The Big Bang Theory and the Formation of Light Elements

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1. Which cosmological model describes the universe's expansion from a singularity approximately 13.8 billion years ago?
   
   
   
   

• 1. Steady-State Theory

• 1. Big Bang Theory

• 1. Oscillating Universe Theory

• 1. Nebular Hypothesis

1. What process describes the formation of light elements like hydrogen, helium, and lithium during the Big Bang?
   

• 1. Stellar nucleosynthesis
     

• 1. 
     Chemical recombination
     

• Big Bang nucleosynthesis
  

• 1. Alpha decay

1. What is the primary evidence supporting the Big Bang Theory involving galaxies moving away from each other?
   

• 1. Blue shift
     

• 1. Red shift
     

• 1. Cosmic microwave background radiation
     

• 1. Gamma-ray bursts

1. What phenomenon describes the rapid expansion of the universe from a tiny, dense point?
   

• 1. Nuclear fusion
     

• 1. b. Recombination
     

• 1. Inflation
     

• 1. Stellar evolution

1. The term "cosmic microwave background radiation" refers to:
   

• 1. The heat emitted by stars
     

• 1. Energy remnants from the Big Bang
     

• 1. Radio signals from galaxies
     

• 1. Earth's atmospheric radiation

1. Which scientist first observed the redshift of galaxies, providing evidence for an expanding universe?
   

• 1. Edwin Hubble
     

• 1. Albert Einstein
     

• 1. Georges Lemaître
     

• 1. Vesto Slipher

1. During the Big Bang nucleosynthesis, what prevents deuterium from forming initially?
   

• 1. High temperatures
     

• 1. Lack of neutrons
     

• 1. Absence of protons
     

• 1. Strong nuclear forces

1. What percentage of the universe’s ordinary matter is composed of hydrogen by mass, as predicted by the Big Bang?
   

• 1. a. 24%
     

• 1. 50%
     

• 1. 
     74%
     

• 98%

1. Helium-4 has a binding energy of:
   

• 1. 5 MeV
     

• 1. 14 MeV
     

• 1. 28 MeV
     

• 1. 42 MeV