An iron nail is more strongly attracted to the

A) north pole of a magnet.
B) south pole of a magnet.
C) either of these
D) neither of these


Answer: C

Physics & Space Science

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The only place outside of Earth where there is irrefutable evidence for (ancient, microbial) life is

A) the Moon. B) Mars. C) Europa. D) Titan. E) None of the above—there is no irrefutable evidence for life beyond Earth.

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Composite particles that are composed of a quark and antiquark pair are called

A) nucleons. B) leptons. C) baryons. D) hadrons. E) mesons.

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The singularity of a black hole is where general relativity predicts the density to become infinite

Indicate whether the statement is true or false

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When discussing stellar lives, astronomers divide stars by mass into low-mass, intermediate-mass, and high-mass stars. Which category has the longest lifetimes?

A) low-mass stars B) intermediate-mass stars C) high-mass stars

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