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Universe and the Earth Test - 4

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Universe and the Earth Test - 4
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  • Question 1
    1 / -0
    Twelve constellations referred to as zodiac are
    Solution
    Ans 2
    Zodiac is an imaginary region that encompass the path of the planets. The zodiac is an area of the sky that extends approximately 8° north or south (as measured in celestial latitude) of the ecliptic, the apparent path of the sun across the celestial sphere over the course of the year.
  • Question 2
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    Which of the following planets is known as the `Morning Star`?
  • Question 3
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    Comets are celestial bodies, moving about the solar system in
    Solution
    Comets go around the Sun in a highly elliptical orbit. This is due to the fact that the planes of revolution of comets are not limited to the plane of the ecliptic in which the planets rotate.
    As the comet comes closer to the Sun, the warming of its surface causes its materials to melt and vapourise, producing the comet's characteristic tail. A comet is an icy, small solar system body that, when passing close to the Sun, warms and begins to release gases through a process called out-gassing. This produces a visible atmosphere or coma, and sometimes also a tail. These phenomena are due to the effects of solar radiation and the solar wind acting upon the nucleus of the comet. Comet nuclei range from a few hundred metres to tens of kilometres across and are composed of loose collections of ice, dust, and small rocky particles.
  • Question 4
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    Which planet of our solar system spins at the fastest rate on its axis?
    Solution
    Jupiter is the fastest spinning planet in our solar system rotating on average once in just under 10 hours.
  • Question 5
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    The term 'meteoroid' is applied to an interplanetary body. Which of the following is correct about a meteor?
    Solution
    Meteoroid is a small particle from a comet or an asteroid orbiting the Sun. The light phenomenon which results when a meteoroid enters the Earth's atmosphere and vaporises is known as meteor.
  • Question 6
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    Among the planets of the solar system, the one which has the longest period of rotation is
    Solution
    Venus has the longest day of any planet in our solar system. It completes one rotation every 243 Earth days. Its day lasts longer than its orbit. It orbits the Sun every 224.65 Earth days, so a day is nearly 20 Earth days longer than its year.
  • Question 7
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    Which one of the following statements regarding shooting stars is incorrect?
    Solution
    Little chunks of rock and debris in space are called meteoroids. They become meteors -- or shooting stars -- when they fall through a planet's atmosphere; leaving a bright trail as they are heated to incandescence by the friction of the atmosphere.
  • Question 8
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    Super Nova is
    Solution
    Correct Answer: a dying star
  • Question 9
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    The same side of the moon always faces the Earth because ________.
    Solution
    The moon orbits the Earth once every 27.322 days. It also takes approximately 27 days for the moon to rotate once on its axis. As a result, the moon does not seem to be spinning but appears to observers from the Earth to be almost perfectly still. This is called tidal locking and it causes synchronous rotation. Hence, the same side of the moon always faces the Earth.
  • Question 10
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    The constellations of stars appear at different positions in the sky at different times during night because
    Solution
    Due to the earth's rotation, stars appear to move. As the Earth rotates from west to east, the stars appear to rise in the East, moving across south to set in the west.
  • Question 11
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    'Parsec' is the unit of measurement of
    Solution
    Ans 2. The parsec (symbol: pc) is a unit of length used to measure large distances to astronomical objects outside the Solar System. A parsec is defined as the distance at which one astronomical unit subtends an angle of one arcsecond, which corresponds to 648000π astronomical units.
  • Question 12
    1 / -0
    The time required by moonlight to reach the earth is
    Solution
    Ans 2. Light travels through space at just over 1,86,000 miles per second. The Moon is just under 2,50,000 miles from Earth, so light from the Moon's surface has to travel more than one second (about 1.3 seconds) to reach us.
  • Question 13
    1 / -0
    The brightest star in the sky is
    Solution
    Ans 3
    The brightest star in the sky is Sirius, also known as the Dog Star or, more officially, Alpha Canis Majoris, for its position in the constellation Canis Major. Sirius is a binary star dominated by a luminous main sequence star.
