List of top Questions asked in Bihar Board Class XII

Find the product of the matrices: \[ \left[ \begin{matrix} 6 & 5 \end{matrix} \right] \left[ \begin{matrix} -1 \\ 1 \end{matrix} \right] \] 

Multiply the matrices: \[ \left[ \begin{matrix} 1 & 2 \\ 3 & 4 \end{matrix} \right] \left[ \begin{matrix} 4 & 0 \\ 0 & 4 \end{matrix} \right] \]
Multiply the matrices: \[ \left[ \begin{matrix} 2 & 5 \\ 3 & 7 \end{matrix} \right] \left[ \begin{matrix} 2 & 5 \end{matrix} \right] \] \\
Find the product of the matrices: \[ \left[ \begin{matrix} 3 & -2 \\ -1 & -1 \end{matrix} \right] \]
Multiply the matrix: \[ \left[ \begin{matrix} 4 & -2 \\ \end{matrix} \right] \] \[ \left[ \begin{matrix} -1 \\ -1 \end{matrix} \right] \]
Find the adjoint of the matrix: \[ \left[ \begin{matrix} 2 & 3 \\ 5 & 4 \end{matrix} \right] \]

Which of the following is a functionally complete set of gates ? 
(i) NAND 
(ii) NOT

Describe the process of sex-determination in honeybees.
Present a well-labelled neat and clean diagram of recombinant technology.
Describe biofortification in brief.
What is the importance of Red Data Book?
Write any two differences between integument and testa.
Explain any two differences between c-DNA and s-DNA.
What is epistasis?
What do you understand by ground water? Describe the causes for its depletion and remedies.
Explain the differences between any two of the following: (a) Food chain and food web
Present a neat, clean, and well-labelled diagram of an embryo inside the human uterus.
Write any two symptoms of sickle cell anaemia.
What are sacred groves?
Define commensalism and write two examples.
What are pathogens? Write the names of any one plant and one animal pathogen.
Define germplasm.
What is gene library?
Mention any two harmful effects of sewage.
What is mycorrhiza?