Non-conventional sources of energy, such as solar, wind, and biomass, are significant for the following reasons:
• Renewable and Sustainable: Unlike coal and petroleum, non-conventional energy sources are renewable and can be used indefinitely. For example, solar power in Rajasthan.
• Environmentally Friendly: They produce minimal pollution and help combat climate change. Wind farms in Tamil Nadu generate clean energy.
• Energy Security: Reduces dependency on imported fossil fuels, strengthening energy security. For instance, India’s focus on solar energy reduces oil imports.
• Cost-Effective: Technological advancements have made renewable energy cost-efficient in the long run.
| $Pair$ | $Category$ |
|---|---|
| Ferrous | Natural Gas |
| Non-Ferrous | Nickel |
| Non-Metallic Minerals | Limestone |
| Energy Minerals | Cobalt |
Match Column-I with Column-II and choose the correct option:
| Column-I (Minerals) | Column-II (Features) | ||
|---|---|---|---|
| A. | Copper | (i) | Used in manufacturing of steel and plants |
| B. | Bauxite | (ii) | Used in electric and electronic industries |
| C. | Mica | (iii) | Used in electric cables and utensils |
| D. | Manganese | (iv) | Used in aluminium production |
Choose the correct answer from the options given below:
| Case No. | Lens | Focal Length | Object Distance |
|---|---|---|---|
| 1 | \(A\) | 50 cm | 25 cm |
| 2 | B | 20 cm | 60 cm |
| 3 | C | 15 cm | 30 cm |