Question Bank Class XII Subject : Computer Science

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Frederick Armstrong
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1 Question Bank Class XII Subject : Computer Science Q1. What is the difference between call by reference & call by value method in a user defined function in C++? Explain it with suitable example. Q.2.Write the names of the header files, which is/are essentially required to execute the following functions: i) isdigit( ) ii) sin( ) iii)gets() iv)open() v) seekg() Q.3. Rewrite the following program after removing all the syntactical errors (if any), underlining each correction. include<iostream.h> typedef char[40] string; void main( ) string S= Australia ; L=strlen(S); cout<< String <<S<< has <<L<< Characters <<endl; } Q 4. Give the output of the following program ( Assuming that all required header files are included in the program ) #define i 5 class TEMP static int a; float b; TEMP( ) b=10; } void INTEMP( ) a++; b=a+10; } void OUTTEMP( ) cout<<a*i<<"$"<<b-3<<endl; } }; int TEMP::a=2; void main() TEMP ob[5]; for(int x=1;x<5;x++) ob[x].intemp( );

2 for(x=1;x<5;x++) ob[x].outtemp( );} Q. 5. Give the output of the following program ( Assuming that all required header files are included in the program ) : #include<iostream.h> #include<stdio.h> #include<conio.h> void TRANSFER(char *s1,char *s2) int n,j=0; for(int i=0;*(s1+i)!='\0';i++) n=*(s1+i); if(n%2==0) *(s2+j++)=*(s1+i); } } void main() char *p="charlesbabbage",q[80]; TRANSFER(p,q); cout<<q<<endl;} Q. 6.Go through the following c++ code, find out the correct possible output(s) from the suggested output options i) to iv). Also write the highest value which can be assigned to variable G : #include<iostream.h> #include<stdlib.h> void main( ) randomize( ); int G,H=5; G=random(H)+30; for(int i=35;i>g;i--) cout<<i<< $ ; cout<<i; } 1. 35$34$33$32$31$30$ 2. 35$34$33$32$ $31$32$33$34$35$ $34$33$32$31$30 Q. 7. What is constructor overloading? Support your answer with example Q. 8. Answer the questions (i) and (ii) after going through the following class : class BUS

3 private: char Pname[30],TicktNo[20]; float Fare; BUS( ) //function 1 strcpy(pname, \0 ); strcpy(ticktno, \0 ); Fare=0; } void Details( ) //function 2 cout<<pname<<endl<<ticktno<<endl<<fare<<endl; } BUS(char * name, char *tno, float N); //function 3 BUS(BUS &F); // function 4 }; 1. In OOP, what is function 3 referred to as? Also define this function. 2. Define function 4 and write about its purpose? Q. 9.Answer the questions (1) to (4) based on the following class Student private : char Rollno[20], Sname[30]; protected : auto float marks; Student( ); void ENROL( ); void SHOW( ); }; class Graduate: public Student char Fname[30]; protected: unsigned int age; Graduate( ); void GENROL( ); void GSHOW( ); }; class Pgraduate: private Graduate char Mname[25]; signed int year; Pgraduate( ); void PGENROL( );

4 }; void PGSHOW( ); 1. Mention the member names that are accessible by an object of Pgraduate class. 2. Name the data members which can be accessed by the objects of Graduate class. 3. Name the data members that can be accessed by the functions of Pgraduate class. 4. How many bytes will be occupied by an object of class Pgraduate? Q10 An array PP[40]32] is stored in the memory along the row with each of the elements occupying 10 bytes. Find out the memory location for the element PP[18][22], if the element PP[7][10] is stored at memory location Q11 Write functions to perform PUSH & POP operations in a dynamically allocated stack containing the objects of the following structure: struct NODE char name[30]; float fees; NODE *next; }; Q12 Consider the class class QUEUE private: int data[20],front,rear; QUEUE( ) front=rear=-1; } void INSQ(int d); //to insert an element into queue void DELQ( ); //to delete an element from the queue void PRINTQ( ); //to print the current status of queue }; Complete the definition of function DELQ( ) of above class. Q13. Evaluate the following postfix notation of expression 30, 6, 4, +, /, 14, +, 4, * Q14. Write a function to delete a record on the given model number for a TV from the binary file TV.DAT containing the objects of TV (as defined below) :

