56. A steady current is flowing is flowing in a conductor of non-uniform cross-section. The charge passing through and cross-section per unit time is

1. 1. Directly proportional to the area of cross-section

   
   
   

   2. Inversely proportional to the area of cross-section

   
   
   

   3. Proportional to square of the area of cross-section

   
   
   

   4. Independent of the area of cross-section

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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57. The terminal potential difference of a battery exceeds its emf. When it is connected

1. 1. In parallel with a battery of higher emf.

   
   
   

   2. In series with a battery of higher emf.

   
   
   

   3. In series with a battery of lower emf.

   
   
   

   4. In parallel with battery of lower emf

   
   
   

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   NA

   Correct Option: A

   NA

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58. If a bar magnet is cut length wise into 3 parts, the total number of poles will be

1. 1. 2

   
   
   

   2. 3

   
   
   

   3. 4

   
   
   

   4. 6

   
   
   

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   NA

   Correct Option: D

   NA

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59. The electric field due to point charge at a distance R form it is E. If the same charge is placed on a metallic sphere of Radius R, the electric field on the surface of the sphere will be

1. 1. zero

   
   
   

   2. E / 2

   
   
   

   3. E

   
   
   

   4. 2 E

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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60. The wire having black plastic covering is a

1. 1. Line wire

   
   
   

   2. Neutral wire

   
   
   

   3. Earth wire

   
   
   

   4. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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