ES II set 1 Date: July 2017 Class XII Sec. Time: 1 1/2 Hrs. Informatics Practices answer key M.M.: 35

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1 ES II set 1 Date: July 2017 Class XII Sec. Time: 1 1/2 Hrs. Informatics Practices answer key M.M.: 35 Name Roll No. Instruction: a) Attempt all questions neatly. 1. (a) A table books has 12 rows and 16 columns. Another table author has 10 rows and 15 columns.what will be the degree and cardinality of the cartesian product of the 2 tables. 1 cardinality 120 degree - 31 (b) Is a primary and Candidate key same. Explain 1 Primary Key: It is a field or collection of fields through which a record can be uniquely identified in a table. Primary keys may consist of a single attribute or multiple attributes in combination. Candidate Key: All attribute combinations in a table that can serve as primary key are called candidate key. They behave the candidate for the primary key. Each table may have one or more candidate keys. All primary keys are candidate keys but all candidate keys are not primary keys. (c) Explain COMMIT, SAVEPOINT with example 2 COMMIT-this statement is used to end a transaction and make all changes permanent. Until a transaction is committed, other users cannot see the changes made to the database. SAVEPOINT-It is point in a transaction, up till which all changes have been saved permanently. d) What is Foreign Key? Create a foreign key and explain 2 Foreign Key: It is a column of a table which is the primary key of another table in the same database. It is used to enforce referential integrity of the data. Create table dept ( Deptnumb int(2) PRIMARY KEY, Deptname varchar(10) ); Create table emp ( Empno int(5) PRIMARY KEY, Empname varchar(30), Deptno int(2), Sal decimal(7,2), foreign key deptno references dept(deptnumb) ); 2 a) Differentiate between list and combo box swing control 2 XII / IP Page 1 of 12

2 List:A list is used to get one or more options out of several given options which may or may not be mutually exclusive. This may seem to be the case wherecheckboxes are to be used, but the difference is in the number of options available. If the number of options is small, then CheckBoxes can be used. In case of large number of options, using CheckBoxes may take up a lot of spaceon the form and it may also be inconvenient for the u ser to select the desiredoptions. In such cases Lists are preferred over checkboxes. Example s of such cases are: To select cities out of a given list of cities, to select magazines out of a given list of magazines, etc. ComboBox: A ComboBox is used to get an option out of several given options which are mutually exclusive. This may seem to be the case where RadioButtons are to beused, but the difference is in the number of options available. If the number ofoptions is small, then Rad iobuttons can be used. In case of large number ofoptions, using RadioButtons may take up a lot of space on the form and it may also be inconvenient for the user to select the desired option. In such casescomboboxes are preferred over radio buttons. Examples of such case s are: To select a city out of a given list of cities, to select a train out of a given list of trains, etc. b) Give the output of the following programs 2 i) i) System.out.print( The ); System.out.println( Air ); System.out.print( Force ); System.out.println( School ); The Air ForceSchool _ ii) System.out.println( The ); System.out.println( Air ); System.out.print( Force ); System.out.println( School ); The Air Force School _ 3. Consider the tables DOCTORS and PATIENTS given below: DOCTORS Doc_ID Doc_Name Department OPD_Days 101 Smita ENT TTS 102 Chelsea Paed MWF 201 Sakshi Ortha MWF PATIENTS Pat_No Pat_Name Department Doc_ID XII / IP Page 2 of 12

1 Neeraj ENT 101 2 Mohit Ortho 201 3 Rahul ENT 101 4 Vivek Ortho 201 With reference of these tables, write commands in SQL for (i) and (ii) and ANSWER THE (iii): (i) Display the Patno, PatName and

3 1 Neeraj ENT Mohit Ortho Rahul ENT Vivek Ortho 201 With reference of these tables, write commands in SQL for (i) and (ii) and ANSWER THE (iii): (i) Display the Patno, PatName and corresponding DocName for each patient. 2 Select patno,patname,docname from doctors,patients where doctors.doc_id=patients.doc_id; (ii) Display the name of all patients whose OPD days are TTS. 2 Select patname from doctors,patients where doctors.doc_id=patients.doc_id and opd_days = TTS ; (iii) NAME THE primary key of doctors and patients table. name the foreign key too. Can the user enter 104 as Doc_id in patients table. If not why? 2 Primary key =doc_id and Pat_no foreign key = doc_id. no because it is violating the referential integrity rule. 4. Infra Keys company has number of employees which are divided into 2 grades as per their basic pay per month which is given as follows 6 Grade 1: Basic : >= Da : 40% of basic Hra : 30% of basic Grade 2: Basic : < Da : 30% of basic Hra : 25% of basic Calculate tax on basis of salary Annual salary Less than tax >= % over The following is the screen used to calculate employee tax XII / IP Page 3 of 12

