AnswersBHS-Physics B-CRUnit Test

Unit Test — Cumulative exam Answers

6 verified answers9 views
1
Free Preview

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.
2
Free Preview

Which are characteristics of a ray when it hits a boundary and reflects, but not when it hits the boundary and refracts? Check all that apply.changes direction changes speeddoes not change directiondoes not change speed bounces off the boundarypasses through the boundary

A
changes direction
B
changes speed
C
does not change direction
D
does not change speed
E
bounces off the boundary
F
passes through the boundary
3

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
4

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.
5

Describe the shape of liquid water as it is poured into a glass.

A
The shape stays the same as it was before it was poured.
B
The shape changes to fit the glass and then stays the same.
C
The shape stays the same, and the shape of the glass changes.
D
The shape changes and continues to change long after pouring stops.
6

What is the resistance in a circuit that carries a 0.75 A current when powered by a 1.5 V battery?

A
0.50 Ω
B
1.1 Ω
C
2.0 Ω
D
2.3 Ω
7

A wave has a wavelength of 3.3 m and a speed of 5.6 m/s. What is the frequency of this wave?

A
0.59 Hz
B
1.7 Hz
C
3.4 Hz
D
18 Hz
8

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.
9

Look at the two wave diagrams.

Question illustration
A
Wave A has a greater intensity and transfers more energy.
B
Wave B has a greater intensity and transfers more energy.
C
Wave A transfers more energy, but wave B has a greater intensity.
D
Wave B transfers more energy, but wave A has a greater intensity.
11

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
12

The speed of light in a vacuum is approximately 2.99 × 108 m/s, and the speed of light through a piece of glass is approximately 1.97 × 108 m/s.

A
0.66
B
1.52
C
1.02 × 108
D
4.96 × 108
13

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
14

At night, the demand for electricity supplied by a fission nuclear reactor decreases. How is the fission nuclear reaction controlled to avoid overproduction of electricity?

A
The temperature of the reactor is lowered because high temperature and pressure are needed.
B
The temperature of the reactor is raised because the reaction slows down at higher temperatures.
C
The exposure between the fuel rods and a neutron-absorbing material is increased.
D
The exposure between the fuel rods and a neutron-absorbing material is reduced.
15

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
16

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
17

The ratio of coils of wire in the primary winding to the secondary winding of a transformer is 3:2. 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 decreases to two-thirds the original.
C
It increases to three times the original.
D
It decreases to one-third the original.
18

Aluminum has a frequency threshold of 9.846 × 1014 Hz. Which best explains what will happen when light with a frequency below the frequency threshold strikes aluminum?

A
Electrons will be ejected immediately.
B
No electrons will be ejected.
C
Electrons will start being ejected several seconds after the light strikes the aluminum.
D
No electrons will be ejected unless the intensity is very high.
19

A circuit is built based on this circuit diagram.

Question illustration
A
0.61 Ω
B
1.6 Ω
C
7.5 Ω
D
18 Ω
20

A hot air balloon pilot wants the balloon to quickly rise several feet higher so it will be above some trees in the distance. Which best explains how the pilot can make the balloon rise?

A
The pilot can adjust the temperature inside the balloon so it is equal to the temperature of the surrounding air.
B
The pilot can adjust the density of the air inside the balloon so it is equal to the density of the surrounding air.
C
The pilot can decrease the temperature inside the balloon so it is cooler than the surrounding air.
D
The pilot can increase the temperature inside the balloon so it is warmer than the surrounding air.
21

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

Did you find these answers helpful?

More from this Course

RC
3 verified answers

Cumulative Exam

Assignment
24 verified answers

Cumulative Exam

Quiz
7 verified answers

Unit Test