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Thursday, 19 April 2018

1000 Most Expected Questions for JKSSB Teacher Exam (90% Syllabus Coverage)


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Big Exam, Tough Competition.? 

This is the Last Thing that you need to Read before JKSSB Teacher Exam 2018    




If you are preparing for JKSSB Teacher Exams 2018, then we have some good news for you. Teacher Exam Schedule in announced and Admit cards are available for Download. JKSSB Teacher Exam will be held in Three Phases.

1) First Phase, comprises of Exam for Science/Maths Teacher (21st April 2018)

2) The second Phase has the exam of Urdu Teachers (28th April 2018)

3) In the Final phase, there will be Exam for General Teachers ( In May 2018).

Admit Cards for JKSSB Teacher Posts are already been announced and you can download it from the JKSSB Online Portal (www.ssbjk.in)

Today, in this post, we are going to share the Most Important Study Material and Preparation Capsule for you.

Yes, we will be Sharing the 1000 Most Expected and Important Questions for JKSSB Teacher Exam 2018.

These Questions are for those Subjects of the Syllabus, that is common for All the Three Categories of Teacher Posts. We will be covering, Questions from J&K General Knowledge, Computer and Environmental Science. If you remember, In 2017, we have shared the 500 Expected Questions for JKSSB Exams and Today, we will add another 500 Questions to make it 1000 Important Questions.

These Questions are particularly useful for those, who are in the Final stages of the preparation and requires the much needed Final revision, right before the exam.

Here is the Overview of Subject wise Expected Questions for JKSSB Teacher Exam, 2018.


1000 Expected Questions for JKSSB Teacher Exams 2018
S No.
Subject
No. of Questions
1
400
2
Computer Knowledge
300
3
300



Why you should Read these Expected Questions?

Questions that we are going to share in this article are from J&K GK, Computer and Environmental Science and these three are the Common Subjects for the All Teacher Posts. 


  • It is expected that 70 to 80%  Questions from these subjects will be asked from these 1000 Expected Questions. 
  • We have compiled questions in such a way that it covers the Complete Syllabus of these subjects.
  • It is a must go through before the Final Exam to check your preparation.



300 Expected Computer Questions for JKSSB Teacher Exam. 

In this section, you can read the 300 Expected Questions for JKSSB Teacher Exam. and the In the subsequent pages, you can check the Expected Questions of other subjects too.

1) Who is known as the "Father of Computers"?

Ans Charles Babbage

2) How many Generation of Computers do we actually?

Ans Five Generations

3) What are the Characteristics of First Generation Computers?

Ans: i) These were vacuum Tubes based machines
ii)  Large in Size, Expensive to Operate
iii) Instructions were written in Machine Language
iv) Computation Time was in Milliseconds

4)  Name the Characteristics of Second Generation Computers?

Ans: i) These were Transistor Based Machines
ii) They used the Stored Program Concept
iii) Programs were written in Assembly Language
iv) Smaller in Size, Less Expensive and Required Lesser Maintenance.
v) Computation time was in Microseconds.


5)  What are the Characteristics of Third Generation Computers?

Ans i) Third Generation Computers used the Integrated Circuits (IC). In IC chip, multiple transistors are placed on a Silicon chip.  
ii) Size of these computers was quite small compared to the second generation computers
iii) High-level languages were used extensively for programming, instead of machine language and assembly language
iv) Cost of Computers was much less.
v) Computation time was in Nano-Seconds.


6) What are the Characteristics of Fourth Generation Computers?

Ans i) These computers used microprocessors, which were designed using the LSI (Large-scale Integration) and VLSI (Very Large Scale Integration).
ii) The computers became small, portable, reliable and cheap
iii) Computation time is in picoseconds.
iv) Several new operating systems like the MS-DOS and MS- Windows developed during this time
v) This generation of computers supported Graphical User Interface (GUI)
vi) Personal computers became available to the home user

7) Name the Characteristics of Fifth Generation Computers?

Ans i) Fifth generation computers use Super Large Scale Integrated (SLSI) chips that are able to store millions of components on a single chip
ii) The fifth generation computers are based on Artificial Intelligence (AI)
iii) Computers uses parallel processing that allows several instructions to be executed in parallel, instead of serial execution
iv) These computers uses Artificial Intelligences and are still being developed. 
v) Current Generation of computers is Fifth Generation.

8) What are the main components of a Computer?

Ans I/O Unit, CPU and memory unit.

9) What is called the Brain of the computer?

Ans CPU or microprocessor.

