Q1: The most common type of connector used by coaxial cable is:
(A) BNC
(B) RJ-11
(C) RJ-57
(D) RJ-45
Answer: (A) BNC
Q2: Quadrature Amplitude Modulation is the mechanism of:
(A) Digital to analog conversion
(B) Analog to analog conversion
(C) Analog to digital conversion
(D) Digital to digital conversion
Answer: (A) Digital to analog conversion
Q3: Which waves have established standards for communication between devices such as keyboards, mice, PCs, and printers?
(A) Microwaves
(B) Radio waves
(C) Simple waves
(D) Infrared waves
Answer: (D) Infrared waves
Q4: WDM stands for:
(A) Worst Data Manipulation
(B) Wideband De-Modulation
(C) Wideband Division Multiplexing
(D) Wavelength Division Multiplexing
Answer: (D) Wavelength Division Multiplexing
Q5: Voltage Controlled Oscillator (VCO) generates:
(A) Carrier signals
(B) Periodic signals
(C) Signal elements
(D) Composite signals
Answer: (A) Carrier signals
Q6: A virtual-circuit network operates on which layer?
(A) Network layer
(B) Physical layer
(C) Data link layer
(D) Application layer
Answer: (A) Network layer
Q7: The top organization that provides support for the Internet standard process is:
(A) Internet Society
(B) Internet Architecture Board
(C) IETF
(D) IRTF
Answer: (A) Internet Society
Q8: In Pulse Code Modulation, sampling is also referred to as:
(A) Pulse Amplitude Modulation
(B) Pulse Sample Modulation
(C) Pulse Line Modulation
(D) Pulse Frequency Modulation
Answer: (A) Pulse Amplitude Modulation
Q9: Unit of phase is:
(A) Watts
(B) Bauds
(C) Degree
(D) Bits per second
Answer: (C) Degree
Q10: Entire frequency band in the United States is regulated by:
(A) ITU
(B) FCC
(C) ANSI
(D) NASA
Answer: (B) FCC
Q11: In TDM digital hierarchy, DS-0 channel has data rate of:
(A) 64 kbps
(B) 32 kbps
(C) 128 kbps
(D) 1.544 Mbps
Answer: (A) 64 kbps
Q12: Radio waves propagate in:
(A) All directions
(B) Left direction
(C) Right direction
(D) Only up and down direction
Answer: (A) All directions
Q13: A switched network consists of interlinked devices called:
(A) Roots
(B) Nodes
(C) Points
(D) Systems
Answer: (B) Nodes
Q14: In circuit switched networks we have low efficiency but minimal:
(A) Delay
(B) Error
(C) Speed
(D) Throughput
Answer: (A) Delay
Q15: Which noise occurs due to random motion of electrons in a wire?
(A) Thermal noise
(B) Impulse noise
(C) Crosstalk
(D) Induced noise
Answer: (A) Thermal noise
Q16: In Amplitude Shift Keying, which property of the signal changes?
(A) Amplitude and frequency
(B) Amplitude
(C) Frequency and amplitude
(D) Phase
Answer: (B) Amplitude
Q17: A twisted pair cable consists of:
(A) Two conductors
(B) Five conductors
(C) Four conductors
(D) Three conductors
Answer: (A) Two conductors
Q18: In quantization, sampling output is divided into levels based on range of:
(A) Frequency
(B) Amplitude
(C) Time period
(D) None
Answer: (B) Amplitude
Q19: In a star network with four computers and one switch, the number of cables needed is:
(A) 1
(B) 2
(C) 3
(D) 4
Answer: (D) 4
Q20: Which of the following is not a characteristic of a sine wave?
(A) Amplitude
(B) Segmentation
(C) Phase
(D) Frequency
Answer: (B) Segmentation
Q21: If each station in a network is connected to every other station with dedicated links, it is called:
(A) Bus topology
(B) Ring topology
(C) Star topology
(D) Mesh topology
Answer: (D) Mesh topology
Q22: Which of the following can be published using Request for Comments (RFC)?
(A) Proposed Standard
(B) Draft Standard
(C) Internet Draft
(D) Internet Standard
Answer: (C) Internet Draft
Q23: In serial transmission, which mode is cheaper but slower?
(A) Synchronous
(B) Asynchronous
(C) Isochronous
(D) Metachronous
Answer: (B) Asynchronous
Q24: QPSK stands for:
(A) Quality Phase Shift Key
(B) Queuing Phase Shift Key
(C) Quadrature Phase Shift Key
(D) Quality Physical Shift Key
Answer: (C) Quadrature Phase Shift Key
Q25: In which modulation does the carrier frequency change according to the derivative of the modulating signal amplitude?
(A) Phase modulation
(B) Frequency modulation
(C) Amplitude modulation
(D) Quadrature modulation
Answer: (A) Phase modulation
Q26: In FSK, baud rate is less than or equal to:
(A) Bit rate
(B) Byte rate
(C) Signal rate
(D) Decibel rate
Answer: (A) Bit rate
Q27: Bipolar encoding uses:
(A) One voltage level
(B) Two voltage levels
(C) Three voltage levels
(D) Four voltage levels
Answer: (C) Three voltage levels
Q28: A low pass channel has bandwidth between two stations.
(A) Dedicated
(B) Shared
(C) Multiplexed
(D) Infinite
Answer: (A) Dedicated
Q29: Which layer places data on the transmission medium?
(A) Application layer
(B) Physical layer
(C) Network layer
(D) Transport layer
Answer: (B) Physical layer
Q30: Block coding scheme contains:
(A) One step
(B) Two steps
(C) Three steps
(D) Four steps
Answer: (C) Three steps
Q31: BFSK stands for:
(A) Baud Frequency Shift Key
(B) Binary Frequency Shift Key
(C) Barrier Frequency Shift Key
(D) Bridge Frequency Shift Key
Answer: (B) Binary Frequency Shift Key
Q32: According to Fourier analysis, frequencies obtained from digital signals are:
(A) Continuous
(B) Discrete
(C) Bit length
(D) Homogeneous
Answer: (A) Continuous
Q33: If a signal is amplified, the decibel value becomes:
(A) Zero
(B) One
(C) Negative
(D) Positive
Answer: (D) Positive
Q34: In frequency domain plot, which value is replaced by frequency?
(A) Wavelength
(B) Amplitude
(C) Phase
(D) Time
Answer: (D) Time
Q35: With a 4-bit block, we can have:
(A) 4 groups
(B) 6 groups
(C) 7 groups
(D) 8 groups
Answer: (D) 8 groups
Q36: Loss of energy in signal is called:
(A) Noise
(B) Delay
(C) Attenuation
(D) Distortion
Answer: (C) Attenuation
Q37: Unipolar, polar, and bipolar are types of:
(A) Line coding
(B) Differential Manchester
(C) NRZ-I
(D) Block coding
Answer: (A) Line coding
Q38: If a system sends 5 bits in half a second, the bit rate is:
(A) 5 bps
(B) 10 bps
(C) 50 bps
(D) 0.2 bps
Answer: (B) 10 bps
Q39: A signal that repeats a pattern in fixed time is called:
(A) Non periodic
(B) Periodic
(C) A periodic
(D) Wavelength
Answer: (B) Periodic
Q40: Which formula is used to calculate data rate for a noisy channel?
(A) Shannon formula
(B) Nyquist bit rate formula
(C) Propagation formula
(D) Greedy formula
Answer: (A) Shannon formula