NCERT solution for class 8 > Science . > Chapter 17 - Stars and the solar system

NCERT Solution solution >  class 8 > Science 

Chapter 17 -Stars and the solar system 

Q1. Choose the correct answer in question 1-3 

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 

2. Which of the following is not a planet of the Sun ? 

a) sirius     b) Mercury     c) Saturn      d) Earth 

3. Phases of the moon occur because 

a) we can see only that part of the moon which reflect light towards us 

b) Our distance from the moon keeps changing  

c) The shadow of the earth covers only a part of the moon surface  .

d) The thickness of the moon's atmosphere is not constant 

Q4. Fill in the blanks 

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 appears 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 star are actually not stars .

f) Asteroids are found between the orbits of Mars and Jupiter 

Q5. Mark the following statements as true or false 

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 of 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  

Answer - a) true 

b) true 

c) false 

d) true 

e) false 

f) false

Q6 . Match items in column a with one or more items in column b 

         Column A                         Column B

  1.    Inner planets                         Saturn 
  2.   Outer planets                         Polestar 
  3.   Constellation                         Great bear 
  4.   Satellite of the earth                Moon 
  5.                                                         Earth 
  6.                                                          Orion 
  7.                                                           Mars 

Answer- 

         Column A                         Column B

  1.   Inner planets                Earth ,Mars     
  2.  Outer planets                   Saturn 
  3.   Constellation          Great bear , Orion 
  4. Satellite of the earth                Moon 

                                                    

Q7. In which part of the sky can you find Venus if it is visible as an evening star 

Answer - It is visible in in western sky just after the sunset as an evening star

Q8. Name the largest planet of the solar system 

Answer - Jupiter is the largest planet of solar system 

Q9. What is a constellation name any two constellation ? 

Answer - Constellations are a group of stars that appears to form a recognisable shapes .

Ex- Orion  ,Ursa major 

Q10 . Draw sketches to show the relative position of prominent star in a) Ursa  major and  b) Orion 

Answer - Ursa major 

Orion 

Q11. Name two objects other than planets which are members of a solar system  

Answer - Two objects other than the planets are asteroids and comets .

Q12. Do all the stars in the sky move explain ? 

Answer - No all the stars present in the sky does not move this is happen due to the rotation of the earth around the sun.

Q13. Explain how you can locate the pole star with the help of Ursa Major ? 

Answer - Two stars at the end of the Ursa major  draw the straight imaginary line through the star and extend these imaginary line towards the north direction this line will lead to star which is not too bright and this is a pole star  


Q14. Why the distance between stars expressed in light years what do you understand by the statement that a star is 8 light years away from the Earth?  

Answer - Stars are very far away from the Earth surface .We are not able to measure their distance in km so the larger distance is expressed in the another unit which is known as light year and This is the distance travelled by light in one year. The stars is 8 light years away from the Earth means the light comes from the stars reaches to earth earth in 8 light years. 

Q15 . 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 earth can Jupiter accommodate 

Answer - 

Suppose the radius of the earth is = r 

Radius of Jupiter  = 11 r 

Volume of Earth = 4/3πr3 

Volume of Jupiter = 4/ 3π (11r3)  

                                  = 1331(4/3πr3) 

        Volume of Jupiter  / volume of Earth 

1331(4/3πr3)/ 4/3πr3 

= 1331 

Means  1331 Earth can be accommodate in Jupiter 

Q16 . Boojho made the following sketch of the solar system is the sketch correct if not correct it 


Answer - No Boojho draw a wrong sketch the correct sketch is following  



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