81. Two electric bulbs whose resistances are in the ratio 1 : 2 are connected in parallel to a constant voltage source. the power dissipated in them have the ratio

1. 1. 1 : 2

   
   
   

   2. 1 : 1

   
   
   

   3. 2 : 1

   
   
   

   4. 1 : 4

   
   
   

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   N/A

   Correct Option: C

   N/A

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82. 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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   N/A

   Correct Option: C

   N/A

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83. A large magnet is broken into two pieces. If lengths of two pieces are in the ratio of 3 : 4 what is the ratio of their pole strengths?

1. 1. 3 : 4

   
   
   

   2. 4 : 3

   
   
   

   3. 1 : 1

   
   
   

   4. 3 : 2

   
   
   

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   N/A

   Correct Option: C

   N/A

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84. Magnetic permeability is maximum for

1. 1. Diamagnetic substances

   
   
   

   2. Paramagnetic substances

   
   
   

   3. Ferromagnetic substances

   
   
   

   4. All of the above

   
   
   

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1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: C

   N/A

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85. 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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