1. What proportion of stars are members of multiple star systems? A. Less than 1

Question

1. What proportion of stars are members of multiple star systems?

A. Less than 10% B. Between 10% and 40% C. Between 40% and 50% D. More than 50%

2. What do we need to know to determine the size of a star?

A. Its temperature and age B. Its temperature and absolute magnitude C. Its temperature and radial velocity D.Its radial velocity and apparent magnitude

3. Why are eclipsing binary systems important?

A. Eclipses give information on the stars’ atmospheres B. They yield data on stellar masses and sizes C. Evolution proceeded differently in such systems D. They are very young stars

4. A parsec is the

A. distance the Earth moves in its orbit in one second B. angle through which the Earth moves in its orbit in one second C. distance light travels in one second D. distance of a star when its parallax angle is one arcsecond

5. If a star is 30 parsecs away, what is its approximate distance in light years?

A. 900 B. 300 C. 100 D. 30

Explanation / Answer

1.D. More than 50%

2. B.its temperature and absolute magnitude

3. B. They yield data on stellar masses and sizes

4. D. distance of a star when its parallax angle is one arcsecond

5. C.100

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