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PHYS 284 1-6 Midterm Exam Questions and Answers 2024/2025 with complete solutions;Concordia University
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PHYS 284 1-6 Midterm Exam Questions and Answers 2024/2025 with complete solutions;Concordia University

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PHYS 284 1-6 FINAL Exam Questions and
Answers 2024/2025 with complete
solutions;Concordia University


An astronomical unit (AU) is

A) the age of the universe.

B) any planet's average distance from the sun.

C) Earth's average distance from the sun.

D) the average distance between galaxies. - ANSWER-C) Earth's
average distance from the sun.

Could we see a galaxy 16 billion light years away?

A) Yes, if our telescope is powerful enough.

B) No, because galaxies cannot exist at that distance.

C) Yes, but only with an instrument that can measure extremely long
wavelengths due to the extremely high redshift.

D) No, because it would be beyond the bounds of our observable part of
the universe. - ANSWER-D) No, because it would be beyond the bounds
of our observable part of the universe.

When we look farther away in distance,

A) we look further back in time.

,B) we see that there are fewer galaxies far away.

C) we see a larger portion of the current universe.

D) we look further into the future. - ANSWER-A) we look further back
in time.

Our distance from the sun is about

A) 150,000 km.

B) 1,500,000 km.

C) 150,000,000 km.

D) 1 light year. - ANSWER-C) 150,000,000 km.

The Andromeda galaxy is

A) moving away from us.

B) moving towards us.

C) circling us at constant distance.

D) stationary relative to us. - ANSWER-B) moving towards us.

Stonehenge is connected to astronomical events, because

A) it marks the seasons by marking the directions to sunrise and sunset
at summer and winter solstice.

B) the Heel Stone marks the direction to Polaris (the North Star).

C) at spring equinox the sun would rise above the Heel Stone.

,D) every full moon would rise above the Heel Stone. - ANSWER-A) it
marks the seasons by marking the directions to sunrise and sunset at
summer and winter solstice.

Ptolemy explained

A) retrograde motion in a sun centered model of the solar system.

B) retrograde motion of planets through periodic oscillations in Earth's
orbital speed.

C) retrograde motion in a geocentric model through planets moving on
epicycles (small circles upon large circles).

D) that planets are moving on ellipses. - ANSWER-C) retrograde motion
in a geocentric model through planets moving on epicycles (small circles
upon large circles).

Erathostenes measured

A) the circumference of an Earth which he assumed to be a flat disc.

B) the circumference of Earth from Earth's shadow on the moon during
partial lunar eclipses.

C) the circumference of Earth from the shadow that a tower casts on a
specific day.

D) the distance between Earth and the moon. - ANSWER-C) the
circumference of Earth from the shadow that a tower casts on a specific
day.

Tycho Brahe's most important contribution to science was

, A) his extremely careful observations of planetary orbits.

B) his discovery that the Ptolemaic model is correct.

C) his discovery that the Sun orbits Earth while all the other planets orbit
the Sun.

D) his invention of the telescope. - ANSWER-A) his extremely careful
observations of planetary orbits.

The phases of venus as a confirmation of the heliocentric model were
discovered by

A) Tycho

B) Galileo

C) Copernicus

D) Kepler - ANSWER-B) Galileo

Mercury's orbit around the Sun is

A) a circle with the Sun in the center.

B) an ellipse with the Sun in the center.

C) an ellipse with the Sun in a focal point.

D) a parabola. - ANSWER-C) an ellipse with the Sun in a focal point.

Which statement is NOT correct? An accepted scientific theory must

A) not contradict experimental observations.

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