51. Direct conversion of solar energy with the use of photovoltaic cell results in the production of

1. 1. Optical energy

   
   
   

   2. Electrical energy

   
   
   

   3. Thermal energy

   
   
   

   4. Mechanical energy

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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52. The first explosion of an atomic device in India was carried out in the state of

1. 1. Jammu and Kashmir

   
   
   

   2. Nagaland

   
   
   

   3. Manipur

   
   
   

   4. Rajasthan

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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53. In which of the following decays, the atomic number decreases ?

1. 1. β^- - decay

   
   
   

   2. β⁺ - decay

   
   
   

   3. α - decay

   
   
   

   4. b and c both

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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54. The maximum number of photo electrons released in photocell is independent of

1. 1. Nature of the cathode surface

   
   
   

   2. Frequency of incident ray

   
   
   

   3. Intensity of radiations incident on cathode surface

   
   
   

   4. None of the above

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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55. Which of the following is not the property of cathode rays ?

1. 1. At produces heating effect

   
   
   

   2. It does not deflect in electric field

   
   
   

   3. Its casts shadow

   
   
   

   4. It produces fluorescence

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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