Test 5 - The closest distance you can get from a black hole

Test 5

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