Radio and TV Communication

1. What is the primary meaning of communication?

a) Only receiving data

b) Sending and receiving of information ✓

c) Storing signals in a database

d) Increasing signal amplitude

2. In a basic communication system, what is the purpose of the transmitter?

a) To receive message signals

b) To transmit data from a source ✓

c) To act as a communication medium

d) To convert light into sound

3. Which type of communication uses sine waves to represent information signals?

a) Analog communication ✓

b) Digital communication

c) Binary communication

d) Logic-based communication

4. Digital communication is characterized by the transfer of signals represented by _____?

a) Sine waves

b) Square waves ✓

c) Triangular waves

d) Sawtooth waves

5. Modulation is the process of superimposing a low-frequency message signal onto a _____?

a) Low-frequency noise wave

b) High-frequency carrier wave ✓

c) Digital square wave

d) Grounded signal

6. One reason modulation is necessary is to _____?

a) Increase the height of an antenna

b) Reduce the height of the antenna ✓

c) Decrease the range of transmission

d) Mix multiple signals together

7. In Amplitude Modulation (AM), what remains constant?

a) Carrier amplitude

b) Carrier frequency ✓

c) Signal phase

d) Message amplitude

8. In Frequency Modulation (FM), which property of the carrier wave is varied?

a) Amplitude

b) Frequency ✓

c) Phase

d) Voltage

9. The process of extracting the message signal from the modulated carrier wave is called _____?

a) Modulation

b) Demodulation ✓

c) Amplification

d) Oscillation

10. Human ears can respond to audio frequencies in the range of _____?

a) 1 Hz to 100 Hz

b) 20 Hz to 20 KHz ✓

c) 455 KHz to 10.7 MHz

d) 20 KHz to 20 MHz

11. Radio communication is defined as communication using _____?

a) Wired cables

b) Radio Frequency (RF) waves ✓

c) Light waves only

d) Ultrasonic waves

12. In a Radio Transmitter, which component converts sound waves into audio signals?

a) Microphone ✓

b) Carrier Oscillator

c) Modulator

d) Antenna

13. What is the standard Intermediate Frequency (IF) for an AM radio receiver?

a) 10.7 MHz

b) 455 KHz ✓

c) 20 KHz

d) 100 MHz

14. In a Radio Receiver, the loud speaker converts amplified audio signals into _____?

a) Electrical signals

b) Sound waves ✓

c) Electromagnetic waves

d) Light waves

15. Television communication is often described as _____?

a) Sound without data

b) Radio with Pictures ✓

c) Wired video only

d) Digital audio only

16. In a TV Transmitter, picture signals are typically _____ modulated.

a) Frequency

b) Amplitude ✓

c) Phase

d) Binary

17. Which component in a TV receiver converts video signals into light (pictures)?

a) Video Detector

b) Monitor ✓

c) Video Amplifier

d) RF Section

18. The first video display technology used in TV and computer monitors was _____?

a) LCD

b) CRT (Cathode Ray Tube) ✓

c) LED

d) OLED

19. An LED TV is actually an LCD display that uses _____ for backlighting.

a) Fluorescent lamps

b) Light Emitting Diodes (LEDs) ✓

c) Plasma cells

d) Quantum dots

20. Which TV technology uses tiny particles that emit light and colors when hit by background light?

a) OLED

b) QLED ✓

c) Plasma

d) CRT