1. Which is smallest state by area of India ?

Answer: Goa

2. Which is largest Dam in World ?

Answer: Three Gorges (China)

3. Which is longest river of India

Answer: Ganges

4. Which is the highest dam in India ?

Answer: Tehri Dam on Bhagirathi River in Uttarakhand (Height of 260 metres)

5. Which is the shortest day in the year ?

Answer: December 22

6. Which is Longest Dam in India ?

Answer: Hirakod Dam (Orissa)

7. Which is highest dam in world ?

Answer:

Jinping-I Dam - 305 m (1,001 ft) in China on Yalong river.
Second Highest is Nurek Dam 300 m (980 ft) Tajikistan on Vakhsh river.