10) What are various parts of CPU?

Ans Airthmatic Login Unit (ALU), Control Unit and Registers

11) What constitutes the memory Unit?

Ans Primary Memory, Secondary Memory and Cache Memory.


12) Primary Memory consists of ?

Ans RAM and ROM

13) What are Registers?

Ans Registers are low-storage capacity, high-speed storage areas within the CPU. The data, instructions, addresses and intermediate results of processing are stored in the registers by the CPU

14) What is Cache Memory?

Ans Cache memory is a very high-speed memory placed in between RAM and CPU, to increase the processing speed. Cache memory is available in three levels L1, L2 and L3.Cache memory is a storage buffer that stores the data that is used more often, temporarily, and makes them available to CPU at a fast rate. During processing, CPU first checks cache for the required data. If data is not found in cache, then it looks in the RAM for data.

Cache memory is very expensive, so it is smaller in size. Generally, computers have cache memory of sizes 256 KB to 2 MB

15) What are the Characteristics of RAM?

Ans RAM provides temporary storage, has a limited storage capacity and is a volatile memory. The access speed of RAM is faster than the access speed of the storage devices like a hard disk. The data and the instructions stored in the hard disk are brought into the RAM so that the CPU can access the data and the instructions and process it.

16) What is ROM?

Ans ROM is a non-volatile memory but is a read-only memory. The storage in ROM is permanent in nature and is used for storing standard processing programs that permanently reside in the computer. ROM comes programmed by the manufacturer

17) What is Secondary Memory?

Ans The secondary memory stores data and instructions permanently. It has a high storage capacity than the primary memory.Magnetic tape drives, disk drives and optical disk drives are the different types of storage devices


18) What is RISC and CISC?

Ans RISC and CISC are the two kinds of microprocessors classified on the basis of the instruction set. CISC has a large and complex instruction set. RISC has fewer instructions.

19) What is a Bus?

Ans The different components of the computer are connected with each other by a bus. A computer bus is of two types—system bus and expansion bus

20) What is System Bus?

Ans The System Bus connects the CPU, system memory, and all other components on the motherboard

21)  What is Expansion Bus?


Ans The Expansion Bus connects the different external devices, peripherals, expansion slots, I/O ports and drive connections to the rest of the computer

22) What are the various metrics that affects the speed of a computer?

Ans The performance of the computer is affected by the size of registers, size of RAM, speed of system clock, width of bus, and size of cache memory

23) What is BIOS and CMOS

Ans BIOS and CMOS are present on the motherboard. BIOS is stored in ROM and is used as an interface between the operating system and the motherboard. The time, the system date, and essential system settings are saved in CMOS memory chip present on the motherboard. When the computer power is switched off, CMOS chip remains alive powered by a button battery


24) What is the smallest unit that is used to represent data in a computer?

Ans Bit


25) Data Units and their Equivalents?

Ans














26) What is Internal Memory?

Ans Internal memory has limited storage capacity, provides temporary storage, has fast access, the data and instructions stored in it are used by the CPU during execution, and is more expensive than secondary memory. Registers, cache memory, and primary memory constitute the internal memory. RAM and ROM are the two kinds of primary memory


27) What is External Memory?

Ans External memory or Secondary memory have very high storage capacity, are non-volatile unless erased by user, have slow access, store the data and instructions that are not currently being used by CPU, and are cheapest among all memory. Magnetic disk and optical disk are storage devices



28) What is DRAM and SRAM?

Ans RAM memory chips are of two types—DRAM and SRAM. DRAM is used as main memory as it is small and cheap. SRAM chip is used in cache memory due to its high speed

29) What are various Recordable Opticle Disks?

Ans Recordable optical disks are CD-R, CD-RW and DVD-R


30) What is Bootstrap Loader?

Ans Bootstrap Loader is a program whose purpose is to start the computer software for operation when the power is turned on. It loads the operating system into RAM and launches it. It generally seeks the operating system on the hard disk. The bootstrap loader resides in the ROM. The BIOS initiates the bootstrap sequence

31) What are Different Types of ROM?

