AnswersSLPS-2001310-EarthSpace B -GFClassification of Living Things

Unit 6: Test Answers

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A
gravitational
B
electromagnetic
C
strong
D
weak
2
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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.
3

Which is an example of the strong force in action?

A
A battery-powered radio produces sound.
B
A magnet keeps a cabinet door closed.
C
The Sun pulls on Earth as Earth moves around the Sun.
D
The protons in the nucleus of a carbon atom are held together.
4

Which statement describes why energy is released in a nuclear fission reaction based on mass-energy equivalence?

A
For large nuclei, the mass of the original nucleus is greater than the mass of the products.
B
For large nuclei, the mass of the original nucleus is less than the mass of the products.
C
For small nuclei, the binding energy of the lighter nuclei is greater than the binding energy of the heavier nucleus.
D
For small nuclei, the binding energy of the lighter nuclei is less than the binding energy of the heavier nucleus.
5

Observable matter makes up about what percentage of the universe?

A
5%
B
10%
C
50%
D
95%
6

Which is a type of star system?

A
dim stars
B
solar system planets
C
wobbling stars
D
globular clusters
7

Roberto makes a graphic organizer to compare fusion nuclear reactions and fission nuclear reactions.

Question illustration
A
X: Smaller nuclei formY: Thermal energy is producedZ: A larger nucleus forms
B
X: Large amounts of energy are releasedY: One or more neutrons is releasedZ: Smaller nuclei form
C
X: One or more neutrons is releasedY: A larger nucleus formsZ: Large amounts of energy are released
D
X: A larger nucleus formsY: Large amounts of energy are releasedZ: Smaller nuclei form
8

The table shows data for the planet Uranus.

Question illustration
A
170 N
B
218 N
C
430 N
D
532 N
9

What is the Milky Way?

A
a spiral galaxy in which Earth is located
B
an elliptical galaxy in which Earth is located
C
an irregular galaxy in which Earth is located
D
the closest galaxy to the one in which Earth is located
10

The gravitational force between two asteroids is 6.2 × 108 N. Asteroid Y has three times the mass of asteroid Z.

A
3.7 × 1015 kg
B
1.1 × 1016 kg
C
1.4 × 1031 kg
D
4.1 × 1031 kg
11

mass-energy equivalencemass defectbinding energymass-energy conservation

A
mass-energy equivalence
B
mass defect
C
binding energy
D
mass-energy conservation
12

Which quantity does a light-year measure?

A
distance
B
speed
C
time
D
volume
13

The acceleration due to gravity on Mercury is 3.7 m/s2, which is about six times the acceleration due to gravity on Pluto.

A
An object weighs about one-sixth as much and has about one-sixth the mass on Pluto as on Mercury.
B
An object weighs about one-sixth as much but has the same mass on Pluto as on Mercury.
C
An object weighs the same but has about one-sixth the mass on Pluto as on Mercury.
D
An object weighs the same and has the same mass on Pluto as on Mercury.
14

What was discovered in 1965 and is believed to be leftover thermal energy from the big bang?

A
red shift
B
the Eagle Nebula
C
the Doppler effect
D
background radiation
15

In the equation for the gravitational force between two objects, what does G represent?

A
the gravitational constant
B
the gravitational force
C
the gravitational field strength
D
the gravitational acceleration
16

Which is the final event that occurs when a star is forming?

A
The outer layer of the star expands.
B
Gravity pulls gas and dust together.
C
A black hole forms as the core collapses.
D
Nuclear fusion begins under high pressure.
17

Look at the graph below.

Question illustration
A
line
B
bar
C
scatterplot
D
histogram
18

Which discovery did Galileo make to support the theory that the planets, including Earth, orbit the Sun?

A
Venus has phases.
B
The orbits of the planets are elliptical
C
Earth’s rotation causes the Sun to rise in the sky.
D
The planets move faster when they orbit closer to the Sun.
19

Why are there two high tides a day about 12 hours apart from each other?

A
Earth revolves around the Sun once during that time.
B
Earth rotates entirely on its axis once during that time.
C
The moon revolves around Earth once during that time.
D
The moon’s orbit is in line with Earth’s orbit twice a day.
20

Bees can see into the ultraviolet region of the electromagnetic spectrum. Compared with humans, bees can sense electromagnetic waves that have

A
a lower frequency and a shorter wavelength.
B
a higher frequency and a longer wavelength.
C
a lower frequency and a longer wavelength.
D
a higher frequency and a shorter wavelength.

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