61. Which of the following quantities remains constant in a step-down transformer?

1. 1. Current

   
   
   

   2. Voltage

   
   
   

   3. Power

   
   
   

   4. None of these

   
   
   

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   NA

   Correct Option: C

   NA

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62. By inserting a soft iron piece into solenoid, the strength of the magnetic field

1. 1. Increase

   
   
   

   2. Decrease

   
   
   

   3. First increase then decrease

   
   
   

   4. Remains unchanged

   
   
   

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   NA

   Correct Option: A

   NA

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63. If a current is passed in a spring, it

1. 1. Gets compressed

   
   
   

   2. Gets expanded

   
   
   

   3. Oscillates

   
   
   

   4. Remains unchanged

   
   
   

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   NA

   Correct Option: A

   NA

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64. A particle is moving in a uniform magnetic field.

1. 1. Its momentum changes but total energy remains same

   
   
   

   2. Both momentum and total energy remains same

   
   
   

   3. Both momentum and total energy change

   
   
   

   4. Total energy changes but momentum remains the same

   
   
   

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   NA

   Correct Option: A

   NA

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65. A substance, when inserted between the poles of a magnet, is pushed out, it is

1. 1. Diamagnetic

   
   
   

   2. Paramagnetic

   
   
   

   3. Ferromagnetic

   
   
   

   4. None of these

   
   
   

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   NA

   Correct Option: A

   NA

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