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AS 101 astro final exam Wilfrid Laurier University
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AS 101 astro final exam Wilfrid Laurier University
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Which one of the following statements best describes the star τ (tau) Ceti, a star slightly smaller butsimilar to our sun.
generates energy by nuclear fusion
The number of stars in our Galaxy are estimated in the range 200-400 billion stars. In scientific notation
that is equivalent to:
(2.0-4.0) )×1011 stars
Q:3 What is the meaning of the following astronomical statement in relation to a star’s distance. You are
told that the star Vega or α (alpha) Lyrae is at a distance of d= 25.05 light years.
a. The star must be very old
*b. the light left the star 25.05 years ago
c. orbiting a different Solar System
d. located in the centre of the constellation of Lyra
Q:4 If we say that the Andromeda galaxy is 2,538, 000 light-years away, how does that affect how we see
it?
a. The star must be very old
*b. the light left the star 2.538×106 years ago
c. orbiting a different Solar System
d. located in the centre of the local supercluster
Q:5 If the life of a star is 5, 000,000,000 years and its distance from the Earth is 1,000, 000 ly is there any
chance that the star might be dead by now mean while its light is still traveling towards the Earth?
a. Yes
*b. No
c. Maybe
Q.6 What is the average distance of the Earth to the α (alpha) Centauri star?
a. 4.37 ly
*b. 5.2 ly
c. 4.0 ly
d 6.8 ly
Q.7 The following circle to represent the star Antares’ or α (alpha) Bootes diameter dAntares and the scale
given by the line segment = =100 RS ( equal to 100 times the radius of the sun). How big is
approximately Antares in relation to the sun?
a. 20 times c. 16 times
*b. 7 times d. 30 times
,Q.8 Which of the following is the smallest?
a. The size of a galaxy
b. The radius of the solar system
*c. The planet Jupiter diameter
d. The diameter of Antares
Q.9 It takes light 1.3 seconds to travel from the Moon to Earth and 8 minutes for light to travel from the
Sun to Earth. Which of the following statements is true?
a. The Sun is 6.2 times farther from Earth than the Moon
b. The Sun is 10 times farther from Earth than the Moon.
*c. The Sun is 370 times farther from Earth than the Moon
d. The Sun is 1800 times farther from Earth than the Moon
Q. 10 . If the apparent visual magnitude of a star is 9.3, what does this tell us about the brightness of the
star?
a. It is one of the brighter stars in the sky
b. It is bright enough that it would be visible even during the day.
c. It appears faint because of its great distance from the Earth
*d. It is not visible with the naked eye
Q.11 Which of the following describes the magnitude scale?
a. It originated just after the telescope was invented
*b. It can be used to indicate the apparent intensity of a celestial object.
c. It was used to determine the rate of precession
d. It is no longer used today
Q.12 If the apparent visual magnitude of star A is 8.1, and the apparent visual magnitude of star B is -1.6,
how do star A and star B compare in terms of apparent brightness as seen from Earth?
a. The star A is brighter than B
b. The star A is 10 times fainter than B
*c. Star B is brighter than A
d. Star B is 100 timer more distant than star A
Q.13 Given the following stars which is one is visible to the naked eye with no difficulty?
Star Magnitude
A 7.20
B 6.31
C -2.5
a. A
b. B
*c. C
Q.14 Where is the zenith for an observer standing at a point on the Earth’s North Pole?
a. The position depends on the time of day
b. Near the horizon and towards the west
*c. Directly above his head
,d. Near the horizon and towards the south
Q.15 For an observer in Halifax, at 44.6478° N, 63.5714° W, what is the angle between the northern
horizon and the north celestial pole?
a. 0 degrees
b. 37 degrees
*c. 44.6478 degrees
d. 63.5714 degrees
Q.16 A star is on the north point of the horizon. Where will the star be in 18 hours later.
D
B NCP C
Horizon A Horizon
N
STAR
a. D
b. C
c. A
*d. B
Q.17 Why did ancient astronomers believe that the Earth did not move?
a. Because they believed in circular motion
b. Because all observable planets follow retrograde motion
c. Because parallax is only detectable during the day
*d. Because they could not detect parallax
Q. 18 An observer in the northern hemisphere takes a time exposure photograph of the night sky. If the
illustration depicts the photograph taken by the observer, which direction was the camera pointing?
a. Due south
b. Due zenith
c. Due west
*d. Due north
Q. 19 An object has been located orbiting the Sun at a distance of 125 AU. What is the approximate
orbital period of this object?
a. 2000 y
b. 365 y
*c. 1397.54 y
, d. 120 y
Q. 20 An object has been orbiting the Sun with a period of 750 years. What is the approximate semimajor
axis of its orbit?
*a. 82.55 AU
b. 365 AU
c. 134 AU
d. 120 AU
Q.21 At which position (A, B, C) is the gravitational force of the Earth on the spaceship going to the
Moon is the greatest?
MOON EARTH
A B C
a. A
b. B
c. *C
Q. 22 Two metal spheres each have mass of 3.0 x 108 kg. If the gravitational force of attraction between
them is 37.5 N, what is the distance between their centers of mass?
*a. 400.1 m
b. 150 m
c. 399.5 m
d. 500 m
Q.23 X-rays easily penetrate the Earth’s atmosphere and reach the ground from space
a. True
*b. False
Q. 24 .What is the ratio of the light-gathering power of a future 40-metre telescope to that
of a 1-metre telescope
a. 40 to 1
b. 1 to 40
*c. 1600 to 1
d. 1 to 1600
Q. 25 What happens to a telescope’s light-gathering power and resolving power when you increase its
diameter?
a. Its light-gathering power increases and its resolving power decreases
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