Step 1: Understanding the Concept:
Large dams like the Tehri Dam are typically constructed as multi-purpose projects, meaning they are designed to serve several functions simultaneously.
Step 2: Detailed Explanation:
The Tehri Dam, built on the Bhagirathi River in Uttarakhand, was constructed with multiple objectives in mind:
\[\begin{array}{rl} \bullet & \text{Electricity generation: It has a large hydroelectric power plant to generate electricity.} \\ \bullet & \text{Land irrigation: It provides water for the irrigation of large agricultural areas in Uttar Pradesh and Uttarakhand.} \\ \bullet & \text{Water supply: It supplies drinking water to several urban areas, including Delhi.} \\ \end{array}\]
Since the dam serves all the purposes listed in the options, the correct answer is "All of these".
Step 3: Final Answer:
The objectives for the construction of the Tehri Dam include electricity generation, land irrigation, and water supply.