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Solar System Important Questions for SSC and UPSC

Solar system important questions for SSC and UPSC

Solar system important questions for SSC and UPSC

THE SUN

•The  Sun is the largest object within our solar system.

•The Sun is a hot ball of glowing gases at the heart of our solar system.

•It is a ball of gas held together by its gravity.

•It is a main sequence yellow dwarf star.

•Average diameter: approx. 864,000 miles

•The  Sun is about  109  times the size of the  Earth.

•Distance from Earth: about 149.60 million kilometers.

•The Sun comprises hydrogen  (70%) and Helium (28%).

•The energy created by the Sun’s  core is nuclear fusion

•ISRO categorizes Aditya L1 as a  400 kg-class satellite, that will be  launched using the Polar Satellite  Launch Vehicle (PSLV) in XL  configuration

•NASA LAUNCHED ‘PARKER SOLAR  PROBE’.

Top 10 questions about solar system with answers pdf

Solar system important questions for SSC and UPSC

STRUCTURE OF THE SUN

1. . The Sun has six regions.

2. A Radiative zone surrounding the core,

3. A Convective zone surrounding the  radiative zone,

4. A thin Photosphere at its surface

5. A Chromosphere and

6. Corona that extends beyond the photospheric surface.

      • •At the core, the temperature is about 27 million degrees Fahrenheit (15  million degrees Celsius), which is sufficient to sustain thermonuclear fusion.

      • •Energy produced in the core slowly rises in the radiative zone outside the core.

      • •The transport of energy from the Sun’s core (where it is produced) to the regions that surround it can be done by transferring it by radiation. This is how it travels from the center of the Sun to the outer regions, hence the name “radiative zone”.

      • •The photosphere is the bright outer layer of the Sun that emits most of the radiation.

      • •Chromosphere is a relatively thin layer of burning gases.

      • •Corona is a thick layer of gas above the chromosphere. It extends millions of kilometers around the sun. Sun’s Corona visible during Total Solar Eclipse.

    Top 10 questions about solar system with answers pdf

    PLANETS ACCORDING TO THEIR SIZE  (DECREASING ORDER

    •1. Jupiter

    •2. Saturn

    •3. Uranus

    •4. Neptune

    •5. Earth

    •6. Venus

    •7. Mars

    •8. Mercury

    SUNSPOT

    •A dark patch on the surface of the Sun is  known as a sunspot.

    •Sunspots are areas of the Sun’s surface that  appear darker than the surrounding areas,  this is because they are cooler. They form in  areas of strong magnetic activity that inhibit  heat transfer.

    •Sunspots are 500-1500°C cooler than the  surrounding chromosphere. That is the  reason that they apprear as dark areas.

    •Each spot has a black centre or umbra, and a  lighter region or penumbra, surrounding it.

    SOLAR WIND

    •The earth’s magnetosphere acts as a shield against the ever growing solar wind and deflect  it away from the Earth.

    •Particles of solar winds sometimes pierce the  magnetic shield and enter the upper  atmosphere. This causes Auroral displays.

    •In Arctic region they are called Aurora Borealis  and in Antarctic region there known as Aurora  Australis.

    Top 10 questions about solar system with answers pdf

    Solar system important questions for SSC and UPSC

    CONDITIONS TO BE A PLANET

        • The most recent definition of a planet was adopted by the  International Astronomical Union in 2006. It says a planet must do  three things:

        • It must orbit a star (like the Sun).

        • It must be big enough to have enough gravity to force it into a  spherical (or nearly spherical) shape.

        • It must be big enough that its gravity cleared away any other objects of similar size near its orbit around the Sun.

      INTERNATIONAL ASTRONOMICAL UNION (IAU)

      Established : in 1919

      Headquarters : Paris, France

      Role: to promote and safeguard  the science of astronomy through international cooperation, assign official names and designations to celestial bodies.

      PLANETS OF THE SUN

      The 8 planets of the Sun are :

      1. Mercury,

      2. Venus,

      3. Earth,

      4. Mars,

      5. Jupiter,

      6. Saturn,

      7. Uranus and

      8. Neptune.

      Solar system questions and answers pdf

      DWARF PLANETS

      •In  2006,  a  new  and  distinct  class  of  celestial  objects  was  named  by  the International  Astronomical

      Union  (IAU). They were called “dwarf planet”.