Ans ROMs are of different kinds. They have evolved from the fixed read-only memory to the
ones that can be programmed and re-programmed. They vary in the number of re-writes
and the method used for the re-writing. Programmable ROM (PROM), Erasable
Programmable ROM (EPROM) and Electrically Erasable Programmable ROM
(EEPROM) are some of the ROMs. All the different kinds of ROM retain their content
when the power is turned off.
  •  PROM can be programmed with a special tool, but after it has been programmed the contents cannot be changed. PROM memories have thousands of fuses (or diodes). High voltage (12 V) is applied to the fuses to be burnt. The burnt fuses correspond to 0 and the others to 1.
  • EPROM can be programmed in a similar way as PROM, but it can be erased by exposing it to ultra violet light and re-programmed. EPROM chips have to be removed from the computer for re-writing.
  • EEPROM memories can be erased by electric charge and re-programmed. EEPROM chips do not have to be removed from the computer for re-writing
32) What is Flash Memory?

Ans Flash Memory is a kind of semiconductor-based non-volatile, rewritable computer memory that can be electrically erased and reprogrammed. It is a specific type of EEPROM

33) How does a user Interacts with Computer system?

Ans Through Input / Output Devices


34) Lists a Few Input Devices?

Ans Keyboard, Mouse, Digitizing Tablet, Track Ball, Joystick, TouchScreen, Light Pen, Speech Recognition System, Digital camera, Scanner, Magnetic Ink Character Recognition (MICR), Optical Character Recognition (OCR), Optical Mark Recognition (OMR), Barcode Reader


35) Name a Few Output Devices?

Ans Monitor, Visual Display Terminal, Printer, Plotter, Computer Output on Microfi lm (COM), Video Output System, Audio Response System


36) Categorize various types of Printers?

Ans Impact Printers: Impact printers use the typewriter approach of physically striking a typeface against the paper and inked ribbon. Impact printers can print a character or an entire line at a time.Dot Examples of Impact Printers: Matrix Printers, Daisy Wheel Printers, Drum Printers are line printers

Non-Impact Printers:  Printers do not hit or impact a ribbon to print. They use electro-static chemicals and ink-jet technologies. Non-impact printers are faster and quieter than impact printers. They produce high-quality output and can be used for printing text and graphics both in black and white and color. Ink-jet printers and laser printers are non-impact printers


Example: Ink Jet, Laser Printers

37) What is OCR?

Ans: OCR is a technique for the scanning of a printed page, translating it, and then using the OCR software to recognize the image as ASCII text that is editable

38)What is OMR?

Ans OMR uses an optical mark reader to detect marks on a paper. OMR is widely used to read answers of objective type tests, questionnaires, etc

39) What is MICR?


Ans MICR is used in banks to process large volumes of cheques. It is used to recognize the magnetic encoding numbers printed at the bottom of a cheques


40) Summary of Number System?

Ans In computer science, decimal number system (base 10), binary number system (base 2), octal number system (base 8), and hexadecimal number system (base 16) concern us


41) What is Decimal Number system?

Ans: Decimal number system has 10 digits—0 to 9, the maximum digit being 9

42) Binary Number System?

Ans Binary number system has two digits—0 and 1

43) Octal Number System?A computer system consists of hardware and software. The computer hardware cannot perform any task on its own. It needs to be instructed about the tasks to be performed. Software is a set of programs that instructs the computer about the tasks to be performed. Software tells the computer how the tasks are to be performed; hardware carries out these tasks

Ans Octal number system consists of eight digits—0 to 7, the maximum digit being 7.

44) Hexadecimal Number System?

Ans Hexadecimal number system has sixteen digits—0 to 9, A, B, C, D, E, F, where (A is for 10, B is for 11, C—12, D—13, E—14, F—15). The maximum digit is F, i.e., 15.

45) What is a Computer Software?

Ans A computer system consists of hardware and software. The computer hardware cannot perform any task on its own. It needs to be instructed about the tasks to be performed. Software is a set of programs that instructs the computer about the tasks to be performed. Software tells the computer how the tasks are to be performed; hardware carries out these tasks.

Computer Software is Broadly Classified into

i) System Software
ii) Application Software

46) What is System Software?

Ans System software provides the basic functions that are performed by the computer. It is necessary for the functioning of a computer. Application software is used by the users to perform specific tasks. The user may choose the appropriate application software, for performing a specific task, which provides the desired functionality. The system software interacts with hardware at one end and with application software at the other end.

The purposes of the system software are: 
  • To provide basic functionality to computer.
  • To control computer hardware, and 
  • To act as an interface between user, application software and computer hardware.
47) What are various Examples of System Software?

Ans Operating system, device drivers, and system utilities constitute the system software for management of computer and its resources. The programming language software, translator software, loader, and linker are also categorized as system software, and are required for the application software development.

48) What is an Operating system?

