MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Identify the type of modulation where the modulating wave is superimposed on a high-frequency carrier wave. |
| A. | Phase modulation |
| B. | Amplitude modulation |
| C. | Frequency modulation |
| D. | Wavelength modulation |
| Answer» C. Frequency modulation | |
| 2. |
Suggest a possible communication channel for the transmission of a message signal that has a bandwidth of 200kHz. |
| A. | TV transmission |
| B. | Optical fiber |
| C. | AM radio |
| D. | FM radio |
| Answer» E. | |
| 3. |
How can the noise be reduced in AM signal? |
| A. | Increasing amplitude |
| B. | Increasing wavelength |
| C. | Increasing bandwidth |
| D. | Increasing frequency deviation |
| Answer» E. | |
| 4. |
‘X’ for an AM is the ratio of change in amplitude of the carrier wave to the amplitude of the original carrier wave. Identify ‘X’. |
| A. | Automatic gain control |
| B. | Modulation index |
| C. | Phase index |
| D. | Amplitude index |
| Answer» C. Phase index | |
| 5. |
PAM stands for pulse attenuation modulation. |
| A. | True |
| B. | False |
| Answer» C. | |
| 6. |
A carrier of peak voltage 15 V is used to transmit a message signal. If the modulation index is 70%, then what will be the peak voltage of the modulating signal? |
| A. | 25 V |
| B. | 11 V |
| C. | 10.5 V |
| D. | 30 V |
| Answer» D. 30 V | |
| 7. |
Of the following which is the preferred modulation scheme for digital communication? |
| A. | Pulse code modulation |
| B. | Pulse amplitude modulation |
| C. | Pulse position modulation |
| D. | Pulse width modulation |
| Answer» B. Pulse amplitude modulation | |
| 8. |
Why is AM used for broadcasting in the communication systems? |
| A. | Its use avoids receiver complexity |
| B. | It is more immune to other modulation systems |
| C. | It requires less transmitting power |
| D. | No noise disturbances |
| Answer» B. It is more immune to other modulation systems | |
| 9. |
What does AGC stand for? |
| A. | Automatic gain control |
| B. | Automatic gear control |
| C. | Amplitude gain control |
| D. | Automotive gear center |
| Answer» B. Automatic gear control | |
| 10. |
Identify the type of modulation where the frequency of the modulated wave is equal to that of the carrier wave. |
| A. | Frequency modulation |
| B. | Amplitude modulation |
| C. | Carrier modulation |
| D. | Phase modulation |
| Answer» C. Carrier modulation | |