MCQOPTIONS
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MCQOPTIONS
This section includes 9 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
What happens in frequency modulation? |
| A. | The amplitude of the modulated wave varies as the frequency of the carrier wave |
| B. | The frequency of the modulated wave varies as the amplitude of the modulating wave |
| C. | The amplitude of the modulated wave varies as the amplitude of the carrier wave |
| D. | The frequency of modulated wave varies as the frequency of modulating wave |
| Answer» C. The amplitude of the modulated wave varies as the amplitude of the carrier wave | |
| 2. |
What is the maximum distance up to which a TV transmission can be received if the TV tower has a height of 50 m? |
| A. | 28284 km |
| B. | 20.8 km |
| C. | 28.2 km |
| D. | 45 km |
| Answer» D. 45 km | |
| 3. |
If the highest modulating frequency of the wave is 10 kHz, what is the number of stations that can be accommodated in a bandwidth of 200 kHz? |
| A. | 10 |
| B. | 20 |
| C. | 5 |
| D. | 15 |
| Answer» B. 20 | |
| 4. |
Modulation is a process of the superposing high-frequency audio signal on low-frequency radiowaves. |
| A. | True |
| B. | False |
| Answer» C. | |
| 5. |
An oscillator is producing FM waves of frequency 5 kHz with a variation of 15 kHz. What is the modulation index? |
| A. | 1.00 |
| B. | 3.00 |
| C. | 0.5 |
| D. | 5.00 |
| Answer» C. 0.5 | |
| 6. |
What happens in a frequency modulated wave? |
| A. | Frequency varies with time |
| B. | Amplitude varies with time |
| C. | Both frequency and amplitude varies with time |
| D. | Both frequency and amplitude are constant |
| Answer» B. Amplitude varies with time | |
| 7. |
Why audio signals cannot be transmitted directly? |
| A. | The signal has more noise |
| B. | The signal cannot be amplified for distance communication |
| C. | The transmitting antenna length is very small to design |
| D. | The transmitting antenna length is very large and impracticable |
| Answer» E. | |
| 8. |
Identify the limitation of amplitude modification. |
| A. | The quality of the audio signal is high |
| B. | Amplitude modulation suffers from noise |
| C. | The efficiency of AM transmission is high |
| D. | It does not require a wider channel |
| Answer» C. The efficiency of AM transmission is high | |
| 9. |
What is the modulation used to? |
| A. | Reduce the bandwidth used |
| B. | Separate the transmissions of different users |
| C. | Ensure that intelligence may be transmitted to long distances |
| D. | Allow the use of practical antennas |
| Answer» B. Separate the transmissions of different users | |