WBJEE 2026 Question Paper: Download Answer Key with Solutions PDF

WBJEE 2026 Questions

• 1.

  Which one among the following compounds will most readily be dehydrated under acidic condition? 

  

  • Option a
    
  • Option b
    
  • Option c
    
  • Option d
  View Solution

  ---

• 2.

  What are the charges stored in the \( 1\,\mu\text{F} \) and \( 2\,\mu\text{F} \) capacitors in the circuit once current becomes steady? 
  

  • \( 8\,\mu C \) and \( 4\,\mu C \)
    
  • \( 4\,\mu C \) and \( 8\,\mu C \)
    
  • \( 3\,\mu C \) and \( 6\,\mu C \)
    
  • \( 6\,\mu C \) and \( 3\,\mu C \)
  View Solution

  ---

• 3.

  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 \( V_{in}=10\,\text{V} \). 
  

  • \( 98.56\,\Omega \)
    
  • \( 170.52\,\Omega \)
    
  • \( 306.21\,\Omega \)
    
  • \( 412.37\,\Omega \)
  View Solution

  ---

• 4.

  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 
  

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

  ---

• 5.

  A piece of granite floats at the interface of mercury and water. If the densities of granite, water and mercury are \( \rho, \rho_1, \rho_2 \) respectively, the ratio of volume of granite in water to that in mercury is 
  

  • \( \frac{\rho_2 - \rho}{\rho - \rho_1} \)
    
  • \( \frac{\rho_2 + \rho}{\rho_1 + \rho} \)
    
  • \( \frac{\rho_1\rho_2}{\rho} \)
    
  • \( \frac{\rho_1}{\rho_2} \)
  View Solution