Velocity of sound in air does not change with the change of
1). Temperature of air
2). Pressure of air
3). Moisture content in air
4). Wind in the direction of propagation of sound
1. The mercury and sodium street lamps light up because of.
2. If the vector sum of torques acting on a system is zero, then the object is in _______.
3. If the spinning speed of the earth is increased then the weight of body at the equator
4. The sky appears blue because of
6. A device used for converting A.C. into D.C. is called
8. Instrument for measuring rainfall is called