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Multiple Choice Quiz



1

How distant is a star with a parallax of 0.2 arcseconds?
A)0.2 parsecs
B)0.5 parsecs
C)2 parsecs
D)5 parsecs
2

By what factor would the brightness of a star increase if an observer moved from 3 parsecs to 1 parsec from the star?
A)3 times
B)9 times
C)27 times
D)81 times
3

Two stars that differ in magnitude by 10 have a brightness ratio of
A)10:1
B)100:1
C)200:1
D)10,000:1
4

The difference between the apparent and absolute magnitudes of a star is a measure of the star's
A)luminosity
B)temperature
C)brightness as we perceive it
D)distance
5

Star A is twice as hot as star B, but has only half the radius of star B. How does the luminosity of star A compare to that of star B.
A)A and B have the same luminosity
B)A is twice as luminous
C)A is 4 times as luminous
D)A is 16 times as luminous
6

Suppose we observe a cool, tenuous gas with a hotter 'black body' behind it. The combined spectrum will be
A)absorption lines only
B)continuous radiation only
C)continuous radiation with emission lines superimposed
D)continuous radiation with absorption lines superimposed
7

Which of the following processes will result in the emission of a photon?
A)the electron in an atom jumping to a higher energy level
B)the electron in an atom jumping to a lower energy level
C)an atom becoming ionized
D)the electron in an atom remaining in the ground state
8

The property of a star that determines its spectral class is
A)chemical composition
B)temperature
C)radial velocity
D)rate of rotation
9

What spectral class is just cooler than spectral class A?
A)O
B)B
C)F
D)K
10

An H-R diagram for a group of stars can be produced by plotting their
A)masses versus ages
B)magnitudes versus spectral types
C)temperatures versus colors
D)distances versus luminosities





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