Consider the following statements about the microphone and the speaker of a mobile phone : 1. The microphone converts sound to a mechanical signal. 2. The microphone converts sound to an electrical signal. 3. The speaker converts a mechanical signal to sound. 4. The speaker converts an electrical signal to sound. Which of the statements given above are correct?

Which one of the following statements about sound is NOT correct?

Which one of the following statements about the speed of sound waves is not correct?

With reference to sound waves, consider the following statements: 1. Sound waves do not need any medium and can travel in vacuum also. 2. Sound waves are longitudinal waves. 3. In sound wave propagat…

Consider the following statements regarding waves: 1. If the particles of a medium move along the direction of motion of the wave, the wave is called a longitudinal wave. 2. If the particles of a med…

Two astronauts on the moon are standing 10 m apart. Astronaut A shouts toward Astronaut B and simultaneously flashes a light signal. Which of the following statements is correct?