AnswersPhysical ScienceN/A

N/A — Exam Answers

50 verified answers2 views
1
Free Preview

Based on the diagram, what can you conclude about the pole of the magnet?

A
It is a south pole because the field lines spread out from this end.
B
It is a north pole because the field lines spread out from this end.
C
It is a south pole because the field lines enter the magnet at this end.
D
It is a north pole because the field lines enter the magnet at this end.
2
Free Preview

What is the role of the part in the diagram labeled X?

A
change the pulse and phase of waves
B
modulate, amplify, and send out waves
C
capture, amplify, and demodulate waves
D
change the amplitude and frequency of waves
3

Which statement about the circuits is correct?

A
The bulbs in Circuit A shine brighter than those in Circuit B.
B
When a bulb in Circuit A goes out, the other bulbs keep shining.
C
When a bulb in Circuit B goes out, the other bulbs go out.
D
The total resistance in Circuit A is greater than that in Circuit B.
4

What can Lisa do to increase the strength of the electromagnet?

A
She can reduce the current in the wire.
B
She can use a nail with weaker magnetic properties.
C
She can change the direction of the nail.
D
She can increase the number of wire loops.
5

What can be predicted about the waves if they were to crash into each other?

A
The crest of Wave A would overlap the trough of Wave B.
B
The resulting wave would travel at 4 point 2 hertz.
C
Refraction would occur.
D
Interference would occur.
6

An object is moving east, and its velocity changes from 65 meters per second to 25 meters per second in 10 seconds. Which describes the acceleration?

A
negative acceleration of 4 the fraction with numerator m and denominator s squared
B
positive acceleration of 4 the fraction with numerator m and denominator s squared
C
positive acceleration of 9 the fraction with numerator m and denominator s squared
D
negative acceleration of 9 the fraction with numerator m and denominator s squared
7

Theresa comes up with four examples of waves: Sound wave, Ocean wave, Light wave, and Hand wave. Which of Theresa’as examples is not an actual scientific wave?

A
Light wave
B
Sound wave
C
Hand wave
D
Ocean wave
8

A magnet placed against the wall of a metal shed falls to the ground, where it attracts a nail. What is the most likely explanation for this observation?

A
The wall is the opposite pole from the magnet.
B
The shed is not made of iron or steel.
C
The magnet is not magnetized.
D
The nail pulled the magnet to the ground.
9

What is the kinetic energy of a toy truck with a mass of 0 point 7 5 kilograms and a velocity of 4 m/s ? (Formula: K⁢E=(1)/(2)⁢m⁢v^2 )

A
6 cap j
B
12 cap j
C
24 cap j
D
3 cap j
10

Which types of electromagnetic waves have frequencies that are higher than those of ultraviolet light but lower than those of gamma rays?

A
radio waves
B
X-rays
C
microwaves
D
infrared light
11

A person is pushing a box across a table. The measured forces on the box are 10 cap n , 14 cap n , negative 7 cap n , negative 10 cap n Which force is represented by negative 7 cap n ?

A
force of friction
B
normal force
C
push force
D
force of gravity
12

In an area of the deep ocean, hot magma emerges from a crack in Earth’s crust. Which statement describes what will happen to the seawater above the crack as a result of convection?

A
The water will become more dense and sink downward.
B
The water will become less dense and rise upward.
C
Water molecules will break apart and flow in a circular pattern.
D
Water molecules will bond together and rise upward.
13

On a test, Helena is defining energy. Which must she include in order to get her answer marked correct?

A
carrying through matter and space
B
the ability to do work
C
the bonds of atoms
D
making objects more compact
14

Which type of electromagnetic waves make up the colors of a rainbow seen after a storm?

A
ultraviolet light
B
visible light
C
X-rays
D
infrared light
15

Which wave is carrying the most energy?

A
Image with description A wave with very large amplitude.
B
Image with description A wave with large amplitude.
C
Image with description A wave with medium amplitude.
D
Image with description A wave with small amplitude.
16

Which term refers to the ability to do work?

A
energy
B
force
C
motion
D
power
17

A circuit contains two light bulbs connected in parallel. What would happen to the brightness of each light bulb if two more light bulbs were added in parallel to the first ones?

A
The brightness of each bulb would remain the same even though the total resistance of the circuit would decrease.
B
The brightness of each bulb would remain the same even though the total resistance of the circuit would increase.
C
The brightness of each bulb would increase because the total resistance of the circuit would increase.
D
The brightness of each bulb would decrease because the total resistance of the circuit would decrease.
18

What happens when someone lets go of the button on an electric doorbell?

A
The electromagnet gets stronger.
B
The current moving through the circuit changes direction.
C
The circuit is broken and the electromagnet turns off.
D
The metal striker hits the bell.
19

Kenneth ran a marathon ( 26 point 2 miles) in 5 point 5 hours. What was Kenneth’s average speed? (Round your answer to the nearest tenth.)

A
4 point 8 mph
B
144 point 1 mph
C
5 point 5 mph
D
0 point 2 mph
20

Which best describes what is required for any sound wave to travel?

A
liquid
B
empty space
C
solid
D
any medium

Did you find these answers helpful?

More from this Course

Quiz
50 verified answers

Exam

practice exam
32 verified answers

Practice Exam

practice exam
29 verified answers

Practice Exam