Quiz on Spectral Classification of Stars

The average surface temperature of M-class stars is (a)   degrees Kelvin.

• More than 28,000 degrees Kelvin
• 10,000 to 20,000 degrees Kelvin
• Fewer than 3,500 degrees Kelvin
• 5,000 to 6,000 degrees Kelvin

How are stars grouped in the spectral classification system?

• By their distance from Earth

• By their size and mass

• By their temperature, color, and luminosity

• By their age and composition

What is the main reason our sun looks bigger than other stars?

• It is the largest star

• It is the hottest star

• It is much closer to Earth

• It is the brightest star

Which class of stars is described as being relatively young and rare in the universe?

• O-class stars

• B-class stars

• F-class stars

• G-class stars

What percentage of stars are M-class stars?

• 25%

• 50%

• 75%

• 90%

What is the surface temperature of M-class stars?

• Less than 3,000 degrees Kelvin

• Less than 5,000 degrees Kelvin

• Less than 7,000 degrees Kelvin

• Less than 9,000 degrees Kelvin

What is the first stage of a star's life cycle?

• Neutron star

• Main-sequence star

• Protostar

• Brown dwarf

What causes main-sequence stars to have long life cycles?

• High temperature

• Balance between gravitational force and gas pressure

• Rapid nuclear fusion

• Large size

Match the following stages of a star's life cycle with their characteristics.

• Stage where the star expands and cools after exhausting hydrogen in its core.

• Main Sequence

• Stage characterized by strong stellar winds and variability.

• T Tauri

• Stage where a star forms from a collapsing cloud of gas and dust.

• Protostar

• Stage where the star stabilizes to create an equilibrium between gravitational force and pressure from gas.

• Red Giant

Tags

NGSS.HS-ESS1-3

Match the following stages of a star with their characteristics.

• White Dwarf stage

• It begins nuclear fusion

• Red Giant stage

• It stabilizes gravitational forces

• Main Sequence stage

• It burns up all reserves of energy

• Neutron Star stage

• It forms a dense core of neutrons

Tags

NGSS.HS-ESS1-3