  • Question 14
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    Lunar eclipse is caused when
    Solution
    Lunar eclipse is caused when Earth comes between Sun and Moon. This causes the shadow of Earth to fall on Moon, either partially or completely, making it go dark for sometime.
  • Question 15
    1 / -0
    Solar eclipse occurs when _______.
    Solution
    A solar eclipse occurs when the moon gets between Earth and the sun, and the moon casts a shadow over Earth. A solar eclipse can only take place at the phase of new moon, when the moon passes directly between the sun and Earth and its shadows fall upon Earth's surface.
  • Question 16
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    Tides are caused by the gravitational pull of _______ .
    Solution
    Tides are caused by the gravitational pull of moon on earth.
    On a full moon gravitational pull is the maximum.
  • Question 17
    1 / -0
    Halley`s comet appears once in a period of
  • Question 18
    1 / -0
    The hottest planet in our solar system is
    Solution
    Ans 2
    Venus, which is the second planet from the sun, has a temperature that is maintained at 462 degrees Celsius. It is the hottest planet in our solar system. Mercury, which is nearest to the sun, has no atmosphere, due to which all the solar radiation escapes into the space. However, Venus has an atmosphere which is primarily composed of carbon dioxide, a greenhouse gas; due to this, solar radiation could not escape from its atmosphere and makes it even more hotter.
  • Question 19
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    Pole star is always seen at one point in the sky, whereas other stars are not. This is because __________.
  • Question 20
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    The solar eclipse achieves totality only in limited geographical regions because _______ .
    Solution
    The solar eclipse achieves totality only in limited geographical regions because size of the shadow of moon on earth is small as compared to cross-section of earth.
  • Question 21
    1 / -0
    The inclination of the earth`s axis to the orbital plane is
    Solution
    Earth's axis is tilted by 23.5° around it axis of rotation. So from the plane, angle of inclination = 90° - 23.5 °= 66.5 °
  • Question 22
    1 / -0
    The mean radius of the earth is approximately
    Solution
    The mean radius of Earth is 6,371 km. Therefore, the nearest correct answer is 6400 km.
  • Question 23
    1 / -0
    Which of the following is the cause for Earth's seasons?
  • Question 24
    1 / -0
    Equinox occurs when the Sun is vertically above the
    Solution
    An equinox is the moment at which the centre of the visible Sun is directly above the Equator.
  • Question 25
    1 / -0
    Which of the following is the best definition of tides?
  • Question 26
    1 / -0
    Greenhouse effect means
    Solution
    Greenhouse effect is trapping of solar energy due to atmospheric carbon dioxide or other greenhouse gasses like methane.
    Therefore, option 3 is correct.
  • Question 27
    1 / -0
    The polar diameter of Earth is shorter than equatorial diameter by about
    Solution
    The latest measurements indicate that the Earth has an equatorial diameter of 12,756 km (7926 mi), and a polar diameter of 12713.6 km (7899.86 mi). Hence. the difference between the both approx is 43 km.
  • Question 28
    1 / -0
    Japan is called the 'Land of the Rising Sun' because
    Solution
    Ans 3
    Japan, being the easternmost country in the world, has the earliest sunrise.
    The name comes from the Chinese perspective who saw the Sun rise over Japan and named Japan that way. Even though today we know that the day begins first in New Zealand, even before Japan, the nomenclature of Land of Rising Sun continues to be used for Japan.
  • Question 29
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    Which of the following is not an effect produced by rotation of Earth?
  • Question 30
    1 / -0
    Prime meridian is also called
    Solution
    Prime meridian is also known as the Greenwich Meridian. In a geographical coordinate system, the Greenwich Meridian (or prime meridian) is the 0° line of longitude from which we measure 180° to the west and 180° to the east.
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