16. The mass defect per nucleon is called

1. 1. Binding energy

   
   
   

   2. Packing fraction

   
   
   

   3. Ionization energy

   
   
   

   4. Excitation energy

   
   
   

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   NA

   Correct Option: B

   NA

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17. In nuclear reaction, there is conservation of

1. 1. Mass only

   
   
   

   2. Energy only

   
   
   

   3. Momentum only

   
   
   

   4. Mass energy and momentum

   
   
   

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   NA

   Correct Option: D

   NA

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18. Beta rays emitted by radioactive substance are

1. 1. Electromagnetic radiations

   
   
   

   2. Charged particles emitted by the nucleus

   
   
   

   3. Electrons orbiting around the nucleus

   
   
   

   4. None of the above

   
   
   

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   NA

   Correct Option: B

   NA

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19. Photoelectric effect can be explained by assuming that light

1. 1. Is a form of transverse wave

   
   
   

   2. Is a form of longitudinal wave

   
   
   

   3. Can be polarised

   
   
   

   4. Consists of quanta

   
   
   

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   NA

   Correct Option: D

   NA

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20. Radioactivity was discovered by

1. 1. J.J. Thomson

   
   
   

   2. W. Roentgen

   
   
   

   3. H. Becquerel

   
   
   

   4. M. Curie

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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