116. Penetrating power of X-rays does not depend on

1. 1. Wavelength

   
   
   

   2. Energy

   
   
   

   3. Potential difference

   
   
   

   4. Current in the filament

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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117. Consider the following statements
     1. Light of longer wavelength is scattered much more than the light of shorter wavelength.
     2. The speed of visible light in water is 0.95 times the speed in vacuum.
     3. Radio waves are produced by rapidly oscillating electrical currents.
     4. To detect the overspending vehicles, police use the Doppler effect of reflected short radio waves
     Which of these statements are correct?

1. 1. 1 and 2

   
   
   

   2. 1 and 3

   
   
   

   3. 2 and 4

   
   
   

   4. 3 and 4

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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118. When X -rays are produced, then

1. 1. Heat is produced on the target

   
   
   

   2. Heat is observed by the target

   
   
   

   3. Temperature of the target is being constant

   
   
   

   4. A luminous light is to be seen on the target

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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119. Structure of solids is investigated by using

1. 1. cosmic rays

   
   
   

   2. X - rays

   
   
   

   3. y - rays

   
   
   

   4. Infrared radiation

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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120. The walls of the halls built for music concerts should

1. 1. Amplify sound

   
   
   

   2. Reflect sound

   
   
   

   3. Ransmit sound

   
   
   

   4. Absorb sound

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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