Rotation and Revolution - Practice Test 3

Attempt the quiz above first, then review every question with its correct answer and a short explanation below.

1. Q1.The International Date Line (IDL) roughly follows which longitude?

   • A.0°
   • B.90° E
   • C.180°✓ Correct Answer
   • D.90° W

   Explanation: The IDL corresponds approximately to the 180° meridian.

2. Q2.When crossing the International Date Line from East to West (America to Asia), one:

   • A.Gains a day✓ Correct Answer
   • B.Loses a day
   • C.Time remains same
   • D.Loses 12 hours

   Explanation: Crossing Westwards (towards Asia) adds a day (you jump to tomorrow). Wait, logic check: Westward travel = Lose time? No, crossing IDL Westward (Asia side) is 'tomorrow'. You GAIN a calendar date (skip ahead). Technically, you 'lose' the day you skipped, but the date moves forward. Standard phrase: 'Lose a day' when crossing East to West? Actually: East to West -> Add a day. West to East -> Subtract a day.

3. Q3.Tides are highest (Spring Tides) during:

   • A.Full Moon and New Moon✓ Correct Answer
   • B.First Quarter Moon
   • C.Third Quarter Moon
   • D.Every day

   Explanation: Spring Tides occur when Sun, Earth, and Moon are aligned (Syzygy) on Full and New Moons.

4. Q4.The position when the Earth, Sun, and Moon are in a straight line is called:

   • A.Quadrature
   • B.Syzygy✓ Correct Answer
   • C.Perigee
   • D.Apogee

   Explanation: Syzygy is the alignment of three celestial bodies in a straight line.

5. Q5.Neap Tides (lower high tides) occur when the Sun and Moon are at:

   • A.180 degree angle
   • B.90 degree angle (Right angle)✓ Correct Answer
   • C.0 degree angle
   • D.45 degree angle

   Explanation: Neap tides occur during quarter moons when Sun and Moon pull at right angles.

6. Q6.How many high tides usually occur in a day at a place?

   • A.1
   • B.2✓ Correct Answer
   • C.3
   • D.4

   Explanation: Typically, there are 2 high tides and 2 low tides every 24 hours 50 minutes.

7. Q7.The orbital speed of the Earth is maximum at:

   • A.Aphelion
   • B.Perihelion✓ Correct Answer
   • C.Solstice
   • D.Equinox

   Explanation: According to Kepler's Law, Earth moves faster when closest to the Sun (Perihelion).

8. Q8.The orbital speed of Earth is minimum at:

   • A.Aphelion✓ Correct Answer
   • B.Perihelion
   • C.Solstice
   • D.Equinox

   Explanation: Earth moves slowest when it is farthest from the Sun (Aphelion).

9. Q9.What is the average orbital speed of the Earth around the Sun?

   • A.30 km/s✓ Correct Answer
   • B.60 km/s
   • C.100 km/s
   • D.10 km/s

   Explanation: Earth revolves at an average speed of about 29.78 km/s (approx 30 km/s).

10. Q10.The changing altitude of the noon sun is a result of:

    • A.Rotation
    • B.Revolution and Tilt✓ Correct Answer
    • C.Shape of Earth
    • D.Atmosphere

    Explanation: The tilt and revolution cause the Sun to appear higher or lower in the sky through the seasons.

11. Q11.Dawn and Twilight are phenomena caused by:

    • A.Rotation and Atmosphere✓ Correct Answer
    • B.Revolution only
    • C.Moon's gravity
    • D.Tides

    Explanation: Rotation causes sunrise/sunset, while the atmosphere scatters light creating dawn/twilight.

12. Q12.The plane of the Earth's orbit is called:

    • A.Equatorial Plane
    • B.Ecliptic Plane✓ Correct Answer
    • C.Meridian Plane
    • D.Axial Plane

    Explanation: The plane of Earth's orbit around the Sun is the Ecliptic Plane.

13. Q13.Why do we see the same face of the Moon always?

    • A.Moon does not rotate
    • B.Moon rotates and revolves at the same speed✓ Correct Answer
    • C.Moon rotates faster than revolution
    • D.Earth rotates faster

    Explanation: Synchronous rotation: The Moon takes the same time to rotate on its axis as it does to orbit Earth.

14. Q14.Which regions experience 6 months of day and 6 months of night?

    • A.Equator
    • B.Tropics
    • C.Poles✓ Correct Answer
    • D.Temperate Zones

    Explanation: Due to the tilt, Poles experience continuous daylight in summer and darkness in winter.

15. Q15.The exact time taken for one Sidereal Rotation is:

    • A.24 hours
    • B.23 hrs 56 min 4 sec✓ Correct Answer
    • C.23 hrs 50 min
    • D.24 hrs 4 min

    Explanation: Sidereal day is relative to distant stars and is about 4 minutes shorter than a Solar day.

16. Q16.A 'Solar Day' (from noon to noon) is on average:

    • A.24 hours✓ Correct Answer
    • B.23 hrs 56 min
    • C.25 hours
    • D.12 hours

    Explanation: A Solar Day is 24 hours because Earth must rotate a bit more to face the Sun again due to revolution.

17. Q17.The Earth's axis always points towards:

    • A.Sun
    • B.Moon
    • C.Polaris (Pole Star)✓ Correct Answer
    • D.Venus

    Explanation: This phenomenon is called parallelism of the axis; it points to the North Star.

18. Q18.What is the primary cause of the change in seasons?

    • A.Change in distance from Sun
    • B.Tilt of Earth's axis✓ Correct Answer
    • C.Rotation speed
    • D.Ocean tides

    Explanation: While revolution allows it, the TILT is the specific reason different latitudes receive different sunlight.

19. Q19.During the Equinox, the length of day and night at the poles is:

    • A.24 hour day
    • B.24 hour night
    • C.12 hours each (Sunrise/Sunset transition)✓ Correct Answer
    • D.Variable

    Explanation: At the Equinox, the sun grazes the horizon at the poles, marking the transition from 6 months day/night.

20. Q20.Which of the following dates is the Autumnal Equinox in the Southern Hemisphere?

    • A.September 23
    • B.March 21✓ Correct Answer
    • C.June 21
    • D.December 22

    Explanation: March 21 is Spring in North, but Autumn in South.