WBJEE 2023 Physics Question Paper with Answer Key PDF Download

WBJEE 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 

  

  • \( 30^\circ \)
    
  • \( 45^\circ \)
    
  • \( 60^\circ \)
    
  • \( 75^\circ \)
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• 2.

  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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• 3.

  Three different liquids are filled in a U-tube as shown. Their densities are \( \rho_1, \rho_2, \rho_3 \) respectively. From the figure we may conclude that 
  

  • \( \rho_3 = 4(\rho_2 - \rho_1) \)
    
  • \( \rho_3 = 4(\rho_1 - \rho_2) \)
    
  • \( \rho_3 = 2(\rho_2 - \rho_1) \)
    
  • \( \rho_3 = \frac{\rho_1+\rho_2}{2} \)
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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.

  A diode is connected in parallel with a resistance as shown in the figure. The most probable current (I)–voltage (V) characteristic is 
  

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

  Two charges \( +q \) and \( -q \) are placed at points \( A \) and \( B \) respectively which are at a distance \( 2L \) apart. \( C \) is the midpoint of \( AB \). The work done in moving a charge \( +Q \) along the semicircle CSD (\( W_1 \)) and along the line CBD (\( W_2 \)) are 
  

  • \( -\frac{qQ}{6\pi\varepsilon_0 L},\; \frac{qQ}{6\pi\varepsilon_0 L} \)
    
  • \( \frac{qQ}{4\pi\varepsilon_0 L},\; -\frac{qQ}{4\pi\varepsilon_0 L} \)
    
  • \( -\frac{qQ}{6\pi\varepsilon_0 L},\; -\frac{qQ}{12\pi\varepsilon_0 L} \)
    
  • \( \frac{qQ}{4\pi\varepsilon_0 L},\; 0 \)
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