Mulitple Choice Questions

The working of the receiver of a telephone depends upon the _____.

1. Efficiency of the loudspeaker which enhances the loudness of sound
2. Diaphragm which is made to vibrate by the incoming sound wave
3. Change in magnetization of an electromagnet, which causes a diaphragm to vibrate
4. Conversion of electric signal, after its amplification into sound wave

Topic-Wise MCQs on Sciences