# Physics Involved With Astronomy Quiz

49 Questions | Attempts: 259  Settings  If you want to learn about astronomy science, then you should take this quiz it will helpful for you!

• 1.
If we use 1 millimeter to represent 1 light-year, how large in diameter is the Milky Way Galaxy?
• A.

1 million millimeters

• B.

1 kilometer

• C.

100 kilometers

• D.

100 millimeters

• E.

100 meters

• 2.
Why do the patterns of stars in our sky look the same from year to year?
• A.

Because the stars in the constellations are so far away

• B.

Because the stars in the constellations move so slowly- typically about the speed of a snail- that their motions are not noticeable

• C.

Because the stars in the constellations are not moving

• D.

Because the stars in the constellations all move at the same speeds and in the same directions, so they don't change their relative positions

• 3.
If the Earth's rotation axis was tilted by 45 degrees instead of 23.5 degrees, what are some of the implications, and why?
• A.

The seasons would be less extreme, because the Sun's rays would be less direct in the summer, and more direct in the winter

• B.

The seasons would be less extreme, because the surface of the Earth would be farther from the Sun in the summer, and closer to the Sun in the winter

• C.

The seasons would be more extreme, because the Sun's rays would be more direct in summer, and less direct in winter

• D.

The seasons would be more extreme, because the surface of the Earth would be closer to the Sun in the summer, and farther from the Sun in the winter

• 4.
An angle of 1 arc second is
• A.

Less than the thickness of a human hair held at arm's length

• B.

Slightly more than a width of a basketball held at arm's length

• C.

About the width of a finger held at arm's length

• D.

• 5.
For most of history, the lack of observable stellar parallax was interpreted to mean that
• A.

Stars were too far away for parallax to be measured with available technology

• B.

Earth is stationary at the center of the universe

• C.

Galileo's theories of the universe were essentially correct

• D.

Stars must all lie at the same distance from Earth, on the celestial sphere

• 6.
You are standing on Earth's equator. Which way is Polaris, the North star?
• A.

The answer depends on whether it's winter or summer

• B.

30 degrees up, due West

• C.

On the northern horizon

• D.

The answer depends on what time of day (or night) it is

• E.

• 7.
What happens during the apparent retrograde motion of a planet?
• A.

The planet moves backward through the sky

• B.

The planet moves backward in its orbit around the Sun

• C.

The planet moves through constellations that are not part of the zodiac

• D.

The planet rises in the west and sets in the east

• E.

The planet appears to move eastward with respect to the stars over a period of many nights

• 8.
How does a 12-month lunar calendar differ from our 12-month solar calendar?
• A.

It does not have seasons

• B.

It uses a 23-hour rather than a 24-hour day

• C.

It has about 11 fewer days

• D.

Its new year always occurs in February instead of on January 1

• 9.
Galileo observed all of the following. Which observation offered direct proof of a planet orbiting the Sun?
• A.

The Milky Way is composed of many individual stars

• B.

Patterns of shadow and sunlight near the dividing line between the light and dark portions of the Moon's face

• C.

Four moons of Jupiter

• D.

Phases of Venus

• 10.
Kepler's third law, =  means that
• A.

The period of a planet does not depend on its mass

• B.

A planet's period does not depend on the eccentricity of its orbit

• C.

All orbits with the same semi-major axis have the same period

• D.

Planets that are farther from the Sun move at slower average speeds than nearer planets

• E.

All of the above are correct

• 11.
The point along a planet's orbit where it is closest to the Sun is called the orbit's
• A.

Semi-major axis

• B.

Perihelion

• C.

Eccentricity

• D.

Aphelion

• E.

Period

• 12.
Which of the following statements about an ellipse is NOT true?
• A.

A circle is considered to be a special type of ellipse

• B.

The focus of an ellipse is always located precisely at the center of the ellipse

• C.

The semi-major axis of an ellipse is half the length of the longest line that you can draw across an ellipse

• D.

An ellipse with a large eccentricity looks much more elongated (stretched out) than an ellipse with a small eccentricity

• 13.
The astronauts feel weightless in the International Space Station, which orbits the Earth once every 90 minutes. Why?
• A.

