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

1. Which of the following is Betelgeuse?

A constellation

A nova

A cluster

A star

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

Luminosity and temperature

Time and temperature

Time and distance

Luminosity and time

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

8 200 K

820 K

58 000 K

5 800 K

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

The star expands and cools.

The star shrinks and heats.

The star shrinks and cools.

The star expands and heats.

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

Positrons

Neutrons

Protons

Neutrinos

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

Asteroids

Supernovae

White dwarfs

Red giants

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

no H-lines and no plateau.

H-lines and a plateau.

no H-lines and a plateau.

H-lines and no plateau.

8. The Chandrasekhar limit is

due to boson degeneracy.

2.8 solar masses

the minimum mass of a black hole.

caused by electrons being fermions.

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

supernovae

pulsars

black holes

novae