131. Nuclear fusion is the source of energy in

1. 1. Sun and atom bomb

   
   
   

   2. Nuclear reactor and sun

   
   
   

   3. Sun and hydrogen bomb

   
   
   

   4. Nuclear reactor and atom bomb

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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132. The velocity of photo electron emitted in photoelectric effect depends only on

1. 1. The frequency and intensity of incident light

   
   
   

   2. The frequency of inicdent light

   
   
   

   3. Both (a) and (b)

   
   
   

   4. The wave length of incident light

   
   
   

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   NA

   Correct Option: D

   NA

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133. Which of the following is wrongly matched ?

1. 1. Barometer - pressure

   
   
   

   2. Lactometer - milk

   
   
   

   3. Coulomb's law - charges

   
   
   

   4. Nuclear reactor - electron

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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134. The matter waves are

1. 1. e.m. waves

   
   
   

   2. Sound waves

   
   
   

   3. Mechanical waves

   
   
   

   4. Probability waves

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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135. Heavy water is used as a moderator in a nuclear reactor. The function of the moderator is

1. 1. To control the energy released in the reactor

   
   
   

   2. To absorb neutrons and stop the chain reaction

   
   
   

   3. To cool the reactor

   
   
   

   4. To slow down the neutrons to thermal energy

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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