Ans Operating System (OS) is an important part of a computer. OS intermediates between the user of a computer and the computer hardware. Different kinds of application software use specific hardware resources of a computer like CPU, I/O devices and memory, as needed by the application software.
  • It provides an environment in which users and application software can do work. 
  •  It manages different resources of the computer like the CPU time, memory space, file storage, I/O devices etc. During the use of computer by other programs or users, the operating system manages various resources and allocates them whenever required, efficiently. 
  •  It controls the execution of different programs to prevent the occurrence of an error. 
  •  It provides a convenient interface to the user in the form of commands and graphical interface, which facilitates the use of a computer.

49) What are the various Examples of Operating System?

Ans Microsoft Disk Operating System (MS-DOS), Windows 7, Windows XP, Windows 8, Windows 10, Linux, UNIX, and Mac OS X Snow Leopard

50) What is a Device Driver?

Ans A device driver acts as a translator between the hardware and the software that uses the devices.

Some devices that are commonly connected to the computer are—keyboard, mouse, hard disk, printer, speakers, microphone, joystick, webcam, scanner, digital camera, and monitor. For proper working of a device, its corresponding device driver must be installed on the computer

51)  What are System Utilities?

Ans System utility software is required for the maintenance of the computer. System utilities are used for supporting and enhancing the programs and the data in a computer

52) What are programming Languages?

Ans A Programming Language consists of a set of vocabulary and grammatical rules, to express the computations and tasks that the computer has to perform.Each language has a unique set of keywords (words that it understands) and a special syntax for organizing program instructions. The programming language should be understood, both by the programmer (who is writing the program) and the computer.

A computer understands the language of 0∙s and 1∙s, while the programmer is more comfortable with English-like language

53) Categorize Programming Languages?

Ans i) High-Level Language
ii) Assembly Language
iii) Machine Language.

54) What is a High-Level Language?

Ans High-level Language is easier to understand and use for the programmer but difficult for the computer.A program in a high-level language is written in English-like language. Such languages hide the details of CPU operations and are easily portable across computers

Examples: COBOL, BASIC, FORTRAN, C, C++, Java etc

55) What is an Assembly Language?

Ans  Assembly Language falls in between machine language and high-level language. They are similar to machine language, but easier to program in, because they allow the programmer to substitute names for numbers

A program written in assembly language uses symbolic representation of machine codes needed to program a particular processor (CPU) or processor family

The program written in assembly language is the source code, which has to be converted into machine code, also called object code, using translator software, namely, assembler


56) What is a Machine Language?

Ans Machine Language is what the computer can understand but it is difficult for the programmer to understand. Machine languages consist of numbers only. Each kind of CPU has its own unique machine language

  • A program written in machine language is a collection of binary digits or bits that the computer reads and interprets
  •  It is difficult to write a program in machine language as it has to be written in binary code. For e.g., 00010001 11001001. Such programs are also difficult to modify.
57) What is a Translator Software?

Ans Translator software is used to convert a program written in high-level language and assembly language to a form that the computer can understand. Translator software converts a program written in assembly language, and high-level language to a machine-level language program

58) Categorize the Translator Software?

Ans There are three different kind of translator software:
  • Assembler
  •  Compiler
  • Interpreter. 
59) What is an Assembler?

Ans Assembler are used to convert assembly language code into machine code

60) What is a Compilor?

Ans Compiler is the software that translates the program written in a high-level language to machine language. The program written in the high-level language is referred to as the source code and compiled a program is referred as the object code.

Some languages that use a compiler are C++, COBOL, Pascal, and FORTRAN

61) What is Interpreter?

Ans The purpose of the interpreter is similar to that of a compiler. The interpreter is used to convert the high-level language program into computer-understandable form. However, the interpreter functions in a different way than a compiler. Interpreter performs line-by-line execution of the source code during program execution. The interpreter reads the source code line-by-line, converts it into machine understandable form, executes the line, and then proceeds to the next line. Some languages that use an interpreter are BASIC and Python.


62) Difference Between Compilor and Interperator?

Ans Compiler and Interpreter are used to convert a program written in the high-level language to machine language; however, they work differently. The key differences between a compiler and an interpreter are as follows:


  •  Interpreter looks at a source code line-by-line. Compiler looks at the entire source code. 
  • The interpreter converts a line into machine executable form, executes the line, and proceeds with the next line. Compiler converts the entire source code into object-code and creates the object code. The object code is then executed by the user. 
  • For a given source code, once it is compiled, the object code is created. This object code can be executed multiple number of times by the user. However, interpreter executes line-by-line, so executing the program using an interpreter means that during each execution, the source code is first interpreted and then executed. 
  • During execution of an object code, the compiler is not required. However, for interpretation, both interpreter and the source code is required during execution (because source code is interpreted during execution). 
  • Since interpreter interprets line-by-line, the interpreted code runs slower than the compiled code.
63) What is a Linker?

