Life Cycle of Stars Pop Quiz

What is the temperature at the center of a protostar when it reaches several million degrees?

• One million degrees

• Ten million degrees

• One hundred million degrees

• One billion degrees

Answer explanation

The temperature at the center of a protostar when it reaches several million degrees is ten million degrees, which is the correct choice.

What is the primary process that occurs inside a star for the bulk of its life?

• Nuclear fission

• Gravitational collapse

• Nuclear fusion

• Chemical reactions

Answer explanation

The primary process that occurs inside a star for the bulk of its life is nuclear fusion, where hydrogen atoms combine to form helium, releasing energy in the process.

What is the first stage of the fusion process inside a star?

• Formation of helium

• Conversion of protons into neutrons

• Release of energy

• Creation of positrons

Answer explanation

The first stage of the fusion process inside a star is the conversion of protons into neutrons, leading to the formation of helium.

What state of matter is achieved when the gas in a protostar gets so hot that electrons escape from the atoms?

• Gas

• Liquid

• Solid

• Plasma

Answer explanation

When the gas in a protostar gets so hot that electrons escape from the atoms, it forms the state of matter known as plasma.

What is the process that occurs when a star pumps out energy in the form of heat and light?

• Chemical reactions

• Electromagnetic radiation

• Gravitational collapse

• Nuclear fusion

Answer explanation

Nuclear fusion is the process that occurs when a star pumps out energy in the form of heat and light, not chemical reactions, electromagnetic radiation, or gravitational collapse.

What is the formula for converting mass into energy according to Einstein's theory?

• E=mc

• E=mc^2

• E=mc^3

• E=mc^4

Answer explanation

According to Einstein's theory, the formula for converting mass into energy is E=mc^2.

What is the process that takes place inside a star where hydrogen is converted into helium?

• Reaction

• Fission

• Fusion

• Combustion

Answer explanation

The process that takes place inside a star where hydrogen is converted into helium is called Fusion.

What is the lightest element of all?

• Oxygen

• Carbon

• Helium

• Hydrogen

Answer explanation

Hydrogen is the lightest element with an atomic number of 1 and a very low atomic mass.

What is the term used to describe a big ball of protons at the center of a protostar?

• Neutron star

• Plasma ball

• Proton sphere

• Protostar core

Answer explanation

The term used to describe a big ball of protons at the center of a protostar is a Plasma ball.

What is the term used to describe a loose grouping of hydrogen atoms?

• Nebula

• Protostar

• Black Hole

• Supernova

Answer explanation

The term used to describe a loose grouping of hydrogen atoms is Protostar.