Answers WV-Earth and Space Science A-CRUnit Test

Unit Test — Unit test Answers

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Consider the incomplete equation below If this equation was completed, which statement would it best support?

Nuclear fusion produces elements that are heavier than helium.

Nuclear fusion produces elements that are lighter than helium.

Nuclear fission produces elements that are heavier than helium.

Nuclear fission produces elements that are lighter than helium.

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Which type of reaction does this diagram represent?

nuclear fission because an atom is splitting into two fragments

nuclear fusion because the products that are produced are radioactive

nuclear fission because a large amount of energy is being released

nuclear fusion because atomic nuclei combine to form a heavier nucleus

Which best describes a chain reaction associated with a nuclear reaction?

Neutrons released during a fusion reaction cause other nuclei to fuse.

Neutrons released during a fission reaction cause other nuclei to split.

Helium nuclei released during a fission reaction cause other nuclei to split.

Helium nuclei released during a fusion reaction cause other nuclei to fuse.

A fusion reaction takes place between carbon and another element. Neutrons are released, and a different element is formed. The different element is

lighter than helium.

heavier than helium.

used for energy on Earth.

radioactive.

In the Sun, which element is the result of the fusion of hydrogen?

carbon

helium

oxygen

photon

A green dot in the middle of 4 concentric circles. The first away from the green dot is labeled n = 1. The second circle away from the green dot is labeled n = 2. The third circle away from the green dot is labeled n = 3 and the last is labeled n = 4. There is an arrow from n = 4 to n = 1 labeled A. There is an arrow from n = 3 to n = 2 labeled B. There is an arrow from n = 3 to n = 1 labeled C. There is an arrow from n = 2 to n = 1 labeled D.

The mass of the Sun is 2 × 1030 kg, and the distance between Neptune and the Sun is 30 AU. What is the orbital period of Neptune in Earth years?

30 Earth years

164 Earth years

3.8 × 1011 Earth years

2.3 × 1017 Earth years

Phobos orbits Mars in 27,553 s at a distance of 9.378 × 106 m. What is the mass of Mars?

2.58 × 1011 kg

2.05 × 1023 kg

6.43 × 1023 kg

1.09 × 1030 kg

Which type of reaction does this diagram represent?

nuclear fusion because nuclei combine to form a heavy nucleus

nuclear fission because an atom is splitting into two large fragments of comparable mass

nuclear fusion because a large amount of energy is being released

nuclear fission because the resulting products are not radioactive

Why is it important for scientists to replicate each other’s experiments?

to determine if important scientific results are repeatable

to help the research of other scientists

to determine if slight alterations in the experiment can affect the result

to further their own research

Which best describes what forms in nuclear fusion?

two smaller, more stable nuclei

two larger, less stable nuclei

one smaller, less stable nucleus

one larger, more stable nucleus

The table shows information about two of the major moons of Uranus.MoonOrbital Period (days)Average Distance from Uranus (km)Miranda0.319129,390Titania 8.71435,910What is the average distance between Miranda and Uranus?

2.84 × 104 km

1.29 × 105 km

1.47 × 106 km

4.65 × 107 km

Which would cause the greatest increase in the acceleration of a satellite?

a decrease in the radius and the tangential speed

an increase in the radius and the tangential speed

a decrease in the radius and an increase in the tangential speed

an increase in the radius and a decrease in the tangential speed

Which statement is true about nuclear fusion?

It is caused by the same process that causes nuclear fission.

It does not occur naturally in the solar system.

It has very low activation energy.

It produces nearly all the elements that are heavier than helium.

Lexy used the formula shown to calculate the force of gravity on a space shuttle.Fg = G

the difference between Earth’s mass and the space shuttle’s mass

the sum of Earth’s mass and the space shuttle’s mass

the mass of Earth

the mass of the space shuttle

How high above Earth is a satellite orbiting if its tangential velocity is 5000 m/s? Earth’s mass is kg and its radius is m.

1,500,000 m

2,240,000 m

9,608,000 m

16,008,000 m

Four students made a graphic organizer describing the parts of the atom.Which table best describes the parts of the atom?

A 3 column table with 3 rows. The first column is labeled particle with entries proton, electron, neutron. The second column is labeled charge with entries positive, 0, negative. The last column is labeled location with entries outside nucleus, outside nucleus, inside nucleus.

A 3 column table with 3 rows. The first column is labeled particle with entries proton, electron, neutron. The second column is labeled charge with entries negative, 0, negative. The last column is labeled location with entries inside nucleus, outside nucleus, inside nucleus.

A 3 column table with 3 rows. The first column is labeled particle with entries proton, electron, neutron. The second column is labeled charge with entries 0, negative, positive. The last column is labeled location with entries outside nucleus, inside nucleus, inside nucleus.

A 3 column table with 3 rows. The first column is labeled particle with entries proton, electron, neutron. The second column is labeled charge with entries positive, negative, 0. The last column is labeled location with entries inside nucleus, outside nucleus, inside nucleus.

The solar mass of the Sun is 1. The orbital period of Jupiter is 11.9 Earth years.

5.2 AU

41 AU

52 AU

410 AU

Which object would be considered to be in free fall?

one that experiences both friction and centripetal force

one that is truly weightless

one that is slowed down by air resistance

one with only gravity acting upon it

At 10–10 s during the evolution of the universe, formed, which are elementary particles that make up protons and neutrons.

Answer not available

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