Multiple Choice
Identify the
choice that best completes the statement or answers the question.
|
|
|
1.
|
Vega is 25 ly from Earth. What is the distance from Earth to Vega in
kilometres?
a. | 3.784 ´ 1011 | b. | 9.46 ´ 1012 | c. | 6.8 ´
1013 | d. | 2.365 ´
1014 |
|
|
|
2.
|
The Sun has a luminosity of
|
|
|
3.
|
The brightness of a star as observed from Earth depends on its luminosity and
its
a. | temperature | b. | composition | c. | distance | d. | colour |
|
|
|
4.
|
The absolute magnitude of a celestial object equals the apparent magnitude the
object would have if it were how many light years away from the observer?
|
|
|
5.
|
Which of the following stars gives off the most light?
a. | Sun; apparent magnitude: -26.8; absolute magnitude:
4.83 | b. | Sirius; apparent magnitude: -1.45; absolute magnitude:
1.5 | c. | Vega; apparent magnitude: 0.04; absolute magnitude: 0.5 | d. | Deneb; apparent
magnitude: 1.99; absolute magnitude: -7.5 |
|
|
|
6.
|
Stars with the highest surface temperature appear
a. | bluish | b. | reddish | c. | yellowish | d. | whitish |
|
|
|
7.
|
An example of a star that appears reddish is
a. | Spica | b. | Betelgeuse | c. | Vega | d. | Polaris |
|
|
|
8.
|
A massive cloud of interstellar gas and dust that forms the beginning phase of a
star is called a
a. | nebula | b. | white dwarf | c. | supernova | d. | neutron star |
|
|
|
9.
|
Nuclear fusion begins in the core of a protostar when it reaches what critical
temperature?
a. | 5 thousand °C | b. | 1 million °C | c. | 15 million
°C | d. | 5 billion °C |
|
|
|
10.
|
A star near the end of its life cycle with a mass that is equal to or smaller
than that of the Sun is called a
a. | white dwarf | b. | red giant | c. | red
supergiant | d. | blue supergiant |
|
|
|
11.
|
What determines the lifespan, size, and colour of a star?
a. | temperature | b. | composition | c. | brightness | d. | mass |
|
|
|
12.
|
Astronomers use the Hertzsprung-Russell diagram to
identify where stars are in their life cycle based on their
a. | mass and brightness | b. | temperature and composition | c. | luminosity and
temperature | d. | mass and luminosity |
|
|
|
13.
|
A small, hot, dim star created by the remaining material that is left when a red
giant dies is called a
a. | nebula | b. | protostar | c. | white
dwarf | d. | neutron star |
|
|
|
14.
|
The time it takes a protostar to collapse from a cool, dark gas cloud to a hot,
bright star depends on its
a. | brightness | b. | colour | c. | temperature | d. | mass |
|
|
|
15.
|
A large group of stars that together make an oval shape is called a(n)
a. | elliptical galaxy | b. | spiral galaxy | c. | lenticular
galaxy | d. | irregular galaxy |
|
|
|
16.
|
Which of the following categories contains the Milky Way galaxy?
a. | elliptical | b. | spiral | c. | lenticular | d. | irregular |
|
|
|
17.
|
Which of the following is a true statement regarding the Milky Way
galaxy?
a. | The Milky Way contains less than 10 billion stars. | b. | The Milky Way is
approximately 50 000 ly across. | c. | The Sun is located about 30 000 ly from the
centre of the Milky Way galaxy. | d. | The Milky Way has four spiral
arms. |
|
|
|
18.
|
Where in the Milky Way galaxy is our Solar System located?
a. | in the central bulge | b. | on the outer disc | c. | 1000 ly from the
central core | d. | on one of the spiral arms |
|
|
|
19.
|
The name of Canada’s first space telescope, launched in 2003, is
a. | HIPPARCOS | b. | Wilkinson Microwave Anisotropy
Probe | c. | Cosmic Background Explorer | d. | Microvariability and Oscillation of Stars
(MOST) |
|
|
|
20.
|
The theory that the Universe began in an incredibly hot, dense expansion
approximately 13.7 billion years ago is called the
a. | Solar Nebula Theory | b. | Red Shift | c. | Big Bang
Theory | d. | none of the above |
|