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Stars and the Solar System Test - 30

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Stars and the Solar System Test - 30
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  • Question 1
    1 / -0
    Astronomers use constellations to 
    Solution
    Constellation, in astronomy, is any of certain groupings of stars that were imagined to form conspicuous configurations of objects or creatures in the sky. Constellations are useful in assisting astronomers and navigators to locate certain stars.Other objects in sky are located with reference to these constellations.
  • Question 2
    1 / -0
    Which unit is usually used to describe the distances of stars?
    Solution
    Light year is the distance travelled by light in one year. Light year is usually used to describe the distances of stars.
  • Question 3
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    Choose correct option to fill the blank.
    The phase of the moon in which the whole disc of the moon is visible is known as the _________phase.
    Solution
    A full Moon occurs when the Moon has moved in its orbit so that Earth is “between” the Moon and the Sun. In full moon phase , the whole disc of the moon is visible.Hence it is called full moon phase.
  • Question 4
    1 / -0
    State true or false.
    The four inner most planets of solar system are made of rocks and have metallic cores.
    Solution
    There are four rocky, or terrestrial, planets: Mercury, Venus, Earth, and Mars.These are also the four inner most planets of solar system. These planets are called terrestrial planets because they are made up of rocks and metals and have solid surfaces.Their cores are mostly made of metals.
  • Question 5
    1 / -0
    Phases of the moon occur because
    Solution

    Since we know that moon does not have it's own light but it reflects light coming from sun.So as the Moon orbits around the Earth, the part of the Moon that faces the Sun will be lit up. So we can only see that part of moon which is lit up by sun.Shape of lit part depends on relative location of sun,earth and moon.Thus the different shapes of the lit portion of the Moon that can be seen from Earth are known as phases of the Moon.
  • Question 6
    1 / -0
    On which planet would you see the sun rise in the west and set in the east?
    Solution
    If viewed from above, Venus rotates on its axis from east to west that's the opposite of most planets'. That means on Venus, the sun would appear to rise in the west and set in the east. On Earth, the sun appears to rise in the east and set in the west.Because earth rotates from west to east.
  • Question 7
    1 / -0
    What is the value of one light year?
    Solution
    We know speed of light is $$300000km/s$$
    And One year=$$365\times 24\times 60\times 60 =31536000s$$
    And one light year is defined as distance travelled by light in one year.
    So One Light year=$$300000km/s\times 31536000=9.46 \times 10^{12}km$$
  • Question 8
    1 / -0
    Which of the following is not a member of the solar system? 
    Solution
    The Sun and the celestial bodies which revolve around it form the solar system. It consists of a large number of bodies such as planets, comets, satellites, asteroids, and meteors.
    Constellations are groups of stars that appear to form recognizable shapes.
    A constellation is not a member of the solar system.
  • Question 9
    1 / -0
    The bright head of the comet is known as
    Solution
    Comets are  snowballs of frozen gases, rock, and dust that orbit the Sun. When frozen, they are the size of a small town. 

    Astronomers have identified three main parts of a comet: the nucleus, coma and tail.
    The bright head of the comet is known as Coma.
    The center of a comet's head is called its nucleus. 
    The tail consists of gas and dust that can extend hundreds of millions of kilometers away from the coma. 

  • Question 10
    1 / -0
    What do all four gas giants have that terrestrial planets do not have?
    Solution
    The terrestrial planets are the planets which are closer to the Sun. These planets includes the Mercury, Venus, Earth and Mars. These planets are made of rock and metals.The gas giant planets are those which are the farthest from the Sun. They are the outer planets of our solar system and includes Saturn, Jupiter, Uranus and Neptune. These planets are composed of gases and have little hard rocky material at their core. However, these planets have rings around them which is mostly composed of gases, moons etc, but the terrestrial planets do not have such rings around them.
    So correct answer is option D (Rings).
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