STUDENTS SUCCESS
Revision Examination Tests
“Come all for this greatness”
...100% Correct Ans...
MNB1601 PACK ASSIGNMENT 6 SEMESTER 2 2024/2025 -
DISTINCTION GUARANTEED 100%
Sunspots appear darker then their surroundings because they
ans:> Are cooler than their surroundings
What is solar wind?
ans:> A stream of shared particles flowing outward from the surface of
the Sun
How does the number of neutrinos passing though your body at night
compare with the number passing through your body during the day?
ans:> About the same
Which of these star clusters is oldest
ans:> A cluster whose brightest main-sequence stars are yellow
If the Star Alpha Centauri were moved to a distance 10 times farther
than it is now, its parallax angle would
ans:> Get smaller
X-ray images of the Sun generally show the
ans:> Corona
Listed following are events or phenomena that occur during either the
part of the sunspot cycle known as solar minimum or the part known as
solar maximum. Match these items to the correct part of the sunspot
cycle.
ans:> Solar Maximum:
-Occurs about 11 years after a solar maximum (on average)
-Solar flares are most common
-Auroras are most likely in Earth's skies
,-Sunspots are most numerous on the Sun
-Orbiting satellites are most at risk
Solar Minimum:
-Occurs about 5 to 6 years after a solar maximum (on average)
Energy balance in the Sun refers to a balance between...
ans:> The rate at which fusion generates energy in the Sun's core and
the rate at which the Sun's surface radiates energy into space
Before we can use parallax to measure the distance to a nearby star, we
first need to know...
ans:> The Earth-Sun distance
Which of the following is a valid way of demonstrating parallax for
yourself?
ans:> Hold up your hand in front of your face, and alternately close you
left and right eyes
What is the cause of seller parallax?
ans:> Earth's orbit around the Sun
The more distant a star, the....
ans:> smaller its parallax angle
Approximately what is the parallax angle of a star that is 20 light-years
away?
ans:> 0.16 arcsecond
Suppose that a star had a parallax angle of exactly 1 arc second.
Approximately how far away would it be, in light-years?
ans:> 3.3 light-years away
Which of the following best explains why nuclear fusion requires bringing
nuclei extremely close together?
ans:> Nuclei normally repel because they are all positively charged and
can be made to stick only when brought close enough for the strong
force to take hold.
Compared to a main-sequence star with a short lifetime, a main-
sequence star with a long lifetime is...
ans:> Less luminous, cooler, smaller, and less massive
,Compared to a high-luminosity main-sequence star, stars in the upper
right of the H-R diagram are
ans:> Cooler and larger in radius
Compared to a low-luminosity main-sequence star, stars in the lower left
of the H-R diagram are...
ans:> Hotter and smaller in radius
All stars are born with the same basic composition, yet stars can look
quite different from one another. Which two factors primarily determine
the characteristics of a star?
ans:> Its mass and its stage of life
Which of the following statements about spectral types of stars is not
generally true?
ans:> The spectral type of a star can be used to determine its distance.
In the late 1800s, Kelvin and Helmholtz suggested that the Sun stayed
hot due to gravitational contraction. What was the major drawback to this
idea?
ans:> It predicted that the Sun could shine for about 25 million years, but
geologists had already found that Earth is much older than this.
From center outward, which of the following lists the "layers" of the Sun
in the correct order?
ans:> core, radiation zone, convection zone, photosphere,
chromosphere, corona
Red arrows point outward, green arrows point inward. Long arrows are
near the center, short arrows near the outer surface.
The arrows in this diagram are meant to show how gravitational
equilibrium works in the Sun. What do the different colors and different
arrow lengths represent?
ans:> Green arrows represent gravity; red arrows represent pressure;
longer arrows represent a stronger push or pull.
What layer of the Sun are we seeing in this photo?
ans:> Photosphere
The dark spots in this photo (such as the one indicated by the arrow)
represent what we call:
ans:> Sunspots
, This photograph shows a small portion of the Sun's photosphere. What
is going on in the bright regions (such as the bright region indicated by
the arrow)?
ans:> Hot gas is rising up from the solar interior.
This X-ray image shows a loop of hot gas above the surface of the Sun.
If we took a visible light photo that looked in the Sun's photosphere just
under the two points where the loop of gas comes down (arrows), what
would we find?
ans:> Sunspots
Look again at the loop of hot gas in this X-ray image. Suppose we took
another photo looking at the same place one hour later. What would we
see?
ans:> The loop would look about the same as it does in this photo.
What layer of the Sun are we seeing in this photograph, and in what
wavelength band was it photographed?
ans:> corona, photographed in X rays
What do the yellow regions represent in this photograph?
ans:> regions where very hot gas is emitting a lot of X rays
Study this figure and its axis labels. What is this graph showing us?
ans:> The number of sunspots on the Sun tends to increase and
decrease with an approximately 11-year cycle.
How is the sunspot cycle directly relevant to us here on Earth?
ans:> Coronal mass ejections and other activity associated with the
sunspot cycle can disrupt radio communications and knock out sensitive
electronic equipment.
Which of these groups of particles has the greatest mass?
ans:> Four individual protons
Which of these things poses the greatest hazard to communications
satellites?
ans:> Particles from the Sun
At the center of the Sun, fusion converts hydrogen into...
ans:> helium, energy, and neutrinos.
