151. A moving charged is subjected to an external magnetic field. The change in the kinetic energy of the particle

1. 1. Increases with the increase in the field strength

   
   
   

   2. Decreases with the increase in the field strength

   
   
   

   3. Is always zero

   
   
   

   4. Depends upon whether the field is uniform or non-uniform

   
   
   

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   N/A

   Correct Option: C

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152. What is the difference between a CFL and an LED LAMP ?
     1. To produce light, a CFL uses mercury vapour and phosphor while an LED lamp uses semi-conductor material.
     2. The average life span of a CFL is much longer than of an LED lamp.
     3. A CFL is LESS energy-efficient as compared to an LED lamp.
     Which of the statements given above is / are correct ?

1. 1. 1 only

   
   
   

   2. 2 and 3

   
   
   

   3. 1 and 3

   
   
   

   4. 1, 2 and 3

   
   
   

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   N/A

   Correct Option: C

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153. In electric supply lines in India, Which parameter is kept constant?

1. 1. Voltage

   
   
   

   2. Current

   
   
   

   3. Frequency

   
   
   

   4. Power

   
   
   

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   N/A

   Correct Option: C

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154. What is the maximum number of different electrical combination possible with equal resistances?

1. 1. 2

   
   
   

   2. 3

   
   
   

   3. 4

   
   
   

   4. 5

   
   
   

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   N/A

   Correct Option: C

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155. Four wires of same material and of dimensions as mentioned below are stretched by a load of same magnitude separately. Which one of them will be elongated maximum?

1. 1. Wire of 1 m length and 2 mm diameter

   
   
   

   2. Wire of 2 m length and 2 mm diameter

   
   
   

   3. Wire of 5 m length and 105 mm diameter

   
   
   

   4. Wire of 1 m length and 1 mm diameter

   
   
   

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1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: C

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