The loudness of sound depends upon
1). velocity
2). ?pitch
3). amplitude
4). wavelength?
1. The device used for locating submerged objects under sea is.
2. Which one of the following is a good electrical conductor?
3. Light from Sun reaches Earth in approximately
4. A star appears twinkling in the sky because of
6. Which of the following events occurred first ?
7. Energy is continuously created in the sun due to:
8. Energy travels from Sun to Earth through
10. Why do birds not have respiratory trouble at the time of flying at high altitude ?