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Study Quizzes

Please read each question and select your answer from the choices provided. You must complete all of the questions in order to view your results. At the end of each exam, you have the option to e-mail your results to your instructor.


1:  A star's parallax is 0.1 arcsecond. The star's distance from us is
A: 10 light-years.
B: 10 AU.
C: 10 parsecs.
D: 0.1 parsec.
E: 0.1 light-year.

2:  A star's apparent magnitude is +8 and its absolute magnitude is -2. The star's distance from us is
A: 1000 parsecs.
B: 100 parsecs.
C: 1000 light-years.
D: 1000 AU.
E: 10 light-years.

3:  Star X has twice the radius and twice the temperature of star Y. Therefore, the luminosity of star X is _____ times greater than the luminosity of star Y.
A: 4
B: 8
C: 16
D: 64
E: 128

4:  On the H-R diagram, a star's temperature is greater than the Sun's but the star is less luminous than the Sun. We conclude that the star is
A: a cool giant.
B: a hot supergiant.
C: located below and to the right of the Sun on the diagram.
D: located above and to the left of the Sun on the diagram.
E: a white dwarf.

5:  Two stars have the same luminosity but one of them is a B-type star, while the other is a K-type star. Which of the following is correct?
A: The temperature of the K-type star is greater than that of the B-type star.
B: The radius of the K-type star is greater than that of the B-type star.
C: The radius of the B-type star is greater than that of the K-type star.
D: The spectral types of the stars do not tell us anything about their surface temperatures.
E: (Both B and D.)

6:  On the main sequence, the greater the luminosity of a star, the greater its
A: temperature.
B: radius.
C: mass.
D: (Both A and C.)
E: (Both A and B.)

7:  A binary star system is observed whose orbital plane is perpendicular to the line of sight. This system cannot be detected as a spectroscopic binary because
A: it is actually an eclipsing binary system.
B: the Doppler shift will be too great.
C: no Doppler shift will be observed.
D: the system is too far away.
E: (None of the above.)

8:  When we study an eclipsing binary system, we can obtain information about
A: the radii of the two stars.
B: the masses of the two stars.
C: the orbital periods of the two stars.
D: the size of the orbit.
E: (All of the above.)

9:  Cepheid variable stars
A: are pulsating stars with periods greater than about a day.
B: have absolute magnitudes that are linearly related to their pulsation periods.
C: have luminosities that are linearly related to their pulsation periods.
D: (All of the above.)
E: (Both A and B, but not C.)

10:  Which of the following is a complete list of the parameters whose values we need to know in order to find the distance to a star?
A: We need to know the star's temperature, apparent magnitude, and luminosity class
B: We need to know the star's temperature, apparent magnitude, and spectral type.
C: We need to know the star's radius, apparent magnitude, and mass.
D: We need to know the star's luminosity and spectral type.
E: We need to know the star's luminosity class and mass.

Optional: Enter your name and your instructor's E-mail address to have your results E-mailed to him or her.
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