21. In a dry cell (battery), which of the following are used a electrolytes?

1. 1. Ammonium chloride and zine chloride

   
   
   

   2. Sodium chloride and calcium chloride

   
   
   

   3. Magnesium chloride and zinc chloride

   
   
   

   4. Ammonium chloride and calcium chloride

   
   
   

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   N/A

   Correct Option: A

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22. 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

   N/A

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23. The deflection in moving coil galvanometer is

1. 1. Directly proportional to the torsional constant

   
   
   

   2. Inversely proportional to the area of the coil

   
   
   

   3. Inversely proportional to the current

   
   
   

   4. Directly proportional to the number of turns in the coil

   
   
   

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   N/A

   Correct Option: D

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24. 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

   N/A

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25. What is the order of magnitude of electric resistance of the human body (dry) ?

1. 1. 10² ohm

   
   
   

   2. 10⁴ ohm

   
   
   

   3. 10⁶ ohm

   
   
   

   4. 10⁸ ohm

   
   
   

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1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: C

   N/A

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