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Motions of the Earth Test - 3

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Motions of the Earth Test - 3
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  • Question 1
    1 / -0
    The fixed path along which the earth revolves is round the sun is called ___________.
    Solution
    • The celestial sphere is the imaginary sphere drawn by taking radius concentric to the radius of the Earth, on which all the objects of the sky are placed.
    • The elliptic path is the path that is followed by all the planets during the revolution around the Sun.
    • The plane of Earth's orbit around the Sun is known as the ecliptic plane.
    • The fixed path along which the Earth revolves is round the Sun is called Earth's orbit.

  • Question 2
    1 / -0
    Tick the correct answer.
    Direct rays of the sun fall on the equator on
    Solution
    On 21st March and September 23rd, direct rays of the sun fall on the equator. At this position, neither of the poles is tilted towards the sun; so, the whole earth experiences equal days and equal nights. This is called an equinox.
  • Question 3
    1 / -0
    During rotation of the earth, the parts of the earth which face the sun have ________.
    Solution
    • On Earth, daytime is roughly the period on any given point of the planet's surface during which it experiences natural illumination from indirect or (especially) direct sunlight.
    • Their tilt toward the sun leads to over half of the day being in daylight and warmer temperatures due to the increased directness of the sun's rays, the longer day period itself and less absorption of sunlight in the atmosphere. 
    • The period of the daytime from the standpoint of a surface observer is roughly defined as the period between sunrise, when the Earth's rotation towards the east first causes the Sun's disc to appear above the horizon, to sunset, when the continuing rotation of the Earth causes the Sun's disc to disappear below the horizon to the west.
  • Question 4
    1 / -0
    Equinox occurs on ___________.
  • Question 5
    1 / -0
    Tick the correct answer.
    The movement of the earth around the sun is known as
    Solution
    Revolution
  • Question 6
    1 / -0
    Which of the followings is the shortest day in the southern hemisphere?
    Solution
    On 21 June sun rays fall vertically over the Tropic of Cancer. This position of the Earth is called Summer Solstice. On this day, It is considered the longest daylight time in Northern Hemisphere but in Southern Hemisphere, it is considered as the shortest daylight time.
  • Question 7
    1 / -0
    The summer solstice in northern hemisphere occurs when the sun is directly overhead at noon on _________________.
    Solution
    The summer solstice in the northern hemisphere occurs when the Sun is directly overhead at noon on the Tropic of Cancer. The summer solstice happens on 21 June. This day has the longest daylight time.
  • Question 8
    1 / -0
    Direction, inclination of axis and speed are the characteristic of the _____________.
    Solution
    • In astronomy, axial tilt, also known as obliquity, is the angle between an object's rotational axis and its orbital axis, or, equivalently, the angle between its equatorial plane and orbital plane.
    • It differs from orbital inclination. 
    • At an obliquity of zero, the two axes point in the same direction; i.e., the rotational axis is perpendicular to the orbital plane. 
    • Earth's axis remains tilted in the same direction with reference to the background stars throughout a year .
    • Like Earth, all of the rocky planets have a small precessional rotation of their spin axis.
    • A rotation is a circular movement of an object around a center (or point) of rotation .
    •  A three-dimensional object always rotates around an imaginary line called a rotation axis.
    •  If the axis passes through the body's center of mass, the body is said to rotate upon itself, or spin.
    • The speed of rotation is given by the angular frequency  (rad/s) or frequency  ( turn/s, turns per minute), or period (seconds, days, etc.).
  • Question 9
    1 / -0
    The speed of earth's rotation at the equator is ______________ km per hour.
    Solution
    • Speed of the Earth's Rotation at the Equator:
    • Circumference of the Earth at the Equator = 40,000 kilometers
    • Time to complete one Rotation = 24 hours
    • Speed of Rotation = Distance/Time = 40,000 km / 24 hr = 1670 km/hr.

  • Question 10
    1 / -0
    The speed of earth's rotation decreases towards the ___________.
    Solution
    • The Earth as a whole rotates 360 degrees once every 24 hours.
    •  This rotation is responsible for the appearance of the sun “rising” in the East and “setting” in the West. 
    • The surface speed of the Earth’s rotation at the top -- technically known as the geographic North Pole -- is slower than that of the vast majority of other places on the planet but equal to that of one other terrestrial location.
    •  The Earth rotates fastest at the equator, and slowest -- essentially, not at all -- at the top and bottom, with the rotation speed at the middle latitudes falling somewhere in between these two extremes. 
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