Q1: Material having maximum density is

ANS:B - osmium

The material with the maximum density among the options provided is osmium. Explanation:

1. Density: Density is a measure of mass per unit volume. In the context of materials, it indicates how much mass is contained in a given volume. The material with the highest density has the most mass packed into a specific volume.
2. Osmium: Osmium is a chemical element with the symbol Os and atomic number 76. It is a hard, brittle, blue-gray or blue-black transition metal in the platinum group. Osmium is one of the densest naturally occurring elements, with a density of approximately 22.59 grams per cubic centimeter (g/cm³) at room temperature and pressure.
3. Comparison with Other Materials:
   • Plutonium: Plutonium is a radioactive chemical element with the symbol Pu and atomic number 94. It is a dense metal, but its density is lower than that of osmium. Plutonium typically has a density of around 19.86 g/cm³.
   • Titanium: Titanium is a chemical element with the symbol Ti and atomic number 22. It is a lightweight, strong, and corrosion-resistant metal, but its density is significantly lower than that of osmium. Titanium has a density of approximately 4.506 g/cm³.
   • Uranium: Uranium is a chemical element with the symbol U and atomic number 92. Like plutonium, uranium is a dense metal, but its density is also lower than that of osmium. Uranium typically has a density of about 19.05 g/cm³.
4. Conclusion: Among the options provided, osmium has the highest density, making it the material with the maximum density. Its dense atomic structure contributes to its high density, making it one of the densest naturally occurring elements.