This is a huge luminous ball of hot gas such as Hydrogen and Helium.

• a. comet

• b. moon

• c. planet

• d. star

2. Which elements fuse together to form Iron?

• a. carbon fusion c. magnesium fusion b. neon fusion d. silicon fusion

• b. neon fusion

• c. magnesium fusion

• d. silicon fusion

When does a star become unstable?

• a. When it runs out of fuel

• b. When it contracts and expands

• c. When its core is converted to Iron

• d. When the outer shell of star is pulled by the gravity from the center

Which of the following is NOT an evidence of star formation?

• a. hydrogen

• b. helium

• c. infrared Radiation

• d. rocks

Star’s energy is produced by which process?

• a. combustion

• b. decomposition

• c. nuclear fission

• d. nuclear fusion

If the sun reaches the end of red giant phase, it will evolve into a _______.

• a. black hole

• a. b. supernova

• c. red super giant

• d. white dwarf

A category which includes the largest stars in the universe. a. main sequence star c. red super giant b. red giant d. white dwarf

• a. main sequence star

• b. red giant

• c. red super giant

• d. white dwarf

5. Which of the following elements are major components of star? a. carbon and oxygen c. hydrogen and carbon b. helium and carbon d. hydrogen and helium

• a. carbon and oxygen

• b. helium and carbon

• c. hydrogen and carbon

• d. hydrogen and helium

Which of the following statements is FALSE?

• a. The core of red giant star is made up of carbon

• b. The average star has shorter life span

• c. The more massive the star is the faster it burns its fuel

• d. No elements heavier than Iron can be produced in a massive star

Which is the first stage of a star’s life cycle?

• a. black hole

• b. nebula

• c. protostar

• d. white dwarf