Because the gravity from the Moon cancels out the gravity from Earth

• B.

Because there is no gravity in space

• C.

Because they are falling around the Earth

• D.

Because they are moving so fast

• 14.
As an interstellar cloud of hydrogen gas shrinks in size, its rate of rotation
• A.

Decreases, because the force of gravity strengthens as the cloud shrinks

• B.

Increases, because the force of gravity strengthens as the cloud shrinks

• C.

Decreases, because its angular momentum is conserved

• D.

Increases, because its angular momentum is conserved

• E.

Increases, because its total energy is conserved

• 15.
A net force acting on an object will always cause a change in the object's
• A.

Direction

• B.

Speed

• C.

Momentum

• D.

Mass

• 16.
A rock held above the ground has potential energy. As the rock falls, this potential energy is converted to kinetic energy. Finally, the rock hits the ground and stays there. What has happened to the energy?
• A.

The energy goes into the ground, and as a result, the orbit of the Earth about the Sun is slightly changed

• B.

It is transformed back into gravitational potential energy

• C.

The rock keeps the energy inside it in the form of mass-energy

• D.

The energy goes to producing sound and to heating the ground, rock, and surrounding air

• 17.
Newton showed that Kepler's laws are
• A.

Actually only three of seven distinct laws of planetary motion

• B.

Natural consequences of the law of universal gravitation

• C.

The key to proving that Earth orbits our Sun

• D.

Seriously in error

• 18.
What is the acceleration of gravity on Earth?
• A.

9.8 km/s downward

• B.

9.8 km/s^2 downward

• C.

9.8 m/s downward

• D.

9.8 m/s^2 downward

• E.

9.8 m^2/s downward

• 19.
Considering Einstein's famous equation, E=mc^2, which of the following statements is true?
• A.

You can make mass into energy if you can accelerate the mass to the speed of light

• B.

It takes a large amount of mass to produce a small amount of energy

• C.

A small amount of mass can be turned into a large amount of energy

• D.

One kilogram of mass represents 1 joule of energy

• E.

Mass can be turned into energy, but energy cannot be turned back into mass

• 20.
According to the universal law of gravitation, the force due to gravity is
• A.

Inversely proportional to the distance between objects

• B.

Directly proportional to the distance between objects

• C.

Not dependent on the distance between objects

• D.

Directly proportional to the square of the distance between objects

• E.

Inversely proportional to the square of the distance between objects

• 21.
According to the universal law of gravitation, if you double the masses of both attracting objects, then the gravitational force between them will
• A.

Decrease by a factor of 4

• B.

Increase by a factor of 2

• C.

Decrease by a factor of 2

• D.

Not change at all

• E.

Increase by a factor of 4

• 22.
The mass of Jupiter can be calculated by
• A.

Measuring the orbital period and distance of Jupiter's orbit around the Sun

• B.

Knowing the Sun's mass and measuring the average distance of Jupiter from the Sun

• C.

Measuring the orbital speed of one of Jupiter's moons

• D.

Knowing the Sun's mass and measuring how Jupiter's speed changes during its elliptical orbit around the Sun

• E.

Measuring the orbital period and distance of one of Jupiter's moons

• 23.
Suppose you drop a 10-pound weight and a 5-pound weight on the Moon, both from the same height at the same time. What will happen?
• A.

The 10-pound weight will hit the ground before the 5-pound weight

• B.

Both weights will float freely, since everything is weightless on the Moon

• C.

Both will hit the ground at the same time

• D.

The 5-pound weight will hit the ground before the 10-pound weight

• 24.
Compare the energy and speed of infrared and visible light. Which of the following statements is true?
• A.

Infrared light has higher energy, and moves faster

• B.

Infrared light has higher energy, but the same speed

• C.

Visible light has higher energy, and moves faster

• D.

Visible light has higher energy, but the same speed

• 25.
The angular separation of two stars is 0.1 arc seconds and you photograph them with a telescope that has an angular resolution of 1 arc second. What will you see?
• A.

You will see two distinct stars in your photograph

• B.

The photo will seem to show only one star rather than two

• C.

The two stars will appear to be touching, looking rather like a small dumbbell

• D.

The stars will not show up at all in your photograph

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