TEST PAPER 9 - UNITS 1,2,3 - 50 MARKS

There are 27 questions in all and time limit is 90 minutes.

SECTION - A : CHOOSE APPROPRIATE ALTERNATIVE : [1 mark
each, Total marks 7]

1. "There is plenty of room at the bottom." This was stated by...
   
   
   
   1. Issac Newton
   2. Albert Einstein
   3. Richard Feynman
   4. Eric Drexler
      
   
   
2. The mirror formula is ______.
   
   
   
   1. (1/u)-(1/v) = (1/f)
   2. (1/f)+(1/u) = (1/v)
   3. f = uv/(u+v)
   4. f = (u+v)/uv
      
   
   
3. In a transparent medium, the velocity of ______ light is the least.
   
   
   
   1. red
   2. green
   3. yellow
   4. violet
      
   
   
4. 1 unit of domestic electric energy is equal to...
   
   
   
   1. 1 joule
   2. 1 watt-second
   3. 3.6 x 10⁶ j
   4. 3.6 x 10⁶ kwh
      
   
   
5. The current passing through two separate lines(circuits) of our houses is ______ A and ______ A.
   
   
   
   1. 5,10
   2. 5,15
   3. 10,15
   4. 2,5
      
   
   
6. During the refining of petroleum, the fraction having highest boiling temperature...
   
   
   
   1. condenses first
   2. condenses last
   3. does not condense
   4. remains in gaseous form
      
   
   
7. ______ is the largest planet of our solar system.
   
   
   
   1. Earth
   2. Jupiter
   3. Saturn
   4. Neptune
      
   
   
   
   

   SECTION - B : ANSWER IN SHORT : [1 mark each, Total
   marks 8]
   

8. What is a bucky tube ?
9. What is an image ?
10. Current flows in a wire. Can we call the wire charged ? Why ?
11. Define : Induced electric current.
12. Define : Solar constant.
13. What is the full form of KVIC ?
14. What are meteors ?
15. What is the basic concept(belief) of Steady-state theory ?
    
    

    SECTION - C : ANSWER IN BRIEF : [2 marks each, Total
    marks 10]
    

16. Mention applications of bucky ball and carbon nanotubes.
17. An object is placed at 30 cm in front of a convex lens of focal length 20 cm. Find the position of its image.  OR  Draw the ray diagram to show working of a compound microscope.
18. What is electrolysis ? Write Faraday's laws of electrolysis.  OR  Mention disadvantages of using direct current(DC).
19. Mention two categories of solar appliances with examples.
20. Mention the names and the characteristics of terrestrial planets.
    
    

    SECTION - D : ANSWER THE FOLLOWING : [3 marks each,
    Total marks 15]
    

21. Mention the role of nanotechnology in security.
22. Describe with the help of a diagram how the seven colours of light can be combined to get white light.
23. Explain : Electric potential and electric potential difference.
24. Explain : Solar water heater with diagram.  OR  Describe construction and working of a biogas plant(no diagram).
25. Write a note on Nakshatras.  OR  Mention six uses of artificial satellites.
    
    

    SECTION - E : ANSWER IN DETAIL : [5 marks each, Total
    marks 10]
    

26. Derive the generalised form of Snell's law.
27. Derive the expression for equivalent resistance(R) when three resistors R₁,R₂ and R₃ are connected in parallel and find the current flowing through a circuit containing three resistors of 10 Ω, 5 Ω, and 5 Ω connected in parallel with potential difference 4 V.  OR  Describe the principle and working of an electric generator with diagram.