summative physical science

Which of the following describes stellar nucleosynthesis?

• It is the process by which elements are formed within stars

• It is the formation of elements during a supernova explosion.

• It is the process by which elements are produced in gas clouds.

• It is the formation of light elements such as hydrogen and helium

Which of the following is a stellar core formed when the fragments of a collapsed molecular cloud contract?

• Main Sequence Star

• Red Giant   

• Supernova

• Protostar

The formation of a star starts with the dense regions of molecular clouds. What force pulls matter together to form these regions?

• Nuclear Force

• Magnetic Force

• Gravitational Force

• Electromagnetic Force

Which is not a product of primordial nucleosynthesis?

• Carbon -12

• Helium -4

• Hydrogen -2

• Lithium -7

A reaction in which two or more nuclei combine to form heavier nuclei.

• combustion

• nuclear fission

• nuclear Fusion

• nuclear synthesis

Which of the following is not considered as light elements?

• Helium

• Lithium

• Hydrogen

• Iron

Which of the following is the most accepted theory about the formation of the universe that explains why it continues to expand?

• oscillating theory

• divine creation theory  

• big bang theory

• steady state theory

Which process is responsible for the formation of light elements such as Hydrogen and Helium?

• big bang nucleosynthesis

• stellar nucleosynthesis  

• terrestrial nucleosynthesis

• supernova nucleosynthesis.

Which element is the lightest and at the same time the most abundant in outer space?

• helium     

• lithium

• iron

• hydrogen

How do heavier elements formed?

• Through nuclear fission       

• Through combustion

• Through nuclear synthesis

• Through nuclear fusion