WBJEE 2023 Chemistry Question Paper with Answer Key PDF Download

WBJEE Questions

• 1.

  Which logic gate is represented by the following combinations of logic gates?
  

  • NAND
    
  • AND
    
  • NOR
    
  • OR
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• 2.

  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 

  

  • \( 30^\circ \)
    
  • \( 45^\circ \)
    
  • \( 60^\circ \)
    
  • \( 75^\circ \)
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• 3.

  The variation of density of a solid cylindrical rod of cross-sectional area \( a \) and length \( L \) is \( \rho=\rho_0 \frac{x^2}{L^2} \), where \( x \) is the distance from one end. The position of its centre of mass from \( x=0 \) is 
  

  • \( \frac{2L}{3} \)
    
  • \( \frac{L}{2} \)
    
  • \( \frac{L}{3} \)
    
  • \( \frac{3L}{4} \)
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• 4.

  Manufacturers supply a zener diode with zener voltage \( V_z=5.6\,\text{V} \) and maximum power dissipation \( P_{\max}=\frac14\,\text{W} \). This zener diode is used in the circuit shown. Calculate the minimum value of the resistance \( R_s \) so that the zener diode will not burn when the input voltage is \( V_{in}=10\,\text{V} \). 
  

  • \( 98.56\,\Omega \)
    
  • \( 170.52\,\Omega \)
    
  • \( 306.21\,\Omega \)
    
  • \( 412.37\,\Omega \)
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• 5.

  The number of undecayed nuclei \( N \) in a sample of radioactive material as a function of time \( t \) is shown in the figure. Which of the following graphs correctly shows the relationship between \( N \) and the activity \( A \)? 
  

  • Option a
    
  • Option b
    
  • Option c
    
  • Option d
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• 6.

  The velocity-time graph for a body of mass \( 10\,\text{kg} \) is shown. Work done on the body in the first two seconds of motion is 
  

  • \( -9300\,\text{J} \)
    
  • \( 12000\,\text{J} \)
    
  • \( -4500\,\text{J} \)
    
  • \( -12000\,\text{J} \)
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