66. The wire having a red plastic covering is a

1. 1. Line wire

   
   
   

   2. Neutral wire

   
   
   

   3. Earth wire

   
   
   

   4. None of these

   
   
   

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   NA

   Correct Option: A

   NA

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67. 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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   NA

   Correct Option: B

   NA

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68. The wire having a green plastic covering is a

1. 1. Line wire

   
   
   

   2. Neutral wire

   
   
   

   3. Earth wire

   
   
   

   4. None of these

   
   
   

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   NA

   Correct Option: C

   NA

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69. When a glass rod is rubbed with silk, both glass rod and silk

1. 1. Acquire equal and similar charges

   
   
   

   2. Acquire equal and opposite charges

   
   
   

   3. Acquire unequal and opposite charges

   
   
   

   4. Acquire unequal and similar charges

   
   
   

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   NA

   Correct Option: B

   NA

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70. A suitable unit for expressing electric field strength is

1. 1. V / C

   
   
   

   2. A - m

   
   
   

   3. C / m²

   
   
   

   4. N / C

   
   
   

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   NA

   Correct Option: D

   NA

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