Sound travel fastest in
1). steel
2). air?
3). water
4). vaccum
1. Increased wind speed is accompanied by a reduced air ________
3. Global warming is expected to result in
5. The bats can fly in the dark because
6. Who invented the mobile phone?
7. ?If there were no atmosphere, the length of the day on the earth will
8. In which of the following cases, kinetic energy is being used in performing work ?
9. What is viewed through an electron microscope
10. The concept of 'Carban credit' originated from which one of the following?