Ans Linker is a program that links several object modules and libraries to a single executable program. The compiled and the linked program are called the executable code.

64) What is a Loader?


Ans The loader software is used to load and relocate the executable program in the main memory. The software has to be loaded into the main memory during execution. Loader assigns storage space to the program in the main memory for execution

65) What is an application Software?

Ans The software that a user uses for accomplishing a specific task is the application software. Application software may be a single program or a set of programs. A set of programs that are written for a specific purpose and provide the required functionality is called software package. Application software is written for different kinds of applications—graphics, word processors, media players, database applications, telecommunication, accounting purposes etc

Example: MS Word, Photoshop, Tally, MS-Excel, Autodesk, Autocad etc.

66) What is a Shareware?

Ans Shareware is a program that the user is allowed to try for free, for a specified period of time, as defined in the license. It is downloadable from the Internet. When the trial period ends, the software must be purchased or uninstalled.

67) What is a Freeware?


Ans Freeware is software that is free for personal use. It is downloadable from the Internet. The commercial use of this software may require a paid license. The author of the freeware software is the owner of the software, though others may use it for free. The users abide by the license terms, where the user cannot make changes to it, or sell it to someone else


68) Open-Source Software?

Ans Open-Source Software is software whose source code is available and can be customized and altered within the specified guidelines laid down by the creator. Unlike public domain software, open-source software has restrictions on their use and modification, redistribution limitations, and copyrights. Linux, Apache, Firefox, OpenOffice are some examples of open-source software

69) OEM Software

Ans OEM Software stands for “Original Equipment Manufacturer” software. It refers to software which is sold, and bundled with hardware. Microsoft sells its operating system as OEM software to hardware dealers. OEM software is sold at reduced price, without the manuals, packaging and installation instructions. For example, Dell computers are sold with the “Windows 7” OS pre-loaded on them

70) What is Demo Software?

Ans Demo Software is designed to demonstrate what a purchased version of the software is capable of doing and provides a restricted set of features. To use the software, the user must buy a fully- functional version

71) What is a Word Processing Software?

Ans For writing letter, reports, documents etc. (e.g. MS-WORD)

72) What is a Image Processing Software?

Ans : For assisting in drawing and manipulating graphics (e.g. Adobe Photoshop)

73) What is a Spread Sheet Software?

Ans Used for creating budget, tables etc. (e.g. MS-Excel)

74) What is a Web Browser Software?

Ans To access the World Wide Web to search documents, sounds, images etc. (e.g. Internet Explorer, Netscape Communicator, Chrome)

75) What is Geographic Information System?

Ans : It captures, stores, analyzes, manages, and presents data, images and maps that are linked to different locations. (e.g. ArcGIS)

76) Name the Application Software Package having Word Processor, Spreadsheet and Presentation Software?

Ans : Some examples are MS-Office, Google Docs, Sun Openoffice, Apple iWork

77) What is Cloud Computing?

Ans In the simplest terms, cloud computing means storing and accessing data and programs over the Internet instead of your computer's hard drive. The cloud is just a metaphor for the Internet.

78) What is an Operating System?

Ans Any computer system you use has an operating system. The user interacts with the machine via the operating system. A software on the machine interacts with the hardware via the operating system.Operating system (OS) is the software that provides an interface between the computer hardware, and the application programs or users

79) Categories of Operating Systems?

Ans OS are classified into different types depending on their capability of processing—

(1) Single user 
(2) Multiuser 
(3) Multitasking 
(4) Multiprocessing 
(5) Real-time 
(6) Embedded

80) What is  Single User and Single Task Operating System?

Ans Single User and Single Task OS is for use by a single user for a standalone single computer for performing a single task. The operating system for Personal Computers (PC) are single user OS. For example, if the user is editing a document, then a document cannot be printed on the printer simultaneously. Single user OS are a simple operating system designed to manage one task at a time. MS-DOS is an example of single user OS

81) Define Single User and Multi Tasking Operating System?