Revision Examination Tests
“Come all for this greatness”
...100% Correct Ans...
MNB1601 PACK ASSIGNMENT 6 SEMESTER 2 2024/2025 -
DISTINCTION GUARANTEED 100%
Sunspots appear darker then their surroundings because they
ans:> Are cooler than their surroundings
What is solar wind?
ans:> A stream of shared particles flowing outward from the surface of
the Sun
How does the number of neutrinos passing though your body at night
compare with the number passing through your body during the day?
ans:> About the same
Which of these star clusters is oldest
ans:> A cluster whose brightest main-sequence stars are yellow
If the Star Alpha Centauri were moved to a distance 10 times farther
than it is now, its parallax angle would
ans:> Get smaller
X-ray images of the Sun generally show the
ans:> Corona
Listed following are events or phenomena that occur during either the
part of the sunspot cycle known as solar minimum or the part known as
solar maximum. Match these items to the correct part of the sunspot
cycle.
ans:> Solar Maximum:
-Occurs about 11 years after a solar maximum (on average)
-Solar flares are most common
-Auroras are most likely in Earth's skies
,-Sunspots are most numerous on the Sun
-Orbiting satellites are most at risk
Solar Minimum:
-Occurs about 5 to 6 years after a solar maximum (on average)
Energy balance in the Sun refers to a balance between...
ans:> The rate at which fusion generates energy in the Sun's core and
the rate at which the Sun's surface radiates energy into space
Before we can use parallax to measure the distance to a nearby star, we
first need to know...
ans:> The Earth-Sun distance
Which of the following is a valid way of demonstrating parallax for
yourself?
ans:> Hold up your hand in front of your face, and alternately close you
left and right eyes
What is the cause of seller parallax?
ans:> Earth's orbit around the Sun
The more distant a star, the....
ans:> smaller its parallax angle
Approximately what is the parallax angle of a star that is 20 light-years
away?
ans:> 0.16 arcsecond
Suppose that a star had a parallax angle of exactly 1 arc second.
Approximately how far away would it be, in light-years?
ans:> 3.3 light-years away
Which of the following best explains why nuclear fusion requires bringing
nuclei extremely close together?
ans:> Nuclei normally repel because they are all positively charged and
can be made to stick only when brought close enough for the strong
force to take hold.
Compared to a main-sequence star with a short lifetime, a main-
sequence star with a long lifetime is...
ans:> Less luminous, cooler, smaller, and less massive
,Compared to a high-luminosity main-sequence star, stars in the upper
right of the H-R diagram are
ans:> Cooler and larger in radius
Compared to a low-luminosity main-sequence star, stars in the lower left
of the H-R diagram are...
ans:> Hotter and smaller in radius
All stars are born with the same basic composition, yet stars can look
quite different from one another. Which two factors primarily determine
the characteristics of a star?
ans:> Its mass and its stage of life
Which of the following statements about spectral types of stars is not
generally true?
ans:> The spectral type of a star can be used to determine its distance.
In the late 1800s, Kelvin and Helmholtz suggested that the Sun stayed
hot due to gravitational contraction. What was the major drawback to this
idea?
ans:> It predicted that the Sun could shine for about 25 million years, but
geologists had already found that Earth is much older than this.
From center outward, which of the following lists the "layers" of the Sun
in the correct order?
ans:> core, radiation zone, convection zone, photosphere,
chromosphere, corona
Red arrows point outward, green arrows point inward. Long arrows are
near the center, short arrows near the outer surface.
The arrows in this diagram are meant to show how gravitational
equilibrium works in the Sun. What do the different colors and different
arrow lengths represent?
ans:> Green arrows represent gravity; red arrows represent pressure;
longer arrows represent a stronger push or pull.
What layer of the Sun are we seeing in this photo?
ans:> Photosphere
The dark spots in this photo (such as the one indicated by the arrow)
represent what we call:
ans:> Sunspots
, This photograph shows a small portion of the Sun's photosphere. What
is going on in the bright regions (such as the bright region indicated by
the arrow)?
ans:> Hot gas is rising up from the solar interior.
This X-ray image shows a loop of hot gas above the surface of the Sun.
If we took a visible light photo that looked in the Sun's photosphere just
under the two points where the loop of gas comes down (arrows), what
would we find?
ans:> Sunspots
Look again at the loop of hot gas in this X-ray image. Suppose we took
another photo looking at the same place one hour later. What would we
see?
ans:> The loop would look about the same as it does in this photo.
What layer of the Sun are we seeing in this photograph, and in what
wavelength band was it photographed?
ans:> corona, photographed in X rays
What do the yellow regions represent in this photograph?
ans:> regions where very hot gas is emitting a lot of X rays
Study this figure and its axis labels. What is this graph showing us?
ans:> The number of sunspots on the Sun tends to increase and
decrease with an approximately 11-year cycle.
How is the sunspot cycle directly relevant to us here on Earth?
ans:> Coronal mass ejections and other activity associated with the
sunspot cycle can disrupt radio communications and knock out sensitive
electronic equipment.
Which of these groups of particles has the greatest mass?
ans:> Four individual protons
Which of these things poses the greatest hazard to communications
satellites?
ans:> Particles from the Sun
At the center of the Sun, fusion converts hydrogen into...
ans:> helium, energy, and neutrinos.
