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# CBSE Class 12 Pre Board 2019 : Informatics Practices (St Xavier's Sr. Sec. School, Delhi)

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Pre Board Examination 2019 Std. 12 INFORMATICS PRACTICE 17-01-2019 Max. Marks :70 Time : 3 hrs. 1. a) State two advantages of networking computers instead of having standalone computers. b) What was the objective behind developing UNICODE? c) Expand the following terms: i) WAN ii) OSS d) What is the purpose of switch in a network? e) Identify the following devices: i. An intelligent device that connects several nodes to form a network and redirects the received information only to intended node(s). ii. A device that regenerates (amplifies) the received signal and re-transmits it to its destination. f) What is the name of the network topology in which each node is connected independently using a switch? Draw diagram of that topology. [2] g) What is meant by "Denial of Service" with reference to Internet service? [1] [1] [1] [1] [2] [2] 2.a)Rubina, a class XII student has just started learning java programming. Help her in the following: i. Explain her the concept of variable and data type by suitable example. [2] ii. Help her in understanding the difference between logical operator and comparison operator with the help of appropriate example. [2] b)Will the output from the following two code be any different? [2] First Code : int a=2,b=40; do { jTextField1.setText(""+a); a=a+8; } while(b<=a); Second Code: int a=2,b=40; while(b<=a) { jTextField1.setText(""+a); a=a+8; } Give reasons for your answer. OR Predict the output of the following code: int n=5,f=1,i; for(i=1;i<=n;i++) { f=f*i; } jTextField1.setText(""+f); jTextField2.setText(""+i); c)Amit, a website designer with Anshu Designers Pvt. Ltd. has written the following code. Observe the code given below and answer the following questions: [4] <company> <employee eid=1> <name>Albert</name> <deptdeptid= d1 >Computer</dept> </employee> <employee eid=2> <name>Manisha</name> <deptdeptid= d2 >Accounts</dept> </employee> </company>

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