- Light year is the :
- Earth is divided into following three layers?
- Day and night changes due to:
- Sun rises in the east and sets in the west due to the
- Max Plank discovered?
- Max plank discovered
- The cold and dense air blowing down the mountain slope during the night is known as:
- Which of the following is associated with Einstein?
- Which is the hardest among following?
- Which substance is found in site the cavity of bones ?