Question

1. Inside a Red Giant, denser elements fuse and emit sufficient energy to balance thermal expansion versus gravity, until fusion of:

		silica & sulphur
		helium
		carbon & oxygen
		iron
		deuterium & tritium

2. Structure of the Universe: 2dF and the Sloan Microwave Digital Survey plotted clusters of galaxies. What kind of structure was seen among super-clusters of galaxies?

		Filaments of galaxies surround voids that have no or very few galaxies inside.
		Super-clusters expand outward from a Big Bang source.
		Super-clusters are uniform & homogeneous across the universe.
		Each cluster of galaxies is the same size.

3. Galaxies move about the center of mass of their supercluster, sometimes merging due to:

		gravity
		Hubble's constant
		dark energy
		galactic currents

4. Uranus’s rotational axis points toward:

		perpendicular to the ecliptic plane
		an object almost in line with the ecliptic plane
		Saturn
		Polaris
		Sun

5. What would be found on the Main Sequence?

		red supergiants
		super massive black holes
		Cepheid variables
		sun-like stars
		white dwarfs

6. Which kind of galaxies are compact, have only visible red dwarfs, have little dust & gas but no disk or arms?

		spiral
		dwarf
		elliptical
		lenticular
		irregular

7. After the red supergiant phase, if the stellar core retains two solar masses, the result would be a:

		supernova
		black hole
		white dwarf
		neutron star

8. Every star emits "black body" radiation described by Wein's Law: At the peak radiation, the wavelength is inversely proportional to...

		fusion density
		photosphere temperature
		emitted intensity
		core temperature
		speed of light

9. How would we recognize the presence of a black hole?

		Find star(s) orbiting a blank spot.
		Identify an accretion disk emitting x-rays.
		Find an astrometric binary with a massive companion.
		All of these answers would work.

10. Direct observations of the trajectories of stars travelling near the center of our Milky Way Galaxy provide very strong evidence for the presence of a supermassive black hole, millions of times the mass of our Sun.

True

False

11. To calculate the distance a star is from us, we measure the apparent magnitude and compare with the absolute magnitude of the star. We know that the intensity, I, diminishes with increased distance, D, (I is inversely proportional to D squared). Identify an object for which we know the absolute magnitude.

		binary stars
		brown giants
		long period variables
		Cepheids

Answer 1

1 untill the fusion of carbon and oxygen , answer is 3 , when a star is completely exhausted of hydrogen then it becomes giant or supergiant.

2 Since the universe is expanding so the supercluster moves otward from big bang source, also on large scale all the galaxyclusters are homogeneous and uniform.

3 gravity is the force oppose the dark energy which cause the galaxies to merge.

4 toward sun, according to the observation of voyager2 its axis is tilted 97.7 percent as compared to other planet.

5 sunlike star are found on the main sequence in the G group.

6 Elliptical galaxies are basically galaxies having no spiral arms.

7 it cause supernova which undergo formation of black hole.

8 propertional to photosphere temperature.

9 all of these will work for the observation of black hole.

10 true

11 cepheid star are the standard candles which are used to measure distances.

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