A motor converts
1). mechanical energy into electrical energy
2). ?mechanical energy into sound energy?
3). ?electrical energy into mechanical energy
4). None of these
2. Why does bleeding occur through the nose in high mountainous regions ?
3. Intensity of gravitational field of earth is maximum at
4. Which of the following experiments analyzed the Fraunhofer lines of the solar spectrum?
7. Which rays cause skin damage?
8. The distance between node and adjacent antinodes is 30 cm. The wavelength is