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      Class 8 Science

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      • Class 08
      • Class 8 Science
      CoursesClass 08ScienceClass 8 Science
      • Cell- Structure and Function
        6
        • Lecture1.1
          Introduction, Discovery, Cell Theory, Cell Variation, Cell Structure-Cell Wall 31 min
        • Lecture1.2
          Cell Structure and Function -Cell Membrane, Cytoplasm, Nucleus 31 min
        • Lecture1.3
          Cell Structure and Function -Ribosomes, ER, Golgi Bodies, Lysosomes, Mitochondria 38 min
        • Lecture1.4
          Cell Structure and Function – Plastids, Vacuole, Types of Cell 20 min
        • Lecture1.5
          Chapter Notes – Cell
        • Lecture1.6
          NCERT Solutions – Cell
      • Light
        6
        • Lecture2.1
          Plane Mirror, Laws of Reflection 01 hour
        • Lecture2.2
          Multiple Reflection,Dispersion 41 min
        • Lecture2.3
          Human Eye 59 min
        • Lecture2.4
          Light Introduction 10 min
        • Lecture2.5
          Chapter Notes – Light
        • Lecture2.6
          NCERT Solutions -Light
      • Synthetic Fibers an Plastics
        3
        • Lecture3.1
          Introduction, Natural Fiber, Synthetic Fibers, Plastics and its Uses, Biodegradable & non-biodegradable wastes, Effect of Plastics on Environment 45 min
        • Lecture3.2
          Chapter Notes – Synthetic Fibers an Plastics
        • Lecture3.3
          NCERT Solutions – Synthetic Fibers an Plastics
      • Coal and Petroleum
        4
        • Lecture4.1
          Introduction, Natural Resources, Fuel-Coal 16 min
        • Lecture4.2
          Fuel-Petroleum, Natural Gas 18 min
        • Lecture4.3
          Chapter Notes – Coal and Petroleum
        • Lecture4.4
          NCERT Solutions – Coal and Petroleum
      • Stars and The Solar System
        6
        • Lecture5.1
          Celestial Objects or Heavenly Bodies 27 min
        • Lecture5.2
          Stars, Constellations 23 min
        • Lecture5.3
          Solar System 35 min
        • Lecture5.4
          Asteroids, Comets and Satellites 31 min
        • Lecture5.5
          Chapter Notes – Stars and The Solar System
        • Lecture5.6
          NCERT Solutions – Stars and The Solar System
      • Pollution of Air and Water
        5
        • Lecture6.1
          Air Pollution 21 min
        • Lecture6.2
          Greenhouse 50 min
        • Lecture6.3
          Water Pollution 30 min
        • Lecture6.4
          Chapter Notes – Pollution of Air and Water
        • Lecture6.5
          NCERT Solutions – Pollution of Air and Water
      • Force and Pressure
        4
        • Lecture7.1
          Force 12 min
        • Lecture7.2
          Pressure 45 min
        • Lecture7.3
          Chapter Notes – Force and Pressure
        • Lecture7.4
          NCERT Solutions – Force and Pressure
      • Friction
        3
        • Lecture8.1
          Introduction 25 min
        • Lecture8.2
          Chapter Notes – Friction
        • Lecture8.3
          NCERT Solutions – Friction
      • Sound
        4
        • Lecture9.1
          Introduction, Production & Propagation and Medium 41 min
        • Lecture9.2
          Reflection Of Sound 16 min
        • Lecture9.3
          Chapter Notes – Sound
        • Lecture9.4
          NCERT Solutions – Sound
      • Materials: Metals and Non-Metals
        4
        • Lecture10.1
          Physical Properties of metals and non-metals-1 25 min
        • Lecture10.2
          Physical Properties of metals and non-metals-2 06 min
        • Lecture10.3
          Chapter Notes – Materials: Metals and Non-Metals
        • Lecture10.4
          NCERT Solutions – Materials: Metals and Non-Metals

        NCERT Solutions – Stars and The Solar System

        Q.1 Which of the following is not a member of the solar system?
        (a) An asteroid
        (b) A satellite
        (c) A constellation
        (d) A comet
        Sol. (c) A constellation

        Q.2 Which of the following is not a planet of the sun?
        (a) Sirius
        (b) Mercury
        (c) Saturn
        (d) Earth
        Sol. (a) Sirius

        Q.3 Phases of the moon occur because
        (a) We can see only that part of the moon which reflects light towards us.
        (b) Our distance from the moon keeps changing.
        (c) The shadow of the earth covers only a part of moon’s surface.
        (d) The thickness of the moon’s atmosphere is not constant.
        Sol. (a) We can see only that part of the moon which reflects light towards us.

