Practice authentic previous years' questions for Physics, Chemistry, Botany, and Zoology with step-by-step NCERT-aligned solutions and full-width diagram references.
Marking pattern: +4.00 positive, -1.00 negative (Official NTA NEET Scheme).
A wire of uniform cross-section and resistance $R = 16\ \Omega$ is bent into the shape of a complete circle. What is the effective electrical resistance between two diametrically opposite points $A$ and $B$ on the circle?
If a double-stranded $\text{DNA}$ molecule has $20\%$ of its total nitrogenous bases as Cytosine, what is the percentage of Adenine present in this $\text{DNA}$ molecule according to Chargaff's rules?