Ans Single User and Multitasking OS allows execution of more than one task or process concurrently. For this, the processor time is divided amongst different tasks. This division of time is also called time sharing. The processor switches rapidly between processes. For example, the user can listen to music on the computer while writing an article using a word processor software. The user can switch between the applications and also transfer data between them. Windows 95 and all later versions of Windows are examples of multitasking OS

82) MultiUser Operating System?

Ans Multiuser OS is used in computer networks that allow same data and applications to be accessed by multiple users at the same time. The users can also communicate with each other. Linux, UNIX, and Windows 7 are examples of multiuser OS.

83) Multiprocessing Operating system

Ans Multiprocessing OS have two or more processors for a single running process. Processing takes place in parallel and is also called parallel processing. Each processor works on different parts of the same task, or, on two or more different tasks. Since execution takes place in parallel, they are used for high-speed execution, and to increase the power of the computer. 

Linux, UNIX and Windows 7 are examples of multiprocessing OS


84) Real Time Operating Systems

Ans Real-Time OS are designed to respond to an event within a predetermined time. These operating systems are used to control processes. Processing is done within a time constraint. OS monitors the events that affect the execution of process and respond accordingly. They are used to respond to queries in areas like medical imaging system, industrial control systems etc. LynxOS is an example of real time OS

85) Embedded Operating System

Ans Embedded OS is embedded in a device in the ROM. They are specific to a device and are less resource intensive. They are used in appliances like microwaves, washing machines, traffic control systems etc 

86) What is Process Management?

Ans Process management includes handling the scheduling of processes, process synchronization and communication, and deadlock situations

87) What is CPU Scheduler?

Ans CPU scheduler assigns the processor to different processes so that no process is kept waiting for long. Scheduling can be non-pre-emptive scheduling and pre-emptive scheduling

88) What is FCFS?

Ans As the name says, the process that requests for the CPU first, gets the CPU first. A queue is maintained for the processes requesting the CPU. The process first in the queue is allocated the CPU first. FCFS scheduling is non-pre-emptive. The drawback of this scheduling algorithm is that the process that is assigned to the CPU may take long time to complete, keeping all other processes waiting in the queue, even if they require less CPU time

89) What is SJF Scheduling?

Ans Shortest Job First (SJF) Scheduling: The process that requires the least CPU time is allocated the CPU first. SJF scheduling is non-pre-emptive. The drawback of this scheduling is that a process that requires more CPU time may have to wait for a long time since processes requiring less CPU time will be assigned the CPU first.

90) What is RR Scheduling?

Ans Round Robin (RR) Scheduling: It is designed for time-sharing systems. RR scheduling is pre-emptive. In this scheduling, a small quantum of time (10—100 ms) is defined, and each process in the queue is assigned the CPU for this quantum of time circularly. New processes are added at the tail of the queue and the process that has finished execution is removed from the queue. RR scheduling overcomes the disadvantage of FCFS and SJF scheduling. A process does not have to wait for long, if it is not the first one in the queue, or, if it requires CPU for a long period of time

91) What is Memory Management?

Ans Memory management includes memory allocation, de-allocation, re-allocation of free block, and memory protection and sharing.


92) Give Some Examples of Operating Systems?

Ans MS-DOS, Windows XP, UNIX, Linux, and Mac OS X are some examples of OSs.



93) What is Bandwidth?

Ans Bandwidth is the amount of data that can be transferred through the communication medium, in a fixed amount of time. Bandwidth is measured in Hz

94) What is a Modem?

Ans Modem is a device that has both a modulator and a demodulator. Modulator accepts data signals from the computer and modulates the carrier wave accordingly. Demodulator accepts modulated carrier wave and regenerates the original data signal from it. During data communication, modem is attached to the computer, both at the sender and the receiver side. Modems are used with all transmission media like RF modem for RF transmission and optical modem for transmission through fiber optics.


95) What are various Network Types?

Ans Lan - Local Area Network
MAN: Metropoliton Area Network
WAN: Wide Area Network

96) What are the common LAN Topologies?


Ans Bus, Star and Ring


97) What is a Bridge?

Ans Bridge connects two LAN segments and forwards correct frames to the other segment.

98) What is a Wireless Network?

Ans Wireless network is a computer network connected wirelessly. Bluetooth, wireless LAN, and wireless WAN are the three categories of wireless networks


99) What are Twisted Pair Cables?

Ans A twisted pair cable consists of four pairs of twisted copper wires. STP and UTP are the two kinds of twisted pair

100) What are Coaxial Cables?


Ans Coaxial cable has an inner conductor that transmits electric signals and an outer conductor as a ground. Optical fibres transmit data over large distances. They use light signals



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