Question 1 1. If you are standing at Earth’s equator at noon, which of the follo
ID: 230339 • Letter: Q
Question
Question 1
1. If you are standing at Earth’s equator at noon, which of the following will be directly overhead?
a.
The polar star.
b.
The South Pole.
c.
The Sun.
d.
The north celestial pole.
e.
None of the above.
5 points
Question 2
1. If you are standing at the Earth’s equator, which of the following will be directly overhead?
a.
The polar star.
b.
The celestial equator.
c.
The South Pole.
d.
The north celestial pole.
e.
None of the above.
5 points
Question 3
1. Approximately how many times is the Sun’s orbital period around the galaxy’s center greater than Earth’s orbital period around the Sun?
a.
1,000 times.
b.
220 times.
c.
10 times.
d.
200,000,000 times.
5 points
Question 4
1. You ______ from Sydney, Australia _____.
a.
will be able to see the Big Dipper; because the Big Dipper is far away from us.
b.
will not be able to see the Big Dipper; because the Big Dipper is located relatively close to the North Pole.
c.
will be able to see the Big Dipper in the summer time; but not in the winter time because of Earth’s tilt.
d.
None of the above.
5 points
Question 5
1. Prograde and retrograde motions of planets, as viewed from Earth, are caused by:
a.
a combination of their orbital motions around Earth and Earth's orbital motion.
b.
a combination of their orbital motions and the motions around their axes around the Sun.
c.
a combination of their orbital motions around the Sun and Earth's own orbital motion.
d.
None of above.
5 points
Question 6
1. The precession of Earth’s axis is caused by:
a.
the gravitational forces exerted by the Sun on Earth’s equator.
b.
a joint action due to the gravitational forces exerted by the Sun and the Moon on the spinning top, causing the axis to slowly revolve around the vertical, while the tilt remains close to 23.5 deg.
c.
the gravitational forces exerted by the Sun and Jupiter on the spinning top, causing the axis to slowly revolve around the vertical while the tilt remains close to 23.5 deg.
d.
the gravitational forces exerted by the Moon on the spinning top, causing the axis to slowly revolve around the vertical while the tilt remains close to 23.5 degrees.
5 points
Question 7
1. Why do stars observed at the North Pole never rise or set?
a.
Because of the Sun's revolution around Earth, all stars visible at the North Pole revolve around Polaris that appears directly overhead.
b.
Because of Earth's rotation about its axis, all stars visible at the North Pole revolve around Polaris that appears directly overhead.
c.
Some of them do, but we never observe them.
d.
None of the above.
5 points
Question 8
1. To measure Earth's size Eratosthenes assumed that:
a.
Earth is a sphere.
b.
the Sun is far away from Earth.
c.
Syene and Alexandria lie on the same meridian.
d.
All of the above.
e.
None of the above.
5 points
Question 9
1. Which of the following is the correct order?
a.
Protons, quarks, atom, molecule.
b.
Atom, molecule, quark, proton.
c.
Quark, proton, atom, molecule.
d.
None of the above.
5 points
Question 10
1. 1 AU is:
a.
A distance light travels in a year.
b.
A unit of mass of an average black hole.
c.
An average distance between Earth and the Sun.
d.
An average distance between the Sun and the closest star.
5 points
Question 11
1. About how much larger is the Sun in size than Earth?
a.
10.
b.
100.
c.
10000.
d.
1000000.
e.
None of the above.
5 points
Question 12
1. Diurnal changes on Earth are caused by:
a.
the revolution of Earth around the Sun with the orbital period of 1 year.
b.
the Sun's revolution around Earth.
c.
Earth's rotation around its axis with the period of 23h 56m 4s.
d.
a combination of Earth's revolution around the Sun and its axis tilt with respect to ecliptic.
e.
None of the above.
5 points
Question 13
1. A total lunar eclipse takes place only during:
a.
the vernal equinox.
b.
a Full Moon, when the Moon is located behind the Sun and Earth.
c.
a New Moon, when the Moon is directly between the Sun and Earth and faces us with its “unlit” side.
d.
the Moon's first quarter.
e.
All of the above.
5 points
Question 14
1. Nanometer is a unit of:
a.
1/1000 m.
b.
1/10 m.
c.
100,000,000 m.
d.
10-9 m.
5 points
Question 15
1. The major difference between the duration of the sidereal and synodic month is caused by:
a.
the gravitational pull from the galaxy's center.
b.
the Sun's motion around the center of the galaxy.
c.
our inaccuracies in measuring the position of the Sun with respect to the fixed stars.
d.
the effect of the change in direction of Earth’s axis, or precession.
e.
the combined motion of Earth’s around the Sun and the Moon's revolution around Earth.
5 points
Question 16
1. The New Moon is observed when:
a.
the Moon is positioned between Earth and the Sun.
b.
Earth is positioned between the Moon and the Sun.
c.
the Sun is positioned between Earth and the Moon.
d.
all planets aligned with Earth and Sun.
5 points
Question 17
1. A total solar eclipse takes place only during:
a.
the vernal equinox.
b.
a Full Moon, when Earth is directly between the Sun and the Moon.
c.
a New Moon, when the Moon is directly between the Sun and Earth and faces us with its “unlit” side.
d.
the Moon's first quarter.
e.
All of the above.
5 points
Question 18
1. Why do the Sun, the Moon and stars appear to move from east to west across the sky?
a.
The apparent motion of the Sun, the Moon and stars is caused by Earth's rotation around its axis from east to west.
b.
The apparent motion of the Sun, the Moon, and stars is caused by Earth's rotation around its axis from west to east.
c.
The Sun, the Moon and stars always move from east to west.
d.
None of the above.
5 points
Question 19
1. The plane of the ecliptic is tilted with respect to the celestial equator at 23.5 degrees. This reflects the fact that:
a.
the Sun moves from east to west as it orbits Earth.
b.
the Sun moves from east to west as Earth orbits the Sun.
c.
Earth's axis is tilted by the same angle with respect to the orbital plane.
d.
None of the above.
5 points
Question 20
1. The difference between the Moon's sidereal and synodic period is attributed to:
a.
Earth’s rotations around its axis and the Moon's revolution around Earth.
b.
Earth’s revolution around the Sun and the Moon's revolution around Earth.
c.
the Moon's revolution around Earth.
d.
the Moon's tidal effects on Earth.
e.
None of the above.
5 points
Save and Submit
a.
The polar star.
b.
The South Pole.
c.
The Sun.
d.
The north celestial pole.
e.
None of the above.
Explanation / Answer
1-c
2-e
3-d
4-c
5-c
6-b
7-b
8-d
9-c
10-d
11-b
12-d
13-b
14-d
15-e
16-b
17-c
18-b
19-c
20-b
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