Dams MCQ with answer and solution

Concept

Dharoi Dam Characteristics

Formula

N/A

Step-by-step solution

1. Evaluate Statement 1: Dharoi Dam is a composite structure with a masonry spillway and earthen flanks. 2. Evaluate Statements 2 and 3: It supplies drinking water to Ahmedabad and Gandhinagar, and its catchment is in the Aravalli hills. 3. Conclude that all three statements are correct, selecting Option (d).

Explanation

All three statements are correct: - Statement 1 is correct because Dharoi Dam is a composite structure featuring a central masonry/concrete spillway flanked by earthen embankments. - Statement 2 is correct as the dam supplies drinking water through pipelines to major cities like Ahmedabad and Gandhinagar. - Statement 3 is correct because the Sabarmati River catchment primarily drains the southern Aravalli range in Rajasthan.Therefore, Option D (1, 2 and 3) is the correct answer.

Shortcut

To remember key facts about the Dharoi Dam, use the mnemonic "D-C-W-R" (Dharoi Composite Water Rajasthan): - Composite structure: Central masonry spillway with earthen flanks - Water supply: Primary drinking water source for Ahmedabad and Gandhinagar - Rajasthan catchment: Drains the Aravalli hills of Rajasthan where Sabarmati originates

Common mistake

A common mistake is selecting Option A or B by incorrectly assuming that Statement 3 is false, believing the Dharoi Dam catchment lies entirely within Gujarat because the dam itself is located in Gujarat, while overlooking that the Sabarmati River originates and collects significant catchment in the Aravalli range of Rajasthan. Another frequent mistake is assuming the dam is purely earthen or purely concrete, leading students to eliminate Statement 1.