_____ is the rigid top layer of the Earth.
1). Atmosphere
2). Hydrosphere
3). Biosphere
4). Lithosphere
2. 'Ace against Odds' is an autobiography of which sports person?
5. Book 'Indian Army Vision 2020' is written by
6. Which regional division the Himalayas is situated between the Kali and Tista rivers?
7. At which of the following place, the weight of an object is maximum?
8. The angle between the __________ and the incident ray is called the angle of incidence.