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Physical Science Preliminary Exam Review Quiz

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Questions and Answers

Which subatomic particle is different in isotopes of an element?

Photons
Protons
Neutrons (correct)
Alpha particle

According to which law is the red shift directly proportional to the distance and speed of a star moving away from the observer?

Kepler's Law
Newton's Law
Charles's Law
Hubble's Law (correct)

What event explained the origin of the universe as a singularity that exploded into a cloud of gas?

Supernova Explosion
Big Crunch
Stellar Formation and Evolution
Big Bang (correct)

What was the composition of the universe after a few minutes of the Big Bang?

<p>75% hydrogen, 25% helium, trace amounts of lithium (A)</p> Signup and view all the answers

Which one of the following statements is NOT true about nuclear reactions?

<p>Nuclear reactions are not influenced by subatomic particles (C)</p> Signup and view all the answers

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Study Notes

Elements and Isotopes

An element with the same number of protons but different number of neutrons is described as an isotope.

Astronomy Laws

Hubble's Law states that the size of the red shift is directly proportional to the distance and speed of a star moving away from the observer on Earth.

Origins of the Universe

The Big Bang theory explains the origin of the universe from a singularity that exploded into a cloud of gas.

Composition of the Universe

After a few minutes of the Big Bang, the universe was composed of 75% hydrogen, 25% helium, and trace amounts of lithium.

Nuclear Reactions

Nuclear reactions do not involve the emission of radioactive particles of an atom.

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