      •Pluto,  Ceres,  Makemake,  Haumea,  Eris- these are dwarf planets.

      •Ceres is located inside the asteroid belt between the orbits of Mars and Jupiter.

      •The other dwarf planets are located in the outer solar system.

      Solar system questions and answers pdf

      Solar system important questions for SSC and UPSC

      TERRESTRIAL AND JOVIAN PLANETS

      •The terrestrial planets are  made of solid surfaces.

      •Mercury, Venus, Earth and  Mars are the terrestrial  planets.

      The planets in the solar system  are divided into terrestrial and  jovian planets.

      Solar system questions and answers pdf

      MARCURY

      •It is the smallest planet in our solar system (Mercury is only slightly larger  than Earth’s Moon).

      •It is nearest to the Sun.

      •Due  this  much  proximity,  mercury’s  orbit  is  very  much  stretched  into  a long elliptical shape.

      •Revolution : 88 Earth Days.

      •Rotation : 58.65 Earth Days.

      •Mercury has no moons.

      From the surface of Mercury, the Sun would appear more than three times as large as it does when viewed from Earth.

      Solar system questions and answers pdf

      VENUS

      •It is the second planet from the  Sun.

      •It rotates in the opposite direction  (clockwise) to most other planets  with its sun rising in the west and  setting in the east.

      •Venus does not have any moons.

      •Rotaion : 243 Earth Days.

      •Slowest rotation in the solar system.

      •Revolution : 224.7 Earth Days.

      Shukrayaan-1  (2024) is a proposed  orbiter to Venus by  the Indian Space  Research
      Organisation (ISRO) to  study the surface
      and atmosphere of
      Venus.

          • •Venus is by far the hottest planet in the Solar System, even though  Mercury is closer to the Sun. This is because of the greenhouse  effect arising from high concentrations of CO2 and thick atmosphere.

          • •Venus is the brightest planet in the solar system.

          • •Venus is sometimes called Earth’s sister planet or  Earth’s  twin because of their similar size, mass, proximity to the Sun and  presence of similar physical features such as high plateaus, folded  mountain belts, numerous volcanoes, etc.

          • •Venus was often referred to as the morning star and evening star.

        How to draw solar system

        How to draw solar system

        which is the biggest planet of in our solar system-jupiter

        EARTH

        •Earth is the fifth largest planet in the solar system.

        •It is the only world in our solar system with liquid  water on the surface.

        •Earth is the biggest of the four planets closest to the  Sun.

        •Shape: Geoid

        •Rotation : 23 hours 56 min 4 sec

        •Revolution : 365 days 5 hours 48 min 46 sec

        •Average distance from the sun: 149.8 million km

        •Time taken by the light of the sun to reach Earth: 8  min 18 sec.

        MOON

        Neil Armstrong was the  first, and Buzz Aldrin was  the second to step on the  surface of the moon on JULY,1969(APOLLO 11 MISSION)

        •It is the only natural satellite of the planet Earth.

        •It  is  the  fifth  largest  natural  satellite  in  the  Solar  System.

        •It is about 385000/384,400 km away from the Earth.

        •Only  one  side  of  the  moon  is  visible  to  us  on  the  earth.

        •Rotational time:  27 days 7 hours 43 min 11.47 sec

        •Highest  point  on  the  Moon  :  Mt  Leibnitz  (approx.  35,000 ft.) situated on the South Pole of the moon.

        Super Moon

        Also called perigee moon, it occurs when the moon is nearest  the earth. It appears 30% larger.

        Blue Moon

        It is the occurrence of two full moon events in a month. Next will  take place in 2015 and 2018.

        Solar system important questions for SSC and UPSC

        ASTEROID BELT

        •Asteroid Belt objects are made  of rock and stone.

        •The Asteroid Belt contains  billions and billions of asteroids.

        •Some asteroids in the Belt are  quite large, but most range in  size down to pebbles.

        •Gravitational influences can  move asteroids out of the Belt.

        biggest planet of solar system-jupiter

        JUPITAR

        •It is the largest planet in the solar system.

        •Rotation : About 9.8 hours (Fastest rotation)

        •Revolution : 12 Earth years

        •Jupiter is called “the Lord of the Heavens”.

