AnswersBHS-Physics B-CRUnit Test

Unit Test — Cumulative exam Answers

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1
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A neon light consists of a glass tube with metal wires at each end. When connected to a high-voltage source, the gas glows.If a fly lands on the glass tube, what will most likely happen?

A
The fly will not feel a shock because the glass conducts any free electrons back into the gas.
B
Electrons will flow directly from the metal wires along the glass and shock the fly.
C
The fly will not feel a shock because the glass insulates it from the electrons in the gas and the metal.
D
Electrons that are moving through the gas will be conducted through the glass and shock the fly.
2
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What is the current in a circuit with a 9.0 V battery and a resistance of 36.0 Ω?

A
0.25 A
B
4.0 A
C
45 A
D
324 A
3

How does charging by conduction compare with charging by induction?

A
A charged object is needed in conduction but not in induction.
B
Two neutral objects are needed in conduction but not in induction.
C
Objects must touch in induction but not in conduction.
D
Oppositely charged objects form in induction but not in conduction.
4

Lidia makes a graphic organizer of the methods of charging.

Question illustration
A
Charged object must touch
B
Charged object must not touch
C
Electrons move
D
Protons move
5

An incident ray of light strikes a diamond at an angle of 45°. The index of refraction of air is 1.0003 and the index of refraction of a diamond is 2.42.

A
2°
B
17°
C
19°
D
45°
6

A series circuit contains three 2 Ω resistors and a 6 Ω resistor. The current in each resistor is 4.0 A.

A
2.0 V
B
3.0 V
C
32 V
D
48 V
7

A charge of 40 µC is pushed by a force of 15 µN a distance of 1.3 mm in an electric field.

A
2.0 × 10-8 V
B
4.6 × 10-7 V
C
4.9 × 10-4 V
D
3.8 × 10-1 V
8

The diagram shows the electric field around two charged objects.

Question illustration
A
W: PositiveX: Positive
B
W: NegativeX: Negative
C
W: NegativeX: Positive
D
W: PositiveX: Negative
9

_______interference occurs when two waves overlap and the resulting wave has a larger amplitude.

A
Destructive
B
Constructive
C
Reflection
D
Refraction
10

Which describes the movement of a fluid during convection?

A
Warm and cool fluids rise.
B
Warm and cool fluids sink.
C
Warm fluid rises and cool fluid sinks.
D
Warm fluid sinks and cool fluid rises.
11

Which animals can hear a sound wave that has 18,500 cycles in 0.75 seconds? Check all that apply.

A
bats
B
moths
C
cats
D
humans
E
birds
F
fish
G
crickets
12

Which type of circuit is a continuous loop that allows the flow of current along its intended path?

A
open
B
inverted
C
closed
D
short
13

Current X is 2.5 A and runs for 39 seconds. Current Y is 3.8 A and runs for 24 seconds.Which current delivered more charge, and how much more charge did it deliver?

A
X delivered 97.5 C more than Y.
B
X delivered 6.3 C more than Y.
C
Y delivered 91.2 C more than X.
D
Y delivered 1.3 C more than X.
14

What best describes white light as it travels through a prism? Check all that apply.

A
The light slows down.
B
The light bends in the prism.
C
Light reflects off of the surface of the prism.
D
The speed of light in the prism is 3.0 × 108 m/s.
E
The white light breaks into its component colors.
15

Which best describes fusion nuclear reactors?

A
They use rods containing uranium for fuel.
B
They are currently used for electricity in several highly populated countries.
C
They are used in some naval vessels, such as submarines.
D
They have been successful, but they are very expensive to operate.
16

Which applications, either for diagnostic purposes or for therapeutic purposes, involve the use of X-rays? Check all that apply.CT scanMRIradiographybrachytherapylaser eye surgeryradioisotope imagingexternal beam radiation therapyfluoroscopy

A
CT scan
B
MRI
C
radiography
D
brachytherapy
E
laser eye surgery
F
radioisotope imaging
G
external beam radiation therapy
H
fluoroscopy
17

Radioisotopes often emit alpha particles, beta particles, or gamma rays. The distance they travel through matter increases in order from alpha to gamma. Each radioisotope has a characteristic half-life, which is the time needed for half of a sample of radioisotope to undergo nuclear decay.Which quality is desirable for a radioisotope that is used for medical imaging of a specific organ? Check all that apply.half-life of several yearshalf-life of several dayshalf-life of several secondsemission of gamma raysemission of alpha particlesability to be attached to a compound used by the bodyability to pass through the body without being absorbed

A
half-life of several years
B
half-life of several days
C
half-life of several seconds
D
emission of gamma rays
E
emission of alpha particles
F
ability to be attached to a compound used by the body
G
ability to pass through the body without being absorbed
18

The table lists the values of the constants used to calculate the electrical force and the gravitational force.

Question illustration
A
The electrical force is much smaller than the gravitational force because 8.99 is much greater than 6.67.
B
The electrical force is much larger than the gravitational force because 8.99 is much greater than 6.67.
C
The electrical force is much smaller than the gravitational force because 109 is much greater than 10–11.
D
The electrical force is much larger than the gravitational force because 109 is much greater than 10–11.
19

Which characteristic is shared by all four fundamental forces?

A
large range
B
infinite range
C
repulsion
D
attraction
20

This diagram shows how loud certain frequencies must be in order for people of different ages to hear them. The needed intensity is called the "hearing level."

Question illustration
A
55
B
60
C
65
D
70

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