86. Which of the following will deflect in electric field ?

1. 1. Y - rays

   
   
   

   2. X - rays

   
   
   

   3. Cathode rays

   
   
   

   4. Ultraviolet rays

   
   
   

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   NA

   Correct Option: C

   NA

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87. Isotopes have the same

1. 1. Atomic number

   
   
   

   2. Mass number

   
   
   

   3. avogadro's number

   
   
   

   4. None of these

   
   
   

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   NA

   Correct Option: A

   NA

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88. The nuclear force

1. 1. Obeys inverse square law of distance

   
   
   

   2. Obeys inverse third power law of distance

   
   
   

   3. Is a short range force

   
   
   

   4. Is equal in strength to the electromagnetic force

   
   
   

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   NA

   Correct Option: C

   NA

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89. 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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90. 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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