166. Five bulbs each rated as 220V 100 W burnt 4 hours. What is the cost of electricity consumed it the rate is 50 paise per unit?

1. 1. ₹ 1

   
   
   

   2. ₹ 2

   
   
   

   3. ₹ 4

   
   
   

   4. ₹ 8

   
   
   

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1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: A

   N/A

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167. Electromagnets are used in

1. 1. Electric balls only

   
   
   

   2. Telephone only

   
   
   

   3. Dynamos only

   
   
   

   4. All of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: D

   N/A

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168. A carbon microphone is best used in a

1. 1. Dynamo

   
   
   

   2. Telephone

   
   
   

   3. Transformer

   
   
   

   4. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: B

   N/A

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169. Curie temperature of iron is the temperature below which it is

1. 1. Superconducting

   
   
   

   2. Radioactive

   
   
   

   3. Ferromagnetic

   
   
   

   4. Diamagnetic

   
   
   

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1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: C

   N/A

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170. Alternating current instead of direct current is used in long distance electric transmission because

1. 1. It is easy to generate

   
   
   

   2. Rectification is possible

   
   
   

   3. Energy losses are minimum

   
   
   

   4. It causes fewer accidents

   
   
   

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1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: C

   N/A

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