1. Voltage applied between the electrodes of discharge tube is of the nature

1. 1. 220 V alternating voltage

   
   
   

   2. 220 V DC voltage

   
   
   

   3. Variable voltage

   
   
   

   4. Voltage obtained by induction coil

   
   
   

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   NA

   Correct Option: D

   NA

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2. Neutron was discovered by

1. 1. J.J. Thomson

   
   
   

   2. James Chadwick

   
   
   

   3. Rutherford

   
   
   

   4. none of these

   
   
   

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   NA

   Correct Option: B

   NA

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3. The important conclusion given by Millikan's experiment about the charge is

1. 1. Charge is never quantized

   
   
   

   2. Charges has no definite value

   
   
   

   3. Charge is quantized

   
   
   

   4. Charge on oil drop always increases

   
   
   

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   NA

   Correct Option: C

   NA

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4. The main source of solar energy is

1. 1. Nuclear fission

   
   
   

   2. Nuclear fusion

   
   
   

   3. Combustion

   
   
   

   4. None of these

   
   
   

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   NA

   Correct Option: B

   NA

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5. In photoelectric effect, the number of photo electrons emitted is proportional to

1. 1. Intensity of incident beam

   
   
   

   2. Frequency of incident beam

   
   
   

   3. Velocity of incident beam

   
   
   

   4. Work function of photo cathode

   
   
   

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   NA

   Correct Option: A

   NA

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