        •Jupiter’s familiar stripes and swirls are  actually cold, windy clouds of ammonia  and water, floating in an atmosphere of  hydrogen and helium.

        •Jupiter’s iconic Great Red Spot is a giant  storm bigger than Earth that has raged  for hundreds of years.

        JUPITAR

        •Jupiter has more than 79 moons.

        •The planet Jupiter’s four largest moons are  called the Galilean satellites after Italian  astronomer Galileo Galilei, who first observed  them in 1610. These large moons are named  Io, Europa, Ganymede, and Callisto.

        •Io is the most volcanically active body in the  solar system.

        •Ganymede is the largest moon in the solar  system.

        •Has an extremely low density as compared to  earth 1.3g

        how many planets in our solar system?- ans-9

        SATURN

        •It is the second largest planet in our solar system.

        •Adorned with thousands of beautiful ringlets, Saturn is unique among  the planets. But the other three giant planets (Jupiter, Uranus,  and Neptune) also have ring systems.

        •Revolution : 29 Earth years.

        •Rotation : About 10.7 Earth hours.

        •Saturn has 82 moons.

        •Titan is the largest moon of Saturn.

        •Titan is the second-largest moon in the Solar System.

        •Phoebe is the satellite that revolves in the opposite direction as that  of Saturn.

        •This planet has the least density in the entire solar system

        URANUS

        •Uranus  is  an  Ice  Giant  planet  and  nearly  four times larger than Earth.

        •Revolution : About 84 Earth years.

        •Rotation : About 17 Earth hours.

        •Uranus has 27 known moons

        •Like  Saturn,  Jupiter  and  Neptune,  Uranus  is a ringed planet.

        •Uranus was discovered in 1781 by William  Herschel.

        •Uranus is the only giant planet whose equator is nearly at right angles  to its orbit.

        •It seems to rotate from north to south as it is inclined at an angle of  98° to its orbit.

        •Uranus  is  known  as  the  “sideways  planet”  because  it  rotates  on  its  side.

        •Uranus  gets  its  blue-green  color  from  methane  atmosphere.

        •Uranus was the first planet found using a telescope.

        •It has a tremendous tilt and hence is called the ‘lying planet’.
        •Just like Venus it also makes a clockwise revolution around the sun.
        •It contains 5 rings around it like Saturn. They are called alpha, beta,  gamma  theta and epsilon.
        •There are various gases present in its atmosphere, therefore it is also  known as Green Planet.

        Solar system important questions for SSC and UPSC

        NEPTUNE

        •It is the most distant planet in our solar  system.

        •Revolution : 165 Earth years.

        •Rotation : 16 Earth hours.

        •It has 14 known moons.

        •Johann  Galle  discovered  the  planet  in  1846.

        PLUTO

        •Pluto was discovered in 1930

        •Claude Tombaugh

        •Pluto has five known moons. They are :

        1.Charon

        2.Nix

        3.Hydra

        4.Kerberos

        5.Styx

        •Pluto has been given the number  134340.

         IMPORTANT QUESTIONS FROM SOLAR SYSTEM

        1. Which of the following part of the Sun is visible to humans?

        A.Photosphere

        B.Corona

        C.Chromospheres

        D.Core

        2. Which of the following part of the Sun is visible at the time of the  eclipse?

        A.Photosphere

        B.Corona

        C.Chromosphere

        D.Core

        3. Select the correct chronology of the planet according to its size?

        I.Mercury

        II.Mars

        III.Venus

        IV.Earth  Code:

        A.IV, III, II, I

        B.I, III, II, IV

        C.I, II, III, IV

        D.IV, I, III, II

        4. Which of the following planets in the Solar System takes the shortest  revolution?

        A.Neptune

        B.Mars

        C.Mercury

        D.Venus

        5. Which planet in the Solar System has the highest density?

        A.Earth

        B.Uranus

        C.Neptune

        D.Jupiter

        6. What is the gap between the orbit of mars and Jupiter called?

        a.Asteroids

        b.Comets

        c.Meteor

        d.Meteorite

        Ans-

        Question Answer
        1 A
        2 B
        3 A
        4 C
        5 A
        6 A

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