Question

class 12 jac board me computer science ke important topic and question 2018 ke liye bataiye

Answer 1

1. (a) What do you understand by objectoriented approach ?                                  2 

(b) Name the header file, to which following built-in function belong to :               2 
      (i) strcmp()                 (ii) tolower() 
     (iii) sin()                      (iv) sqrt() 

(c) Find the syntax error(s), if any, in the program :                                                  2

include<stream.h> 
void main() 
{ 
int k; 
cin<<k; 
for(k<5;k=0; k++) 
cout>>k; 
}

(d) Give the output of the following program :                                                           2

#include<iostream.h> 
void main() 
{ 
int a=9; 
cout<<a%2<<a/2; 
}

(e) Write the output of the following program:                                                         3

#include<iostream.h> 
void main() 
{ 
int i; 
for(i=1;i<=10;i++) 
{ 
cout<<10<<’’X’’<<i<<’’=’’<<i*5<<endl; 
} 
}

(f) Write a program in C++ to find the odd numbers between 1 to 100.                     4

2. (a) What do you understand by the term destructor in C++ ?                                 2

    (b) What do you understand by default constructor ? What is its role ?                  2

    (c) Write a program in C++ to calculate the following expression :                          2 
                    S = n (n + 1) / 2

    (d) Write a program in C++ to calculate the following series :                                  4 
                    

    (e) Write a program in C++ to generate Fibonacci numbers between 1 to 100 (using constructor). 5

3. (a) Define the ‘main operations data structure’.                                                    2

    (b) Give some examples of queue-application.                                                        2

    (c) Write postfix and prefix expressions for the following expression :                   3 
                        A + B – C / D

    (d) Write an algorithm to delete an element from a queue.                                   4

    (e) Write an algorithm to sort the data in ascending order using insertion sort.    5

4. (a) What is a key ? Define primary key.                                                                    2

    (b) What is normalization ? Define ‘second normal form’.                                        2

    (c) Give SQL statement to create table called employee with columns specified below :              1 
             Ecode NUMBER (4) 
             Ename CHAR (16) 
             Salary NUMBER (7,2)

    (d) Give SQL statement to display all Employees Names whose Salary is less than 6000 from the table Employee. 1

    (e) Give SQL statement to display Ecode and Ename from the table Employee in ascending order of their Salary. 1

    (f) Give SQL statement to find the average Salary from the table Employee.          1

5. (a) Explain the following gates using truth table and circuit :                                  2 
           (i) NOR                   (ii) XOR

    (b) What is an adder ? Prepare the truth table of Full Adder.                                   2

    (c) What are the basic postulates of Boolean algebra ?                                             2

    (d) Minimize the following function using a Karnaugh Map :                                    2 
                      F(X,Y,Z) = Σ(4,5,6,7)

6. (a) Define :                                                                                                                2 
              (a) Server                      (b) node

    (b) What is E-mail ? Write down the steps to create e-mail.                                     2

    (c) What are the different types of networks ?                                                         2

    (d) Give the full form of the following :                                                                     2 
            (i) HTML                                    (ii) TCP.