HTET PGT Computer Science Questions with answer
HTET PGT Computer Science Questions with answer, HSSC Computer Science Questions, Haryana PGT Computer Science Questions, HTET PGT Previous Years Computer Science Questions Paper
HTET CS/IT PGT questions
a) transmission medium
b) linear medium
c) Network LAN
d) Protocols
Answers A
2. Keyboard and traditional monitors are examples of
a) Simplex devices
b) Duplex devices
c) Half Duplex devices
d) Full Duplex devices
Answers A
3. The effectiveness of a data communications system depends on four fundamental characteristics
a) delivery, accuracy
b) timeliness and jitter
c) jitter and delivery
d) both a and b
Answers D
4. Propagation time is equals to
a) Distance/Propagation speed
b) Propagation speed/Bandwidth
c) Message size/ Bandwidth
d) Bandwidth/Queuing time
Answers A
5. Period is the inverse of
a) Frequency
b) Phase
c) Amplitude
d) Signals
Answers A
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6. The black and white TV is an example of
a) non periodic composite signal
b) periodic composite signal
c) signal
d) periodic signal
Answers A
7. If signal does not change at all, its frequency is
a) Zero
b) Maximum
c) Infinite
d) None of Above
Answers C
8. Analog data refers to information that is
a) Discrete state
b) Continuous state
c) Randomly arranged
d) None of Above
Answers B
9. We send a voice signal from a microphone to a recorder, the transmission is
a) Base band transmission
b) Broad band transmission
c) both a and b
d) None of Above
Answers A
10. The data rate depends upon
a) Bandwidth
b) Level of signals
c) Level of noise
d) All of the above
Answers D
11. Bit rate is in
a) Bits per Hertz
b) Bits Per Second
c) Nano seconds
d) Pixels per second
Answers B
12. Digital data refers to the information that is
a) Continuous
b) Discrete
c) Bits
d) Bytes
Answers B
13. The term that refers to change the digital signal to an analog signal for transmission is called
a) Modulation
b) Demodulation
c) Encapsulation
d) Bypass
Answers A
14. A sine wave is defined by
a) amplitude
b) frequency
c) Phase
d) All of the above
Answers D
15. The concept of Wavelength is equivalent to the
a) Bit rate
b) Bandwidth
c) Amplitude
d) Bit Length
Answers D
16. The term that refers to loss of energy is called
a) attenuation
b) distortion
c) Noise
d) Impairments
Answers A
17. If a noiseless channel with a bandwidth of 3000 Hz transmitting a signal with two signal levels the maximum Bit rate would be
a) 12000 bps
b) 6000 bps
c) 1800bps
d) zero
Answers B
18. In data communications, we use periodic analog signals and
a) Periodic digital signals
b) Non periodic analog signals
c) Non periodic digital signals
d) both a and c
Answers C
19. The range of frequencies contained in a composite signal is called
a) Wavelength
b) Bandwidth
c) amplitude
d) Composite
Answers B
20. SNR stands for
a) Shannon Noise ratio
b) Shannon Noise Relation
c) Signal Noise ratio
d) Signal Noise Relation
Answers C
21. The last step in Pulse Code Modulation (PCM) is
a) Quantization
b) Sampling
c) Encoding
d) Modulation
Answers C
22. The parameter that refers to the signal levels are on one side of the time axis, either above or below is
a) Unipolar
b) Bipolar
c) Polar
d) Multi level
Answers A
23. In synchronous transmission, we send bits one after the another without
a) Start bit
b) Stop bit
c) gap bit
d) All of the above
Answers D
24. The transmission that is used without the timing signal is called
a) synchronous
b) asynchronous
c) parallel
d) isochronous
Answers B
25. The unit of the signal rate is
