TEST PAPER 2 - UNIT 2 - 25 MARKS

There are 14 questions in all and time limit is 45 minutes.

SECTION - A : CHOOSE APPROPRIATE ALTERNATIVE : [1 mark each, Total marks 4]

1. The equivalent resistance of three resistors, each of 6 Ω, connected in parallel is ______.
   
   
   
   1. 6 Ω
   2. 18 Ω
   3. 2 Ω
   4. 0.5 Ω
      
   
   
2. Which of the following is not correct for the electrical work ?
   
   
   
   1. W = VQ
   2. W = VIt
   3. W = I²Rt
   4. W = I²RQ
      
   
   
3. What is the frequency of current used domestically in India ?
   
   
   
   1. 50 Hz
   2. 60 Hz
   3. 110 Hz
   4. 220 Hz
      
   
   
4. The principle of magnetic induction was given by ______.
   
   
   
   1. Faraday
   2. Galileo
   3. Oersted
   4. Ampere
      
   
   

   SECTION - B : ANSWER IN SHORT : [1 mark each, Total marks 4]

   
   
5. Define : Electrical potential.
6. What causes resistance in a conductor ?
7. What is over-loading ?
8. What is alternating current(AC) ?
   

   SECTION - C : ANSWER IN BRIEF : [2 marks each, Total marks 6]

   
   
9. State two disadvantages of series connection.
10. If 300 mA current passes through a lamp, how many electrons will pass through it in 1 minute ?
11. Explain the work(importance) of a fuse.
    

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

    
    
12. Explain the construction and working of a simple Voltaic cell.
13. Explain the experiment to show the presence of magnetic field due to electric current.
    

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

    
    
14. Describe Ohm's experiment OR Describe electric motor with neat diagram.