What percentage of stars are members of binary systems

Question

Assignment:

Question 1. The closest distance you can get from a black hole with some possibility of escaping is called the event horizon.

• True
• False

Question 2. The product of helium fusion is

• lead
• argon
• carbon
• zinc
• uranium

Question 3. It's possible for both hydrogen and helium reactions to occur simultaneously in the same star.

• True
• False

Question 4 Cygnus X-1 is

• a brand of motor oil
• non of these
• a black hole
• a galaxy

Question 5. Spheroidal-population stars tend to be located in our galaxy's halo.

• True
• False

Question 6. A neutron star is about the size of a

• planet
• none of these
• football field
• small city
• house

Question 7. Our galaxy has 100 thousand stars at the most.

• True
• False

Question 8. Stars tend to form in a spiral galaxy's arms.

• True
• False

Question 9. The cutoff point between high- and low-mass stars is

• half the mass of the Sun
• three times the mass of the Sun
• none of these
• all of these
• twice the mass of the Sun

Question 10. Stars in the process of forming are called

• protostars
• prestars
• quasars
• neostars
• none of these

Question 11. Nuclear fusion reactions can occur at temperatures below 10 thousand K.

• True
• False

Question 12. No star spends more than 70 percent of its life on the main-sequence.

• True
• False

Question 13. Many elements heavier than hydrogen and helium came into existence in the early history of the Universe.

• True
• False

Question 14. Our galaxy is unusual in that it lacks a supermassive black hole at its center.

• True
• False

Question 15. Near the end of a small star's life nuclear reactions involving many different kinds of atoms occur.

• True
• False

Question 16. The most common stars in the Universe have very high masses.

• True
• False

Question 17. About how long did it take the Sun to form?

• 10 thousand years
• 1 billion years
• 30 million years
• one-and-a-half years
• none of these

Question 18. The end stage of a star like the Sun will be a

• white dwarf
• all of these
• black hole
• neutron star
• none of these

Question 19. Degeneracy pressure is a consequence of quantum mechanics.

• True
• False

Question 20. There are occasions in close binary systems when stars can exchange mass.

• True
• False

Question 21. Most of our galaxy's matter is currently believed to be located in its halo.

• True
• False

Question 22. A planetary nebula is a planet in the process of forming.

• True
• False

Question 23. Helium capture reactions result in a relatively large amount of odd-numbered elements.

• True
• False

Question 24. Heavy elements---those more massive than hydrogen or helium---make up about 50% of the atoms in the Universe.

• True
• False

Question 25. A star that tried to form but failed is called a

• blue dwarf
• green dwarf
• red dwarf
• brown dwarf
• white dwarf

Question 26. No star in the Universe has more than 50 times the mass of the Sun.

• True
• False

Question 27. The Sun takes about how long to orbit the center of the galaxy.

• 5 years
• 1 million years
• 10 billion years
• 1 billion years
• 230 million years

Question 28. The crab nebular supernova was first observed

• just under a thousand years ago
• about a million years ago
• last week
• in 1968
• about three thousand years ago

Question 29. Stars become giant early in their lives.

• True
• False

Question 30. You can tell the difference between a nova and a supernova by measuring how bright they are.

• True
• False

Question 31. What do stars form from?

• polyunsaturated fats
• grains of iron
• all of these
• clouds of gas and dust
• none of these

Question 32. The heaviest element produced in a high-mass star before it turns into a supernova is

• plutonium
• xenon
• radium
• iron
• iodine

Question 33. About what percentage of stars are members of binary systems?

• 50
• 25
• 100
• 75
• 0