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2 Q1.Communication between a computer and a keyboard involves transmission a) Automatic b) Half-duplex c) Full-duplex d) Simplex

3 Transmission modes Transmission modes defines direction of the flow of information between two communication devices Three types of transmission modes simplex Half duplex Full duplex

4 Simplex mode In simplex transmission information is sent only in one direction There is no mechanism for information to be transmitted back to the sender Communication is unidirectional Examples of simplex mode Keyboards and traditional monitors Keyboard can only introduce input and the monitor can only accept output Fire alarms,microphone

5 Half duplex In half duplex transmission data can be sent in both the directions, only one direction at a time Both the connected devices can transmit and receive but not simultaneously When one device is sending the other can only receive

6 Full duplex In full duplex transmission data can be sent in both the directions Both the connected devices can transmit and receive at the same time bidirectional

7 Q2.The first Network a) CNNET b) NSFNET c) ASAPNET d) ARPANET

8 Q3.A set of rules that governs data communication a) Protocols b) Standards c) RFCs d) None of the mentioned

9 TCP/IP It forms the base of present day internet TCP and IP are two protocols of this model TCP stands for the transmission control protocol and IP stands for Internet protocol Initially used by Advanced research project agency network (ARPANET) Four layers Application layer Internet layer Transport layer Host to network layer

10 Q4.Three or more devices share a link in connection a) Unipoint b) Multipoint c) Point to point d) None of the mentioned

12 Q5.A is a device that forwards packets between networks by processing the routing information included in the packet. a) bridge b) firewall c) router d) all of the mentioned

13 What is router: Router is a network layer (Layer 3) of the OSI reference model device that means it can connect multiple computer networks via wired or wireless connections. Network router can receive, analyze, perform the traffic directing functions and forwards data packet from one network to its destination node. Rou

14 Q7.Which of the following produces the best quality graphics reproduction? A. Laser printer B. Ink jet printer C. Plotter D. Dot matrix printer

15 Q8.The feature in database language that allows us to access certain records in database is called. (a) Query (b) Forms (c) Reports (d) Tables

16 9.Which of the following shortcut keys is used to select the entire document? (a) Ctrl + L (b) Alt + A (c) Ctrl + A (d) Shift + A (e) Ctrl + K

17 10.#include is called A. Preprocessor directive B. Inclusion directive C. File inclusion directive D. None of the mentioned

18 11.The C language consist of number of keywords. A] 32 B] 40 C] 24 D] 56

20 12.Which of the following relational algebra operations require the participating tables to be union-compatible? (A) Union (B) Intersection (C) Difference (D) Join

21 1.Union UNION is used to combine the results of two or more Select statements. However it will eliminate duplicate rows from its result set. In case of union, number of columns and datatype must be same in both the tables.

22 Union compatible The union operator requires that both relations are union-compatible. This means that they are required to have the same set of attributes. Note that this concept goes slightly beyond than sharing the same amount of attributes. This is because it also considers the content of the attribute EG: Consider the following relations: Person(FirstName, LastName) Country(Name, Population) In this case, Person and Country are not union-compatible as they do not share the same set of attributes, even though they share the same amount of attributes.

23 13) Which is valid string function? A] strpbrk B] strlen C] strxfrm D] strcut

24 14.What is gutter margin? a) Margin that is added to right margin when printing b) Margin that is added to the left margin when printing c) Margin that is added to the outside of the page when printing d) Margin that is added to the binding side of page when printing

25 15. A supercomputer would be used for which of the following applications? (A) Business computing (B) Desktop computing (C) Weather forecasting (D) Computer aided design

26 16.What is full form of BMP? a) Byte map b) Bit map c) Byte map process d) Bit map process

27 17.What is full form of ISDN? a) Integrated Services Digital Network b) Integrated Services Double Network c) Inter Services Digital Network d) Integrated Server Digital Network

28 18.The data link layer takes the packets from and encapsulates them into frames for transmission. a) network layer b) physical layer c) transport layer d) application layer

29 19.Which one of the following task is not done by data link layer? a) framing b) error control c) flow control d) channel coding

30 20.Automatic repeat request error management mechanism is provided by a) logical link control sublayer b) media access control sublayer c) network interface control sublayer d) none of the mentioned

31 21.SDLC stands for a) Software Development Life Cycle b) System Development Life cycle c) Software Design Life Cycle d) System Design Life Cycle

32 22.Select * from employee.what type of statement is this? a) DML b) DDL c) View d) Integrity constraint

33 23.The metadata is created by the (A) DML compiler (B) DML pre-processor (C) DDL interpreter (D) Query interpreter

34 24.What is data integrity? (A) It is the data contained in database that is non redundant. (B) It is the data contained in database that is accurate and consistent. (C) It is the data contained in database that is secured. (D) It is the data contained in database that is shared.

35 25.Relational Algebra does not have (A) Selection operator. (B) Projection operator. (C) Aggregation operators. (D) Division operator.

36 The fundamental operations of relational algebra are as follows Select Project Union Set different Cartesian product Rename

37 The aggregation operators perform mathematical operations like Average, Aggregate, Count, Max, Min and Sum, on the numeric property of the elements in the collection.

38 26.What is extension of plain text file? a).text b).tt c).txt d).tx

39 27.What is extension of Microsoft Word Document? a).dcc b).doc c).xls d).ppt

Data Communication & Computer Networks MCQ S

Data Communication & Computer Networks MCQ S 1. The translates internet domain and host names to IP address. a) domain name system b) routing information protocol c) network time protocol d) internet relay