Ozone hole is caused by chemicals like _____.
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Which of the following is the cleanest source of energy?
Exobiology refers to
Who discovered Pluto?
Brain fever is a disease spread through which of the following?
Bridgmanite is
India has designed and developed pilotless target aircrafts named ___ and made successful test flight of its unmanned air vehicle (UAV).
1. Nishant
2. Lakshya
3. Astra
American astronaut Scott Joseph Kelly commanded the International Space Station Consecutively for 340 days on ___.