16. In a dry cell (battery), which of the following are used a electrolytes?

1. 1. Ammonium chloride and zine chloride

   
   
   

   2. Sodium chloride and calcium chloride

   
   
   

   3. Magnesium chloride and zinc chloride

   
   
   

   4. Ammonium chloride and calcium chloride

   
   
   

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   N/A

   Correct Option: A

   N/A

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17. Assertion (A) : In our houses, the current in AC electricity line changes direction 60 times per second.
    Reason (R): The frequency of alternating voltage supplied is 50 Hz.

1. 1. Both A and R are individually true and R is the correct explanation of A.

   
   
   

   2. Both A and R are individually true but R is not the correct explanation of A

   
   
   

   3. A is true but is false

   
   
   

   4. A is false but R is true

   
   
   

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   N/A

   Correct Option: D

   N/A

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18. In the case of a bar magnet, the line of magnetic induction

1. 1. Start from the north pole and end at the south pole

   
   
   

   2. Run continuously through the bar and outside

   
   
   

   3. Emerge in circular paths from the middle of the bar

   
   
   

   4. None of the above

   
   
   

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   N/A

   Correct Option: B

   N/A

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19. Four wires of same material and of dimensions as mentioned below are stretched by a load of same magnitude separately. Which one of them will be elongated maximum?

1. 1. Wire of 1 m length and 2 mm diameter

   
   
   

   2. Wire of 2 m length and 2 mm diameter

   
   
   

   3. Wire of 5 m length and 105 mm diameter

   
   
   

   4. Wire of 1 m length and 1 mm diameter

   
   
   

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   N/A

   Correct Option: C

   N/A

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20. One wb / m² is equal to

1. 1. 10⁴ gauss

   
   
   

   2. 10² gauss

   
   
   

   3. 10^-2 gauss

   
   
   

   4. 10^-4 gauss

   
   
   

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   N/A

   Correct Option: A

   N/A

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