JEE Main PYQs on Sound: JEE Main Questions for Practice with Solutions

JEE Main Questions

• 1.

  An AC current is represented as: $ i = 5\sqrt{2} + 10 \cos\left(650\pi t + \frac{\pi}{6}\right) \text{ Amp} $ The RMS value of the current is:

  • 50 Amp
  • 100 Amp
  • 10 Amp
  • \( 5\sqrt{2} \) Amp
    
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• 2.

  Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). 
  Assertion (A) : If Young’s double slit experiment is performed in an optically denser medium than air, then the consecutive fringes come closer. 
  Reason (R) : The speed of light reduces in an optically denser medium than air while its frequency does not change. 
  In the light of the above statements, choose the most appropriate answer from the options given below :

  • Both (A) and (R) are true and (R) is the correct explanation of (A)
    
  • (A) is false but (R) is true.
    
  • Both (A) and (R) are true but (R) is not the correct explanation of (A)
    
  • (A) is true but (R) is false.
    
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• 3.

  The velocity-time graph of an object moving along a straight line is shown in the figure. What is the distance covered by the object between \( t = 0 \) to \( t = 4s \)? 
  
  
   

  • 13 m
    
  • 30 m
    
  • 11 m
    
  • 10 m
    
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• 4.

  The value of current \( I \) in the electrical circuit as given below, when the potential at \( A \) is equal to the potential at \( B \), will be ________________________ A.
  

  

  • \( 1.0 \)
    
  • \( 2.0 \)
    
  • \( 0.5 \)
    
  • \( 4.0 \)
    
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• 5.

  The ratio of the power of a light source \( S_1 \) to that of the light source \( S_2 \) is 2. \( S_1 \) is emitting \( 2 \times 10^{15} \) photons per second at 600 nm. If the wavelength of the source \( S_2 \) is 300 nm, then the number of photons per second emitted by \( S_2 \) is \_\_\_\_\_ \( \times 10^{14} \).

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• 6.

  A body of mass \(4\) kg is placed at a point \(P\) having coordinates \( (3,4) \) m. Under the action of force \( \mathbf{F} = (2\hat{i} + 3\hat{j}) \) N, it moves to a new point \(Q\) having coordinates \( (6,10) \) m in \(4\) sec. The average power and instantaneous power at the end of \(4\) sec are in the ratio:

  • \( 1:2 \)
    
  • \( 6:13 \)
    
  • \( 4:3 \)
    
  • \( 13:6 \)
    
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