Stars and Classification Quiz

Which nuclear reaction is the burning process inside of a star?

• Fission of helium

• fusion of hydrogen

• burning of coal

• combustion of helium

Which of the following forces causes the star to pull in on itself?

• fission

• fusion

• half-life

• gravity

Where inside of the Sun does nuclear fusion take place?

• inside the corona

• inside the convective zone

• inside the photosphere

• inside the core

A sunspot appears darker on the surface of the sun because

• sunspots have a different chemical composition compared to the rest of the sun.

• sunspots are dark clouds that hover over the surface of the sun.

• sunspots do not emit light.

• sunspots are cooler regions compared to the rest of the surface of the sun.

When stars are placed into a spectral classification (OBAFGKM), they are grouped by their

• temperatures

• spectral lines

• velocities

• luminosities

Which of the following measurements is a measure of how bright a star appears in the sky at night?

• absolute magnitude

• apparent magnitude

• parallax

• distance modulus

The absolute magnitude of a star is a measure of

• how bright a star appears

• how much light a star is giving off

• the parallax of a star

• the distance to a star

Parallax is a measure of

• the eccentricity of an ellipse of a star

• the actual luminosity of a star

• the apparent brightness of a star in comparison to other stars

• the apparent shift of a star against the background of other stars

The mass-luminosity relationship that is shown in the main sequence of the H-R diagram is

• As mass increases, luminosity increases.

• As mass increases, luminosity decreases.

• As mass decreases, luminosity increases.

• As mass increases, luminosity remains constant.

The location of blue giants