1. Which is the highest Plateau ?

Answer: Pamir, Tibet

2. 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.

3. Which is the largest Mosque in India ?

Answer: Jama Masjid (Delhi)

4. Which is the lightest gas ?

Answer: Hydrogen

5. Which is Longest Dam in India ?

Answer: Hirakod Dam (Orissa)

6. Which is largest Creature in world ?

Answer: Blue Whale

7. Which is the highest dam in India ?

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