WBJEE 2021 Question Paper with Solution PDFs Available- Download Here

WBJEE 2021 Questions

• 1.

  Figure shows the graph of angle of deviation \( \delta \) versus angle of incidence \( i \) for a light ray striking a prism. The prism angle is

  

  • \( 30^\circ \)
  • \( 60^\circ \)
  • \( 75^\circ \)
  • \( 90^\circ \)
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• 2.

  Ruma reached the metro station and found that the escalator was not working. She walked up the stationary escalator with velocity \( v_1 \) in time \( t_1 \). On another day, if she remains stationary on the escalator moving with velocity \( v_2 \), the escalator takes her up in time \( t_2 \). The time taken by her to walk up with velocity \( v_1 \) on the moving escalator will be:

  • \( \frac{t_1}{t_2} \)
  • \( \frac{t_1 + t_2}{t_2 - t_1} \)
  • \( \frac{t_1 + t_2}{v_1 + v_2} \)
  • \( \frac{t_1 t_2}{t_1 + t_2} \)
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• 3.

  The compound(s) showing optical activity is/are

  • 

  • 

  • 

  • 

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• 4.

  Which of the following statement(s) is/are correct about the given compound?
  

  • It exhibits tautomerism.
    
  • It does not react with metallic sodium.
    
  • It gives reddish-violet coloration with FeCl$_3$ solution.
    
  • It gives precipitate with 2,4-dinitrophenyl hydrazine solution.
    
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• 5.

  X is an extensive property and x is an intensive property of a thermodynamic system. Which of the following statement(s) is (are) correct?

  • xX is extensive.
  • $\frac{x}{X}$ is intensive.
    
  • $\frac{X}{x}$ is extensive.
  • $\frac{dX}{dx}$ is intensive.
    
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