        Q.4 Fill in the blanks:
        (a) The planet which is farthest from the sun is ____________.
        (b) The planet which appears reddish in colour is ____________.
        (c) A group of stars that appear to form a pattern in the sky is known as a ____________.
        (d) A celestial body that revolves around a planet is known as __________.
        (e) Shooting stars are actually not ____________.
        (f) Asteroids are found between the orbits of _________ and _________.
        Sol. (a) The planet which is farthest from the sun is Neptune.
        (b) The planet which appears reddish in colour is Mars.
        (c) A group of stars that appear to form a pattern in the sky is known as a constellation.
        (d) A celestial body that revolves around a planet is known as satellite.
        (e) Shooting stars are actually not stars.
        (f) Asteroids are found between the orbits of Mars and Jupiter.

        Q.5 Mark the following statements as true (t) or false (f):
        (a) Pole star is a member of the solar system.                                     ( )
        (b) Mercury is the smallest planet of the solar system.                       ( )
        (c) Uranus is the farthest planet in the solar system.                           ( )
        (d) Insat is an artificial satellite.                                                          ( )
        (e) There are nine planets in the solar system.                                    ( )
        (f) Constellation orion can be seen only with a telescope.                  ( )
        Sol. (a) Pole star is a member of the solar system.                              (f)
        (b) Mercury is the smallest planet of the solar system.                        (t)
        (c) Uranus is the farthest planet in the solar system.                           (f)
        (d) Insat is an artificial satellite.                                                          (t)
        (e) There are nine planets in the solar system.                                    (f)
        (f) Constellation orion can be seen only with a telescope.                  (f)

        Q.6 Match items in column a with one or more items in column b:
        A                                       b
        (i) Inner planets                       (a) Saturn
        (ii) Outer planets                     (b) Pole star
        (iii) Constellation                    (c) Great bear
        (iv) Satellite of the earth         (d) Moon
        (e) Earth
        (f) Orion
        (g) Mars
        Sol.       A                                      b
        (i) Inner planets                       (g) Mars, (e) Earth
        (ii) Outer planets                     (a) Saturn
        (iii) Constellation                    (c) Great bear, (f) Orion
        (iv) Satellite of the earth         (d) Moon

        Q.7 In which part of the sky can you find venus if it is visible as an evening star?
        Sol. Venus is visible in the western horizon after sunset in the sky.

        Q.8 Name the largest planet of the solar system.
        Sol. The largest planet of the solar system is jupiter.

        Q.9 What is a constellation? Name any two constellations.
        Sol. The different known shapes that are formed by a group of stars is known as a constellation. Example: ursa major and orion.

        Q.10 Draw sketches to show the relative positions of prominent stars in (a) Ursa major and (b) Orion.
        Sol. The sketches are as follows:
        (a) Ursa major:(b) Orion:

        Q.11 Name two objects other than planets which are members of the solar system.
        Sol. The two objects other than planets which are members of the solar system are comets and asteroids.

        Q.12 Explain how you can locate the pole star with the help of ursa major.
        Sol. To find the location of pole star with the help of ursa major, consider the two stars at the end of the bowl of ursa major. Now, draw an imaginary straight line in northern direction connecting these two stars. The imaginary line would meet a star known as pole star. The distance of pole star is around five times away from the bowl.

        Q.13 Do all the stars in the sky move? Explain.
        Sol. No, all the stars do not move. The movement of all stars in the sky is from east to west except pole star. With respect to earth, the pole star looks stationary because it is located above the axis of rotation of the earth in the north direction.

        Q.14 Why is the distance between stars expressed in light years? What do you understand by the statement that a star is eight light years away from the earth?
        Sol. The distance in-between stars and between earth and stars are in range of millions of kilometres. So, these distances cannot be expressed in kilometres; hence, distance between stars is expressed in light years.
        One light year is the distance travelled by light in one year. One light year is equal to 9.46 × 1012 km.
        A star located at eight light years away from earth means that the distance between the star and the earth is equal to the distance travelled by light in years. In figures, eight light years will be equal to 8 x 9.46 × 1012 km = 7.6 × 1013 km.

        Q.15 The radius of jupiter is 11 times the radius of the earth. Calculate the ratio of the volumes of jupiter and the earth. How many earths can jupiter accomodate?
        Sol. Given that the radius of jupiter is 11 times the radius of the earth. Suppose the radius of earth be r, then the radius of the jupiter will be 11r.
        Therefore, ratio of volumes of jupiter and earth = (volume of jupiter)/(volume of earth)
        = (4/3 π (11r3))/ (4/3 π (r3))
        = 1331/1
        = 1331:1
        Hence, jupiter can accommodate 1331 number of earths.

        Q.16 Boojho made the following sketch (fig.) Of the solar system. Is the sketch correct? If not, correct it.Sol. The sketch made by boojho is not correct because the position of mars, venus, uranus and neptune are wrong. The position of mars & venus and uranus & neptune should be interchanged. The correct sketch is as shown below:

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