Exploring the Cosmos - Degree Exam 2011 - Life and Death of Stars (Part 2)

1. Which of the following is Betelgeuse?

A nova

A cluster

A constellation

A star

2. The Hertzprung-Russell diagram relates which two properties of a star?

Luminosity and time

Time and distance

Time and temperature

Luminosity and temperature

3. The surface temperature of a type G2 star is about what?

820 K

5 800 K

58 000 K

8 200 K

4. If the core temperature of a main sequence star increases, what happens to it?

The star shrinks and cools.

The star expands and heats.

The star expands and cools.

The star shrinks and heats.

5. Which of the following tends to escape the core of a star?

Positrons

Neutrinos

Neutrons

Protons

6. A planetary nebula is associated with which of the following?

White dwarfs

Red giants

Asteroids

Supernovae

7. The light curve of a type-II supernova has

H-lines and no plateau.

no H-lines and no plateau.

no H-lines and a plateau.

H-lines and a plateau.

8. The Chandrasekhar limit is

the minimum mass of a black hole.

due to boson degeneracy.

caused by electrons being fermions.

2.8 solar masses

9. Neutron stars are approximately as dense as which of the following?

The mass of the Earth squashed into a thimble.

The mass of the Sun squashed into the volume of the Earth.

A mountain squashed into a thimble.

Water

10. Jocelyn Bell-Burnell discovered

novae

pulsars

black holes

supernovae