a) Bits per second
b) Baud
c) Seconds
d) Hertz
Answers B
26. Baud rate is the number of
a) signal elements per second
b) bits per second
c) Frames per second
d) None
Answers A
27. The change or lack of change in the level of the voltage determines the value of the bit is called
a) NRZ
b) NRZ-L
c) NRZ-I
d) RZ
Answers C
28. The bandwidth is proportional to the
a) baud rate
b) data rate
c) delay rate
d) bit rate
Answers A
29. The idea of Return to Zero (RZ) and None Return to Zero-Level (NRZ-L) are combined into the
a) Manchester
b) Differential Manchester
c) Multilevel
d) Multi transition
Answers A
30. Transmission media are directly controlled by the
a) physical layer
b) data link layer
c) network layer
d) session layer
Answers A
31. The electromagnetic waves ranging in frequencies between 3 kHz and 1 GHz are called
a) High frequency
b) Infrared
c) Microwaves
d) radio waves
Answers B
32. Twisted-Pair and coaxial cable are used
a) copper
b) light
c) unwired
d) wireless
Answers A
33. RG-59 is used in
a) radio
b) thick Ethernet
c) thin Ethernet
d) cable TV
Answers D
34. Line-of-sight propagation lies above
a) 3 KHz
b) 30 MHz
c) 15 MHz
d) 2 KHz
Answers B
35. 3 KHz to 300 kHz is reserves for Radio wave and microwave that is actually
a) ground propagation
b) sky propagation
c) line-of-sight propagation
d) None
Answers A
36. Unguided medium is
a) twisted pair cable
b) coaxial cable
c) fiber optic cable
d) free space
Answers D
37. Radio waves are
a) unidirectional
b) omnidirectional
c) bidirectional
d) directional
Answers B
38. Communication channel is shared by all the machines on the network in
a) broadcast network
b) unicast network
c) multicast network
d) none
Answers A
39. Bluetooth is an example of
a) personal area network
b) local area network
c) virtual private network
d) none of the mentioned
Answers A
40. Communication between a computer and a keyboard involves ----- transmission
a) Automatic
b) Half-duplex
c) Full-duplex
d) Simplex
Answers D
41. Three or more devices share a link in connection
a) Unipoint
b) Multipoint
c) Point to point
d) None
Answers B
42. Microwaves having frequency between
a) I and 300 GHz
b) 3 kHz and 1 GHz
c) 300 kHz and 1 GHz
d) 1GHz and 300 GHz
Answers A
43. In line-or-sight propagation, very high- frequency signals are transmitted in straight lines directly from antenna to
a) sky
b) earth
c) antenna
d) planet
Answers C
44. The most common unshielded twisted pair connector is
a) RG-45
b) RG-59
c) RG-58
d) RG-ll
Answers A
45. Unshielded Twisted-Pair used in
a) telephone
b) T-lines
c) LAN
d) token ring networks
Answers A
46. Three or more devices share a link in ________ connection
a) Unipoint
b) Multipoint
c) Point to point
d) None
Answers B
47. In this topology there is a central controller or hub
a) Star
b) Mesh
c) Ring
d) Bus
Answers A
48. This topology requires multipoint connection
a) Star
b) Mesh
c) Ring
d) Bus
Answers D
49. Data communication system spanning states, countries, or the whole world is
a) LAN
b) WAN
c) MAN
d) None
Answers B
50. Data communication system within a building or campus is
a) LAN
b) WAN
c) MAN
d) None
Answers A
51. Expand WAN
a) World area network
b) Wide area network
c) Web area network
d) None of the mentioned
Answers B
52. In File Transfer Protocol (FTP), while the control connection is open, the data connection can be
opened and closed
a) One time
b) Several Times
c) Multiple Times
d) None of the given
Answers C
53. File Transfer Protocol (FTP), uses the well- known port 21 is used for the control connection and the well-known port 20 for the
