TEST PAPER 21 : CHAPTER 7 : UNIVERSE : 25 MARKS

There are 13 questions in all and time limit is 45 minutes.

SECTION - A : CHOOSE APPROPRIATE ALTERNATIVE : [1 mark each, Total marks 3]

1. Sun rises in the west on ______.
   
   
   
   1. Mercury
   2. Mars
   3. Pluto
   4. Venus
      
   
   
2. 1 light year = ______ km.
   
   
   
   1. 9.46 x 10¹¹
   2. 9.46 x 10¹²
   3. 4.96 x 10¹¹
   4. 4.96 x 10¹²
      
   
   
3. The minimun velocity required for a satellite to remain in the orbit is ______.
   
   
   
   1. 8 km/s
   2. 8 km/h
   3. 800 km/h
   4. 800 m/s
      
   
   

   SECTION - B : ANSWER IN SHORT : [1 mark each, Total marks 3]
   

4. What is 'photosphere' ?
5. Name two planets which do not have natural satellites.
6. What is the speed of revolution of Sun ?
   
   

   SECTION - C : ANSWER IN BRIEF : [2 marks each, Total marks 8]
   

7. Define solar system and write the names of the planets in the ascending order of their distance from sun.
8. Write four points about saturn.
9. Mention two major disasters of space shuttles.
10. Mention uses of artificial satellites in communication.
    
    

    SECTION - D : ANSWER THE FOLLOWING : [3 marks each, Total marks 6]
    

11. Explain how the space shuttle is brought back from space.
12. Write six major points about asteroids.
    
    

    SECTION - E : ANSWER IN DETAIL : [5 marks each, Total marks 5]
    

13. Write a detailed note on comets.