Microphones

Q.

How microphone and loudspeaker are related to each other?

1. Both microphone and loud speaker converts electrical energy into sound energy.

2. A microphone converts electrical energy into sound energy and a loud speaker converts sound energy into electrical energy.

3. A microphone converts sound energy into electrical energy and a loud speaker converts electrical energy into sound energy.

4. Both microphone and loudspeaker converts sound energy into electrical energy.

Q.

Why is magnet placed in a speaker

Q. When a body of mass 25 kg is suspended from a sonometre wire then it vibrates with frequency 200 hertz. If the volume of the body is 0.009 metre cube and it is immersed in water then the frequency of vibration of the wire will be-

Q.

List out a few applications of a microphone in our day-to-day life.

1. In telephones

2. In tape recorders

3. In AC generators

4. In hearing aids

Q. Sort the following according to the function of a microphone.

1. Sound is produced.
2. Propagates through air.
3. Diaphragm vibrates and coil oscillates.
4. Electrical energy is produced.

Q.

In a moving coil microphone electric signals are generated___.

1. due to sound waves falling on it

2. due to internal electric field in which the voice coil is placed

3. due to external electric field in which the voice coil is placed

4. due to external electromagnetic waves

Q. How to find the frequency of waves generated by a open organ pipe, closed organ pipe, sonometer and resonance tube?

Q.

Which of the following are the types of microphones used in day to day life?

1. Carbon microphones

2. Ribbon microphones

3. Capacitor microphones

4. Crystal and ceramic microphones

Q. Name the instrument which converts sound energy into electric energy.

1. Loudspeaker
2. Microphone
3. Dynamo
4. None

Q. Which of the following transformations of energy takes place in a microphone?

1. Mechanical energy into sound
2. Sound into electrical energy
3. Electrical energy into sound
4. Sound into mechanical energy

Q.

___ microphone uses the phenomenon of piezoelectric effect to convert the vibrations into an electrical signal.

1. Capacitor

2. Carbon

3. Ribbon

4. Crystal and ceramic

Q. Why is the output signal of a moving coil microphone sent to the loudspeaker only after feeding it directly into an amplifier ?

Q. Why is it difficult some times to recognize your friend's voice on phone?

Q. What does a radio wave do to the charges in the receiving antenna to provide a signal for your car radio?