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    http://www.cbseguess.com/  www.cbseguess.com Other Educational Portals www.icseguess.com | www.ignouguess.com | www.dulife.com | www.magicsense.com | www.niosguess.com | www.iitguess.com  Sample Paper –  2013 Class –  XI Subject  –  COMPUTER SCIENCE   Max Marks 70 Duration 3 hrs  Note:- All questions are compulsory Figures to right indicate full marks Use c++ as programming language This question paper contains 30 questions Q1) a) How is a compiler different from interpreter ? 2  b) Name any one Super Computer developed by India . 1 c) What is an Operating System ? What are its functions ? 3 d) What is significance of Recycle bin ? 2 e) convert (i) ( 2345) 10 = ( ? ) 16  (ii) (0100111010001) 2  =( ? ) 8 2  Q2) a) What do you mean by syntax error? 1  b) Why logical errors are harder to locate? 2 c)Mention different steps in program design 3 d) What is role of comment and indentation in program ? 2 e) How are meaningful identifiers useful ? 2 Q3) a)What will be result of following statements if p=10 , q=10 initially 2 (i) ++p<=10 (ii) q++<=10  b) Write a c++ program to input a number (n). If the number is odd and positive  print its square root otherwise print n 5  3 c) Classify the following variable names of c++ into valid and invalid category 3    http://www.cbseguess.com/  www.cbseguess.com Other Educational Portals www.icseguess.com | www.ignouguess.com | www.dulife.com | www.magicsense.com | www.niosguess.com | www.iitguess.com  (i) 1no (ii) num 1 (iii) num (iv) num1num (v) num+1 (vi) num.1 d)Why iostream.h file is included in every c++ programm ? 2 e) Explain conditional operator (?) with example in c++ . 3 f) Name any two derived data types of c++ . 2 Q4) a) Evaluate x=- -y +2y if y=3 3  b) Give name of header files to which following inbuilt functions belong to . 2 1) exit() 2) strcmp( ) 3) toupper( ) 4) abs( ) c) Find syntax error(s) if any in following program ( Assume all header files are  present) 2 main<> { int c; switch( c ); case 1.5: { cout<<” India is great\ n”;  } break; ‘case’ 2: { cout<<” hello \ n”;  } break; } // end of main } // end of switch d) Define /Declare following given arrays in cpp 1 i)Array named mark with 10 integer values ii)array named avg with 8 float values e) Convert following while loop to for loop 2 int x=0; while(x<=100) { cout<<” This is computer science paper  \ n”;   cout<<”good -bye\ n”;  x+=2; } f ) Which character is statement terminator in cpp ? 1    http://www.cbseguess.com/  www.cbseguess.com Other Educational Portals www.icseguess.com | www.ignouguess.com | www.dulife.com | www.magicsense.com | www.niosguess.com | www.iitguess.com  g) Write a cpp program to compute compound interest 2 h) What is difference between / and % operators in c++ ? 2 i)Give output of following program ( Assume all header files are present) 3 void main( ) { void execute(int &b,int c=100); int M=90, N=10; execute(M); cout<<M<< \t <<N<< \n ; execute(M,N); cout<<M<< \t <<N<< \n ; } void execute(int &b,int c) { int temp=b+c;  b+=temp; if(c==100) cout<<temp<< \t <<b<< \t <<c<< \n ; }  j) What are differences between while loop and do while loop ? 3 k) Explain use of random function in c++ with an example. 3 l) Design a cpp program to define a structure for a student having rollno(int)  percentage (float), grade char. Input and output data for n students 4 m) Write a cpp program to convert a decimal number to binary number 4 n) Give output of following code. 3 #include<iostream.h> int m=5; void check(); void main( ) { int m=20; { int m=10*::m; cout<< m= <<m<< ::m= <<::m<<endl; } check(); cout<< m= <<m<< ::m= <<::m<<endl; check(); cout<< ::m= <<::m<< m= <<m<<endl; } void check() { ++m;    http://www.cbseguess.com/  www.cbseguess.com Other Educational Portals www.icseguess.com | www.ignouguess.com | www.dulife.com | www.magicsense.com | www.niosguess.com | www.iitguess.com  } COMPUTER SCIENCE MARKING SCHEME Q1) a) How is a compiler different from interpreter 2 01 mark each for two correct differences Partial correct answer to be given 01 mark  b) Name any one Super Computer developed by India 1 01 mark each for two correct names c) What is an Operating System ? What are its functions 3 01 mark each for definition 02 marks for functions Partial correct answer to be given appropriate marks d) What is significance of Recycle bin 2 02 mark for correct explanations Partial correct answer to be given 01 mark e) convert (i) ( 2345) 10 = ( ? ) 16  (ii) (0100111010001) 2  =( ? ) 8 2  01 mark each for proper conversion Partial correct answer to be given appropriate marks Q2) a) What do you mean by syntax error? 1 01 mark for correct answer  b) Why logical errors are harder to locate? 2 02 mark for correct explanation Partial correct answer to be given appropriate marks c)Mention different steps in program design 3 1 mark for explanation and 02 marks for different steps Partial correct answer to be given appropriate marks d) What is role of comment and indentation in program ? 2 02 marks each correct explanation Partial correct answer to be given appropriate marks
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