201. 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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202. When the hot and cold junctions of a thermocouple are interchanged the theromo-emf

1. 1. Becomes zero

   
   
   

   2. Becomes double

   
   
   

   3. Remains same

   
   
   

   4. Changes sign

   
   
   

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   NA

   Correct Option: D

   NA

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203. For electroplating a spoon, it is placed in the voltameter at

1. 1. The position of anode

   
   
   

   2. The position of cathode

   
   
   

   3. Anywhere in the electrolyte

   
   
   

   4. None of the above

   
   
   

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   NA

   Correct Option: B

   NA

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204. If the length of a wire is doubled and its cross section is also doubled, then its resistance will

1. 1. Become one fourth

   
   
   

   2. Become four times

   
   
   

   3. Become two times

   
   
   

   4. Remain unchanged

   
   
   

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   NA

   Correct Option: D

   NA

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205. The resistance of a wire is R, It is stretched uniformly so that its length is doubled. The resistance now becomes

1. 1. 2 R

   
   
   

   2. R / 2

   
   
   

   3. 4 R

   
   
   

   4. R / 4

   
   
   

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   NA

   Correct Option: C

   NA

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