it moves toward a stationary observer. What best describes the sound wave heard by the observer compared with the sound heard by the car’s driver?

A
higher frequency; shorter wavelength
B
higher frequency; longer wavelength
C
lower frequency; shorter wavelength
D
lower frequency; longer wavelength
12

Which lists the correct steps that occur when using a diffraction grating to bend light?

A
diffracted wavelengths reach the eyes → different wavelengths of light bend at different angles → the eyes see different colors → light strikes the grooves
B
different wavelengths of light bend at different angles → light strikes the grooves → diffracted wavelengths reach the eyes → the eyes see different colors
C
diffracted wavelengths reach the eyes → the eyes see different colors → light strikes the grooves → different wavelengths of light bend at different angles
D
light strikes the grooves → different wavelengths of light bend at different angles → diffracted wavelengths reach the eyes → the eyes see different colors
13

Which statements correctly describe the effect of distance in determining the gravitational force and the electrical force? Check all that apply.

A
The gravitational force has an infinite reach.
B
The electrical force has an infinite reach.
C
The gravitational force is inversely proportional to the distance.
D
The electrical force is inversely proportional to the distance.
E
The gravitational force is inversely proportional to the square of the distance.
F
The electrical force is inversely proportional to the square of the distance.
14

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
0.2 seconds
B
2 seconds
C
5 seconds
D
10 seconds
15

Two identical waves are traveling toward each other in the same medium. One has a positive amplitude, meaning that its peaks only go upward, and the other wave has a negative amplitude, with peaks going downward.

A
constructive interference
B
destructive interference
C
a reflecting wave
D
wave refraction
16

Tony uses the device shown in the diagram to model how an electromagnet is used in his uncle’s scrap metal yard.

Question illustration
A
removing the battery
B
removing the iron nail
C
moving the wire loops closer together
D
spreading the wire loops farther apart
17

A –0.06 C charge is placed is in a uniform electric field with a strength of 200 N/C. What is the magnitude and direction of the force on the charge?

A
12 N in the opposite direction of the field
B
12 N in the same direction of the field
C
3333 N up in the opposite direction of the field
D
3333 N in the same direction of the field
18

Takumi works in his yard for 45 minutes each Saturday. He works in the morning, and he wears sunscreen and a hat each time he works in the yard.What does Takumi hope to reduce through his actions?

A
the likelihood of stochastic effects, such as DNA mutations
B
the severity of stochastic effects, such as cancer
C
the severity of non-stochastic effects, such as cancer
D
the likelihood of non-stochastic effects, such as radiation sickness
19

What is the main difference between a permanent magnet and a temporary magnet?

A
A permanent magnet is made of a ferromagnetic material, while a temporary magnet is not.
B
A temporary magnet attracts only metal objects, while permanent magnets attract both metal objects and other magnets.
C
The domains in a temporary magnet easily lose alignment, but the domains in a permanent magnet keep their alignment.
D
There are domains in a permanent magnet, but not in a temporary magnet.
20

A charge of 8.4 × 10–4 C moves at an angle of 35° to a magnetic field that has a field strength of 6.7 × 10–3 T.

A
9.1 × 10–5 m/s
B
1.3 × 10–4 m/s
C
7.6 × 103 m/s
D
1.1 × 104 m/s

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