5 class TV long model; float size; char brand[30],comp[30]; long retmodel( ) return model; } void Input( ) cin>>model>>size; gets(brand); gets(comp); } void Output( ) cout<<model<<size<<brand<<comp<<endl; } }; Q15 What do you understand by Primary Key and Alternate Key. Explain with example Q16. Consider the following table GAMES and PLAYER. Write SQL commands for the statements (i) to (iv) and give outputs for SQL queries (v) to (viii). Table : GAMES GAMENAME NUMBER PRZMONEY SCHDATE GCODE 101 Chess Jan Badminton Nov Carrom Mar Table Tennis Jan Basketball Apr 2009 Table : PLAYER NAME GCODE PCODE 1 Rakesh Srivastava Nilesh Mishra Vandana Ravi Jindal to display the details of those games which are having prize money less than and organized before to display the name of PLAYERS in reverse alphabetical order. 3. to increase the prize money by 1000 for those games which name starts with B. 4. Insert an additional attribute namely DOB for entering date of birth in table PLAYER. 5. SELECT GAMENAME,NAME FROM GAMES G,PLAYER P WHERE G.GCODE=P.GCODE

6 6. SELECT MIN(SCHDATE), MAX(PRZMONEY) FROM GAMES ; 7. SELECT AVG(PRZMONEY) FROM GAMES WHERE SCHDATE< 01-JAN ; 8. SELECT COUNT(DISTINCT NUMBER) FROM GAMES; Q17 If F(P,Q,R,S) = π (0,2,4,5,6,7,8,10,11,12,14), obtain the simplified form using K-Map. Q18 (a). What do you understand by Primary Key (b). Consider the following tables Employee and salary. Write SQL commands for the statements (i) to (iv) and give outputs for SQL queries (v) to (viii) Table : Employee Eid Name Deptid Qualification Sex 1 Deepali Gupta 101 MCA F 2 Rajat Tyagi 101 BCA M 3 Hari Mohan 102 B.A M 4 Harry 102 M.A M 5 Sumit Mittal 103 B.Tech M 6 Jyoti 101 M.Tech F Table : Salary Eid Basic DA HRA Bonus a. To display the frequency of employees department wise. b. To list the names of those employees only whose name starts with H c. To add a new column in salary table. the column name is total_sal.

7 d. To store the corresponding values in the total_sal column. e. Select name from employee where eid=(select eid from salary where basic= (select max(basic) from salary)); f. select max(basic) from salary where bonus >40; g. Select count(*) from employee group by sex; h. select Distinct deptid from Employee; Q. 19. (a) State and prove the Distributive law algebraically. (b). Write the equivalent POS expression of following SOP form F (x,y,z)= (0,2,4,6) (c). Draw the Logical circuit of the following expression with the help of NAND gate only x+yz (d). Obtain the simplified form of a Boolean expression using K-Map. F(a,b,c,d)= (0,1,2,3,4,7,11,12,14) Q. 20(a). What do your understand by Hackers? (b). Differentiate between Internet & Intranet (c). Expand the following terminology : 1. SMS 3.GPRS 5.CDMA 2. FTP 4 GSM 6.FSF (d). Define Repeater. (e). A company in Reliance has 4 wings of buildings as shown in the diagram:

8 Center to center distances between various Buildings: W3 to W1 50m W1 to W2 60m W2 to W4 25m W4 to W3 170m W3 to W2 125m W1 to w4 90m Number of computers in each of the wing: W1 150 W2 15 W3 15 W4 25 Computers in each wing are networked but wings are notnetworked. The company has now decided to connect the wings also. i. Suggest a most suitable cable layout & topology of the connection between the wings. ii. The company wants internet accessibility in all the wings. Suggest an economic technology. iii. Suggest the placement of the following devices with justification if the company wants minimized network traffic a)repeater b)hub c)switch d)bridge iv. The company is planning to link its head office situated in India with the offices at Reliance. Suggest a way to connect it; the company does not want to compromise with the speed of connectivity. Justify your answer.

COMPUTER SCIENCE

Final 2012-13 COMPUTER SCIENCE - 083 (Theory) CLASS XII Time allowed : 3 hours Maximum marks: 70 Instructions : i) All the questions are compulsory. ii) Programming Language : C++. 1. a) What is the difference