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CHSE PREVIOUS YEAR QUESTION WITH ANSWER
Solution of 2018 question paper
1. (a) (i) Demodulation
(b) )Primary key
(c) (ii) 32
(d) (ii) Attributes
(e) i) Encryption
(f (i) Newsgroup
(g) (iv) Eclipse
(i) Firewall
(h) Rows
g) (iv) pkg
2. (a) SMTP: SIMPLE MODE TRANSFER PROTOCOL
(b) IDE: INIEGRATED DEVELOPMENT ENVIRONMENT
(c) OLE OBJECT LINKING& EMBEDDING
(d) MAC :MEDIA ACCESS CONTROL
(e) PSTN : PUBLIC SWITCHED TELEPHONE NETWORK
( f)DML:DATA MANIPULATION LANGUAGE
(g) MTNL - MAHANAGAR TELEPHONE NIGAM LIMITED
(h) SQL: STRUCTURED QUERY LANGUAGE
(i) B2C: BUSINESS-TO-CONSUMER
(j)DHTML: DYNAMIC HYER TEXT MARKUP LANGUAGE
GROUP-B
3.(a)DCL commands
Ans. DCL is short name of Data ControlLanguage which includes commands such as GRANT and mostly concerned with rights, permissions and other controls of the database system.allow users access privileges to GRANT databasewithdraw users access privileges REVOKE given by using the Grant command.
b) Public-key encryption
Ans. Public-key encryption is a cryptographic system that uses two keys - a public keyknown to everyone and a private or secret key known only to the recipient of the message.
(c) Broadband
Ans. Broadband is a type of high-speed internet connect that has surpassed dial-up as the standard way to connect to the internet.Broadband packages come in all shapes and sizes,from ADSL broadband to cable broadband and 3Gand 4G mobile broadband.A broadband connection, like a telephone line, is never switched off and can be accessed at any time.
(d) Instance variable
Ans. In object-oriented programming with classes, an instance variable is a variable defined in a class (i.e. a member variable ), for which each instantiated object of the class has a separate copy. An instance variable is similar to a classvariable.
(e) XML
Ans. XML is the Extensible Markup Language.lt improves the functionality of the Web by letting you Identify your information in a more accurate, flexible,and adaptable way.lt is extensible because it is not a fixed format like HTML (which is a single, predefined markup language). Instead, XML is a metalanguage - alanguage for describing other languages- which letsyou design your own markup languages for limitless different types of documents. XML can do this because it's written in SGML, the international standard metalanguage for text document markup (lISO 8879).
(f) Protocol
Ans. It is a digital language through which we communicate with others on the Internet. protocol meaning is that it aset of mutually accepted and implemented rulesat both ends of the communications channel for the proper exchange of information.
(g) Electronic Data Exchange (EDE)
Ans. Electronic data interchange (EDI) isthe concept of businesses electronically communicating information that was traditionally communicated on paper The two classic examples of such informationare purchase orders and invoices. Technical standardsfor EDI exist to facilitate parties transacting such instruments without having to make special arrangements.
(h) Public variable
Ans. A class, method, constructor, interface, etc.declared public can be accessed from any other class.Therefore fields, methods, blocks declared inside a public class can be accessed from any class belonging to the Javauniverse.Example:public int x;
(i) ORDER BY clause
Ans. An ORDER BY clause in SQL specifiest that a SQL SELECT statement returns a result set with the rows being sorted by the values of one or more columns. The sort criteria do not have to be involved in the result set. The sort criteria can be instantiated object of the class has a separate copy.An instance variable is similar to a class variable.
(j)Switch
Ans. A s witch is used to network multiplecomputers together. Switches made for the consumer market are typically small, flat boxes with 4 to 8Ethernet ports. These ports can connect to computers,cable or DSL modems, and other switches. High-end switches can have more than 50 ports and often arerack mounted.
(k) Firewall
Ans. A firewall is a network security system designed to prevent unauthorized access to or from aprivate network. Firewalls can be implemented as bothhardware and software, or a combination of both.Network firewalls are frequently used to preventunauthorized Internet users from accessing privatenetworks connected to the Internet, especiallyintranets. All messages entering or leaving the intranetpass through the firewall, which examines eachmessage and blocks those that do not meet thespecified security criteria.
(l)www
Ans. Collection of internet resources (such asFTP, telnet, Usenet), hyperlinked text, audio, and video files and remote sites that can be accessed andsearched by browsers based on standards such asHTTP and TCP/IP. Also called the web, it was createdin 1989 by the UK physicist Tim Berners-Lee whileworking at the European Particle Physics Laboratory(called CERN after its French initials ConseilEuropeende ReserchesNucleaires) in Switzerland, as an easierway to access information scattered across theinternet.
4.(a)What is Back-end database ?
Ans. The back-end, or the "server-side", isbasically how the site works, updates and changes.This refers to everything the user can't see in the browser, like databases and servers. Usually people who work on the back-end are called programmers ordevelopers. Back-end developers are mostly worried about things like security, structure and content management. They usually know and can use HTML and CSS, but that's definitely not the focus.
(b) Is a NULL value same as zero or a blankspace ? If not then what is the difference?
Ans. NULL basically means no value, orunknown, it is not to be confused with 0 which is anumeric value by itself. NULL value could be eitherempty, meaningless, or not even initialized. For eg-when we say, bonus is 0, it means the person is notgetting any bonus. But if we say bonus is NULL, we are not sure, what it does mean. It could be no Bonus applicable or some junk value or not defined. 0 is a definitive integer, NULL on the other hand is simply void.
(c) List three features of Java.
Ans. Three features of java
Platform Independent
A program or technology is said to be platform independent if and only if which can run on all available operating systems with respect to its development and compilátion. (Platform represents O.S).
Simple
It is simple because of the following factors:It is free from pointer due to this execution time of application is improved. [Whenever we write a Java program without pointers then internally it is converted into the equivalent pointer program
It has Rich set of API (application protocol interface).It has Garbage Collector which is alwaysused to collect un-Referenced (unused)location Memory for aproving performance of a Java program.It contains user friendly syntax for developing any applications.
High performance
It have high performance because of following reasons,This language uses Bytecode which is faster than ordinary pointer code so Performane of this language is high.Garbage collector, collect the unused memory space and improve the performance of the application.It has no pointers so that using this language we can develop an application very easily.It support multithreading, because of this time consuming process can be reduced to executing the program.