CBSE Computer Science sample paper5 Class XII 2009

http://www.cbseguess.com/-------------------------------------------------------------------------------------------------------www.cbseguess.com Other Educational Portals www.icseguess.com | www.ignouguess.com | www.dulife.com | www.magicsense.com SAMPLE PAPER -2009 Introductory Computer Science (083) CLASS – XII Time allowed : 3 hours Maximum marks : 70 Note : i) All the questions are compulsory . ii) Programming Language : C++ . 1. a) What is self referential structure? Explain through example. 2 b) Name the header files, to which the following built-in functions belong : 1 i) random( ) ii) toupper( ) c) Rewrite the following program after removing all the syntactical errors underlining each correction. (if any) 2 #include #include #include class club { int memnum=23; char mname[30]; char mtype[ ]; public: void inclub( ) { cin>>memnum>>mname>>mtype; } void outclub( ) { cout< #include void FUN(char *str) { int L,i,j; L=strlen(str); for(i=90;i>=65;i--) for(j=0;j #include void main() { clrscr(); int i,j,sum=0; i=3; while(i*2<15) { j=1; while(j%i!=0) http://www.cbseguess.com/-------------------------------------------------------------------------------------------------------www.cbseguess.com Other Educational Portals www.icseguess.com | www.ignouguess.com | www.dulife.com | www.magicsense.com { sum+=j; j++; } cout< #include void main() { int N,Guessnum; randomize(); cin>>N; Guessnum=random(N-8)+38; cout<>srno>>price; gets(model); } void Display( ){ cout<=7124; b) SELECT AVG(AGE) FROM CLUB WHERE TYPE=”Yearly” OR TYPE=”Quarterly”; 6. a) State and verify idempotent law. 2 b) If F(w,x,y,z) =  (0,3,4,5,6,7,8,11,12,15), obtain the simplified form using K-Map. 3 c) Represent AND operation using NOR gate(s) only. 1 d) Write the SOP form of a Boolean function G, which is represented in a truth table as follows : 1 A B C R 0 0 0 1 0 0 1 0 0 1 0 0 0 1 1 0 1 0 0 1 1 0 1 1 1 1 0 0 1 1 1 1 e) Draw the circuit diagram for the following Boolean expression : 1 (A+B)(A’+B)(A+B’) 7. a) Differentiate between uploading & downloading. 1 b) Expand ISDN & SMTP. 1 c) What is the importance of URL in networking? 1 d) Define the term bandwidth. Write unit of bandwidth. 1 e) The Ever Mind organization has set up its new branch at Amritsar for its office and web based activities. It has 4 wings of buildings which are as follows : Center to center distances between various blocks Wing X to Wing Z 40 m Wing Y to Wing Z 60 m Wing X to Wing Y 135 m Wing Y to Wing U 70 m Wing X to Wing U 165 m Wing U to Wing Z 80 m Number of computers Wing X 50 Wing Y 130 http://www.cbseguess.com/-------------------------------------------------------------------------------------------------------www.cbseguess.com Other Educational Portals www.icseguess.com | www.ignouguess.com | www.dulife.com | www.magicsense.com Wing U 40 Wing Z 15 i) Suggest a most suitable cable layout of connection among the wings and topology. 1 ii) Suggest the most suitable place to house the server of this organization with a suitable reason with justification. 1 iii) Suggest the placement of the following devices with justification :a) Switch/Hub b) Repeater 1 iv) The organization is planning to link its head office situated in Delhi with the offices as Amritsar. Suggest a way to connect it, the cost is not the factor. 1 Best of Luck for your Board Examination……. Paper Submitted by: Pradumna Singh Email :-sirpradumna@rediffmail.com Phone No. 09935559725