McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Uncategorized topics .
Chapters
| 1. |
As compared to sound waves the frequency of radio waves is |
| A. | lower |
| B. | higher |
| C. | equal |
| D. | may be higher or lower |
| Answer» B. higher | |
| 2. |
Decrease in strength of signal is known as |
| A. | tuning |
| B. | modulation |
| C. | attenuation |
| D. | amplification |
| Answer» C. attenuation | |
| 3. |
If frequency of modulated wave is less than frequency of carrier wave, then input signal is |
| A. | negative |
| B. | positive |
| C. | zero |
| D. | infinite |
| Answer» A. negative | |
| 4. |
At the end of communication system, the signal is converted from radio to |
| A. | sound |
| B. | mechanical energy |
| C. | kinetic energy |
| D. | potential energy |
| Answer» A. sound | |
| 5. |
Energy is lost in wires due to |
| A. | heating |
| B. | resistance |
| C. | conduction |
| D. | both A and B |
| Answer» D. both A and B | |
| 6. |
Voltage signal generated by a microphone is |
| A. | digital in nature |
| B. | analogue in nature |
| C. | consists of bits and bytes |
| D. | hybrid in nature |
| Answer» B. analogue in nature | |
| 7. |
Phenomena in which signal transmitted in one circuit creates undesired effect in other circuit is known as |
| A. | crosstalk |
| B. | signal attenuation |
| C. | sampling |
| D. | crosslinking |
| Answer» D. crosslinking | |
| 8. |
Digital number 9 can be represented in binary number as |
| A. | 110 |
| B. | 1001 |
| C. | 1010 |
| D. | 1011 |
| Answer» B. 1001 | |
| 9. |
Geostationary satellite has period |
| A. | twice of Earth |
| B. | same as Earth |
| C. | half of Earth |
| D. | quarter of Earth |
| Answer» B. same as Earth | |
| 10. |
Bit on left hand side has |
| A. | lowest value |
| B. | zero value |
| C. | highest value |
| D. | infinite value |
| Answer» C. highest value | |
| 11. |
A digital quantity has |
| A. | only 2 values |
| B. | more than 2 values |
| C. | no values |
| D. | less than 2 values |
| Answer» A. only 2 values | |
| 12. |
Frequency of sky waves is |
| A. | less then 3 MHz |
| B. | more than 3 MHz |
| C. | less than 2 MHz |
| D. | exactly 2 MHz |
| Answer» B. more than 3 MHz | |
| 13. |
Each digit in a binary number is known as a |
| A. | bit |
| B. | byte |
| C. | number |
| D. | digit |
| Answer» A. bit | |
| 14. |
Value of sampled signal is used to produce a |
| A. | binary number |
| B. | decimal number |
| C. | octal number |
| D. | all of above |
| Answer» A. binary number | |
| 15. |
Data in compact disc is stored in form of |
| A. | analogue signal |
| B. | digital signal |
| C. | noise |
| D. | colors |
| Answer» B. digital signal | |
| 16. |
With a 30 m long coaxial cable, the bandwidth can exceed |
| A. | 100 MHz |
| B. | 1000 MHz |
| C. | 50 MHz |
| D. | 300 MHz |
| Answer» A. 100 MHz | |
| 17. |
Amplitude of modulated wave is in phase with |
| A. | output |
| B. | system |
| C. | frequency |
| D. | signal |
| Answer» D. signal | |
| 18. |
Variation in amplitude or frequency of carrier wave is called |
| A. | amplitude modulation |
| B. | frequency modulation |
| C. | modulation |
| D. | bandwidth |
| Answer» C. modulation | |
| 19. |
In frequency modulation, amplitude of modulated wave is |
| A. | positive |
| B. | negative |
| C. | constant |
| D. | zero |
| Answer» C. constant | |
| 20. |
High quality music only needs frequencies up to |
| A. | 10 Hz |
| B. | 15 Hz |
| C. | 20 kHz |
| D. | 15 kHz |
| Answer» D. 15 kHz | |
| 21. |
Binary system has base |
| A. | 10 |
| B. | 11 |
| C. | 1 |
| D. | 2 |
| Answer» D. 2 | |
| 22. |
In FM, frequency of modulated wave varies with |
| A. | amplitude |
| B. | time |
| C. | wavelength |
| D. | energy |
| Answer» B. time | |
| 23. |
Unwanted signal that distorts a transmitted signal is called |
| A. | analogue |
| B. | noise |
| C. | digital |
| D. | tuning |
| Answer» B. noise | |
| 24. |
First communication satellites used frequencies of |
| A. | 6 GHz for uplink |
| B. | 3 GHz for uplink |
| C. | 6 GHz for downlink |
| D. | 5 GHz for downlink |
| Answer» A. 6 GHz for uplink | |
| 25. |
A wave of frequency 1 GHz has wavelength of |
| A. | 0.4 m |
| B. | 0.5 m |
| C. | 0.2 m |
| D. | 0.3 m |
| Answer» D. 0.3 m | |
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