111. 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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   NA

   Correct Option: B

   NA

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112. The colour of the + ve column in a gas discharge tube depends on

1. 1. The type of glass used to construct the tube

   
   
   

   2. The gas in the tube

   
   
   

   3. The applied voltage

   
   
   

   4. The material of the cathode

   
   
   

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   NA

   Correct Option: B

   NA

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113. 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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   NA

   Correct Option: B

   NA

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114. When yellow light is incident on a surface no electrons are emitted while green light can emit. If red light is incident on the surface then

1. 1. No electrons are emitted

   
   
   

   2. Photons are emitted

   
   
   

   3. Electrons of higher energy are emitted

   
   
   

   4. Electrons of lower energy are emitted

   
   
   

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   NA

   Correct Option: A

   NA

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115. Gamma rays are

1. 1. Single ionized gas atom

   
   
   

   2. Helium nucleus

   
   
   

   3. Fast moving electron

   
   
   

   4. Electromagnetic waves

   
   
   

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   NA

   Correct Option: D

   NA

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