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

1. Which of the following is Betelgeuse?

A constellation

A star

A cluster

A nova

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

Time and temperature

Luminosity and time

Luminosity and temperature

Time and distance

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

820 K

8 200 K

58 000 K

5 800 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 cools.

The star shrinks and heats.

The star expands and heats.

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

Neutrons

Protons

Positrons

Neutrinos

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

Red giants

Supernovae

Asteroids

White dwarfs

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

no H-lines and no plateau.

H-lines and no plateau.

H-lines and a plateau.

no H-lines and a plateau.

8. The Chandrasekhar limit is

due to boson degeneracy.

caused by electrons being fermions.

the minimum mass of a black hole.

2.8 solar masses

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

Water

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.

10. Jocelyn Bell-Burnell discovered

pulsars

black holes

novae

supernovae