a) Data Rate
b) Data Connection
c) Data Protocol
d) Data Congestion
Answers B
54. TELNET is a general-purpose
a) client/server application program
b) host/server application program
c) remote system
d) terminal emulator
Answers A
55. The FTP uses the services of
a) TCP
b) UDP
c) SMTP
d) DNS
Answers A
56. In Hyper Text Transfer Protocol (HTTP), support
a) Proxy Domain
b) Proxy Documents
c) Proxy Server
d) Proxy IP
Answers C
57. The Hypertext Transfer Protocol (HTTP), uses the services of TCP on
a) well-known port 80
b) well-known port 81
c) well-known port 82
d) well-known port 83
Answers A
58. URL stands for
a) Uniform Resource Loader
b) Uniform Resource Line
c) Uniform Resource Locator
d) Uniform Resource Lighter
Answers C
59. If 5 files are transfered from server A to client B in the same session. The number of connection between A and B is
a) 5
b) 10
c) 2
d) 6
Answers D
60. Choose the statement which is wrong incase of SMTP
a) It requires message to be in 7bit ASCII format
b) It is a pull protocol
c) It transfers files from one mail server to another mail server
d) None of the mentioned
Answers D
61. Which one of the following protocol is used to receive mail messages?
a) SMTP
b) post office protocol
c) internet message access protocol
d) all of the mentioned
Answers D
62. Unlike User Datagram Protocol (UDP), the Transmission Control Protocol (TCP) has the Services which is
a) Connection Oriented
b) Connectionless
c) Connection generated
d) Connection Organizing
Answers A
63. The maximum size of the TCP header is
a) 20 bytes
b) 40 bytes
c) 60 bytes
d) 80 bytes
Answers C
64. If an Address Resolution Protocol (ARP) request is broadcast, an Address Resolution Protocol (ARP) reply is
a) Universal
b) Unicast
c) Multicast
d) Data link
Answers B
65. An IPv4 address is
a) 32 bits long
b) 64 bits long
c) 128 bits long
d) 192 bits long
Answers A
66. IGMP stands for
a) Internet Group Management Packet
b) Internet Group Management Path
c) Internet Group Management Protocol
d) Internet Group Management Ping
Answers C
67. The 14.23.120.8 address lies in which class
a) class A
b) class B
c) class D
d) class E
Answers A
68. Find the even parity bit for 1001011
a) 0
b) 1
c) 2
d) None
Answers A
69. CRC stands for
a) combine resistance check
b) cyclic redundancy cod
c) combine redundancy code
d) cyclic redundancy check
Answers D
70. The checksum is used in the Internet by several protocols although not at the
a) session layer
b) transport layer
c) network layer
d) data link layer
Answers D
71. The data link layer takes the packets from------ and encapsulates them into frames for
b) physical layer
c) transport layer
d) application layer
Answers A
72. ICMP stands for
a) Internet Control Message Protocol
b) Internet Control Message Provider
c) Internet Control Messenger
d) All of them
Answers A
73. One of the main responsibilities of Internet Control Message Protocol (ICMP), is to report
a) IP
b) Data
c) Queries
d) Errors
Answers D
74. The Dotted-decimal notation of 10000001 00001011 00001011 11101111 would be
a) 193.131.27.255
b) 129.11.11.239
c) 192.168.10.9
d) 172.16.11.3
Answers B
75. The class of the IP addresses 208.34.54.12 will be
a) class A
b) Class B
c) Class C
d) Class E
Answers C
76. Which one of the following task is not done by data link layer?
a) framing
b) error control
c) flow control
d) channel coding
Answers D
77. A Virtual-Circuit Network (VCN) is normally implemented in the
a) session layer
b) data link layer
c) network layer
d) physical layer
Answers C
78. Virtual-Circuit Networks and datagram networks are the sub categories of
a) message-switched networks
b) Packet-switched networks
c) Circuit-Switched Networks
d) None of them
Answers B
79. In a packet-switched network, resources are allocated
a) randomly
b) on demand
c) reserved already
d) both a and c
Answers B
80. Datagram switching is done at the
a) network layer
b) physical layer
c) session layer
d) data link layer
Answers D
81. Setup, data transfer, and connection teardown are three phases of
a) circuit switching
b) packet switching
c) message switching
d) None
Answers A
82. Circuit switching takes place at the
a) session layer
b) application layer
c) data link layer
d) physical layer.
Answers D
83. In Circuit Switching, the resources need to be reserved during the
a) Data transfer phase
b) teardown phase.
c) setup phase
d) propagation phase
Answers C
84. The Asynchronous Transfer Mode (ATM) network is an example of
a) Packet switching network
b) Datagram Networks
c) Virtual circuit network
d) message switched network
Answers C
85 .A proxy firewall filters at the
a) physical layer
b) application layer
c) data link layer
d) network layer
Answers B
86. A packet filter firewall filters at the
a) application or transport
b) data link layer
c) physical
d) network or transport layer
Answers D
87. The Internet Control Message Protocol ( ICMP )
A. allows gateways to send error control message to other gateways or hosts.
B. provides communication between the internet protocol software on one machine and the internet protocol software on another.
C. only reports error conditions to the original source, the source must relate errors to individual application programs and take action to correct the problem.
D. All of these.
Answers D
88. The closeness of the recorded version to the original sound is called
A. fidelity
B. Digitization
C. Sampling.
D. Nyquist Theorem
Answers A
89. Which layers of the OSI model are host to host layers ?
A. Transport, Session, Presentation, Application
B. Network, Transport, Session, Presentation
C. Datalink, Network, Transport, Session
D. Physical, Datalink, Network, Transport
Answers A
90. A is a communication pathway connecting two or more devices. Another of its key characteristic is that it is a shared medium. A signal transmitted by any one device is available for reception by all other devices attached to it.
A. Train
B. Bus
C. Tram
D. Aeroplane
Answers B
91. Bridge works in which layer of the OSI model ?
A. Application Layer.
B. Transport Layer
C. Network Layer
D. Datalink Layer
Answers D
92. What is the meaning of bandwidth in a network?
A. Transmission capacity of a communication channel.
B. Connected computers in a network.
C. Class of IP used in network.
D. Interconnected by communication channels.
Answers A
93. Which one of the following transmission systems provides the highest data rate to an individual device ?
A. Computer Bus
B. Telephone Bus
C. Voice mode
D. Lease lines
Answers A
94. The process of taking a snapshot of the waveform at regular intervals and representing it as a binary number is known as
A. Sampling
B. Standard Assessment
C. Sequential Formatting
D. Sound structure
Answers A
95. The X.25 standard specifies a
A. Technique for start-stop data
B. technique for dial access
C. DTE/DCE interface.
D. Data bit rate.
Answers C
96. Frames from one LAN can be transmitted to another LAN via a device called
A. Router
B. Bridge
C. Repeater
D. Modem
Answers B
97. With an IP of 100, you currently have 80 subnets. What subnet mask should you use to maximize the number of available host ? (Incomplete Question )
A. 192
B. 224
C. 248
D. 252
Answers D
98. The houses the switches in token ring
A. Transceiver
B. Nine pin connector
C. MAU
D. NIC
Answers C
99. In OSI network architecture, routing is performed by the
A. network Layer
B. Data Link Layer
C. Transport Layer
D. Session Layer
Answers A
100. The Hamming (7, 4) code for 0000 using even parity is
A. 0000000 B. 1111111
C. 2222222 D. 12121212
Answers A
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