1. Einstein got noble prize for

1. 1. Photoelectric effect

   
   
   

   2. Compton effect

   
   
   

   3. Theory of relativity

   
   
   

   4. None of these

   
   
   

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   Photoelectric effect

   Correct Option: A

   Photoelectric effect

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2. A body traveling with a speed of more than the velocity of sound in air is said to travel with

1. 1. supersonic speed

   
   
   

   2. hypersonic speed

   
   
   

   3. ultrasonic speed

   
   
   

   4. infrasonic speed

   
   
   

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   supersonic speed

   Correct Option: A

   supersonic speed

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3. The special technique used in ships to calculate the depth of ocean beds is

1. 1. LASER

   
   
   

   2. SONAR

   
   
   

   3. sonic boom

   
   
   

   4. reverberation

   
   
   

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   SONAR

   Correct Option: B

   SONAR

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4. Solar energy is produced by the following reaction

1. 1. Fission reaction

   
   
   

   2. Fusion reaction

   
   
   

   3. Chemical reaction

   
   
   

   4. None of these

   
   
   

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   Fusion reaction

   Correct Option: B

   Fusion reaction

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5. The number of electrons in an atom of atomic number Z and mass number A is

1. 1. Z

   
   
   

   2. A

   
   
   

   3. A - Z

   
   
   

   4. none

   
   
   

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   NA

   Correct Option: A

   NA

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