Data Communication MCQs with Answers
Practice important Data Communication MCQs with answers and explanations.
Chapter: 100
Q1381:
In FHSS, how are the frequencies selected for transmission?
A. Randomly from all frequencies
B. Based on modulation amplitude
C. In a sequence determined by a hopping pattern
D. By user input
Correct Answer:
C
Chapter: 100
Q1382:
The process of changing carrier frequencies in FHSS is called ______.
A. Frequency division
B. Carrier modulation
C. Frequency hopping
D. Bit chipping
Correct Answer:
C
Chapter: 100
Q1383:
How many different carrier frequencies are used in FHSS?
A. One
B. Two
C. Fixed number ‘M’
D. Unlimited
Correct Answer:
C
Chapter: 100
Q1384:
FHSS helps avoid interference and interception by ______.
A. transmitting at very low power
B. using long wires for signal shifting
C. randomly changing carrier frequency
D. staying on one frequency
Correct Answer:
C
Chapter: 100
Q1385:
In DSSS, what replaces each data bit?
A. Parity bit
B. Encoded character
C. ‘n’ bits from a spreading code
D. Error checking code
Correct Answer:
C
Chapter: 100
Q1386:
What is the full form of DSSS?
A. Direct Signal Spread Spectrum
B. Digital Sequence Signal Spreading
C. Direct Sequence Spread Spectrum
D. Digital Signal Spectrum Spreading
Correct Answer:
C
Chapter: 100
Q1387:
In DSSS, the new bits that replace the data bit are called ______.
A. chips
B. codes
C. pulses
D. frames
Correct Answer:
A
Chapter: 100
Q1388:
What is the rate of chips compared to the original data rate in DSSS?
A. Equal to data rate
B. Lower than data rate
C. Two times the data rate
D. ‘n’ times the data rate
Correct Answer:
D
Chapter: 100
Q1389:
DSSS and FHSS both ______.
A. use the same chip rate
B. expand bandwidth of the original signal
C. use amplitude modulation
D. transmit at baseband frequency
Correct Answer:
B
Chapter: 100
Q1390:
Which spread spectrum method replaces each bit with a sequence of bits?
A. FHSS
B. TDMA
C. DSSS
D. FDM
Correct Answer:
C
Chapter: 100
Q1391:
Bandwidth sharing in FHSS is achieved through ______.
A. multiple simultaneous transmissions
B. taking turns using frequencies
C. continuous frequency jamming
D. using identical hopping codes
Correct Answer:
B
Chapter: 100
Q1392:
Which method spreads the signal across multiple frequencies by hopping between them?
A. FDM
B. FHSS
C. DSSS
D. AM
Correct Answer:
B
Chapter: 100
Q1393:
Which of the following is true about DSSS?
A. It compresses signal to reduce bandwidth
B. It increases data rate
C. It expands signal using chips
D. It reduces security risks
Correct Answer:
C
Chapter: 100
Q1394:
In DSSS, what is the sequence used to expand each data bit?
A. Hopping code
B. Error code
C. Spreading code
D. Parity check code
Correct Answer:
C
Chapter: 101
Q1395:
Which layer are transmission media considered part of in the OSI model?
A. Data link layer
B. Network layer
C. Application layer
D. Layer zero
Correct Answer:
D
Chapter: 101
Q1396:
What type of media is twisted pair cable classified as?
A. Wireless media
B. Optical media
C. Metallic media
D. Non-metallic media
Correct Answer:
C
Chapter: 101
Q1397:
Twisted pair and coaxial cables are examples of ______.
A. Non-conductive media
B. Optical media
C. Metallic media
D. Wireless media
Correct Answer:
C
Chapter: 101
Q1398:
What is the role of transmission media in the OSI model?
A. Handle application protocols
B. Control data encryption
C. Transmit signals between devices
D. Manage routing
Correct Answer:
C
Chapter: 101
Q1399:
Which of the following is NOT a metallic transmission medium?
A. Coaxial cable
B. Twisted pair
C. Optical fiber cable
D. Shielded twisted pair
Correct Answer:
C
Chapter: 101
Q1400:
Fill in the blank: Transmission media that use air or vacuum to carry signals are known as ______.
A. metallic media
B. non-metallic media
C. optical media
D. free space media
Correct Answer:
D