Who invented the mobile phone?
1). Raymond Samuel Tomlinson
2). Marlin Cooper?
3). Chuck Hull?
4). Tim Berners ? Lee
For television broadcasting the frequency employed is normally
1). 30 ? 300 MHz
2). 30 ? 300 GHz
3). 30 ? 300 kHz?
4). 30 ? 300 Hz?
A digita signal:?
1). is less reliable than analog signal?
2). is more reliable than analog signal
3). is equally reliable as the analog signa
4). None of the above?
?A digital signal possesses:
1). Continuously varying values
2). only two discrete values
3). Only four discrete values
4). None of the above
?A diode as a rectifier converts?
1). Ac to dc?
2). dc to ac?
3). Varying dc into constant dc
4). High voltage into low voltage and vice-versa