4 (i) Write the code for calculate button a. To automatically select the grade on the basis of Basic salary entered by the user. b. to find out the DA, HRA, gross(basic+da+hra), Annual Salary (gross*12), Total Tax, Monthly Tax( 1/12 of total tax), and net salary( gross-monthly tax) (a) float bas=float.parsefloat(txt2.gettext()); double da,hra,gross,anlsal,tottax,montax,netsal; if(bas>=150000) { Rb1.setSelected(true); da=0.40*bas; hra=0.30 *bas; } else if(bas<=150000) { Rb2.setSelected(true); da=0.30 * bas; hra=0.25 * bas; } gross=bas+da+hra; anlsal=gross* 12; txt3.settext(" "+da); txt4.settext(" "+hra); txt5.settext(" "+gross); txt8.settext(" "+anlsal); if(anlsal<250000) tottax=0; tottax=0.10*(anlsal ); else tottax=0.10* *(anlsal ); montax=tottax/12; txt6.settext(" "+tottax); txt9.settext(" "+montax); netsal=gross-montax; txt7.settext(" "+netsal); 5. a) Create a table Teacher the database school with the following specification 2 Table : Teacher fieldname datatype size Constraint TNum integer 6 Primary key TNAME char 20 Not null unique TADDRESS varchar 30 Default New mumbai DOJ date SALARY decimal 9,2 Create table teacher (tno int(6) primary key, tname char(20) not null unique, taddress varchar(30) default Mumbai, doj date,salary decimal(9,2)); XII / IP Page 4 of 12

5 b) Consider the table TEACHER given below. Write the commands in SQL for 1 to 4 and output for 5 and 6. 6 TEACHER ID Name Department HireDate Category Gender Salary 1 Anupam Hindi TGT M Divyansh English PRT M Himanshu Arts PGT M Kushal Science TGT M Venkateshwar English PRT M Lakshitta Arts TGT F Tanisha Computer TGT M To display all information about teachers of TGT category who were hired on Wednesday. Select * from teacher where category = TGT and dayofweek(hiredate)= Wednesday ; 2. To display the count of the teachers category wise SELECT category, count(*) FROM TEACHER GROUP BY category; 3. To display names, departments of all the teachers in upper case and in descending order of salary. Select upper(name), upper(department) from teacher order by salary desc; 4. To display the count of the unique departments. SELECT count(distinct(department)) FROM TEACHER; 5. SELECT DISTINCT(Department) FROM TEACHER; DISTINCT(department) Hindi English Arts Science Arts Computer 6. SELECT sum(salary) FROM TEACHER WHERE category= PRT ; sum(salary) (a) Write the name of two commonly used e_commerce portal (b) Explain front end and back end interface. 1 FRONT END INTERFACE: The front end application controls communication between end users. For software applications, front end is the same as user interface. In client/server applications, the client part of the program is often called the front end and the server part is called the back end. A good user interface needs to have following features. Clear:Concise: Familiar: Responsive Consistent: Attractive Efficient BACK END DATABASE: It is a database that is accessed by users indirectly through an external application rather than application programming stored within the database. The back-end of an IT application is the database in which all the data is stored A good back-end ensures sustainability, efficiency and easy modification of the application. (c) Mention the main advantage and disadvantage of e-governance sites 1 1. Positive impact a. It improves the efficiency of administration and service delivery. b. Reduced waiting time for the work completion. XII / IP Page 5 of 12

6 c. Reduced the cost of availing the service. d. Successful in keeping a tab on corruption to some extent. e. Increased public participation. 2. Negative Impact a. People living in rural or remote area could not benefited due to lack of computerization. b. Manual methods cannot be avoided. c. Lack of awareness amongst people. (d ) Mention the swing control to make a form which will perform the following tasks 2 Sl no Control used to Swing control 1 Select subject/subjects List 2 Give a picture label 3 To select your train number Combo Box 4 To select the newspapers you like to read List XII / IP Page 6 of 12

7 WT II Set 2 Answer key Date: July 2017 Class XII Sec. Informatics Practices Time: 1 1/2 hrs. M.M.: 35 Name Roll No. Instruction: c) Attempt all questions neatly. 1. (a) A table stud has 8 rows and 4 columns. A table user has 13 rows and 8 columns. Give the degree and cardinality of the Cartesian product of these tables 1 c-104 D-12 (b) Is a primary and Unique key same. Explain 1 No. The unique constraint is same as primary key but can accept NULL values. The UNIQUE and PRIMARY KEY constraints both guarantee for uniqueness of a column or set of columns. (c) What is Foreign Key? Create a foreign key and explain. 2 Foreign Key: It is a column of a table which is the primary key of another table in the same database. It is used to enforce referential integrity of the data. Create table dept ( Deptnumb int(2) PRIMARY KEY, Deptname varchar(10) ); Create table emp ( Empno int(5) PRIMARY KEY, Empname varchar(30), Deptno int(2), Sal decimal(7,2), foreign key deptno references dept(deptnumb) ); (d) What effect does SET AUTOCOMMIT have in transactions? 2 If AUTOCOMMIT is set to 1, each SQL statement is considered a complete transaction and committed by default when it finishes. If AUTOCOMMIT is set to 0, the subsequent series of statements acts like a transaction and no transaction is committed until an explicit COMMIT statement is issued. XII / IP Page 7 of 12

8 2. (a) Differentiate between Radio Button and Combo Box swing control? 1 When from multiple options we are required to select one option, then radio buttons wing control is used and when more options have to be selected then check box is used. Both are used as input box. For each radio button in a program one button group is to be at design time. (b) Give one method of password swing control. Name the property through which we can change the character which is displayed in a password field. 1 getpassword() echochar (c) Give the output of the following programs 2 i) System.out.println( The ); System.out.print( Air ); System.out.print( Force ); System.out.println( School ); The Air Force School _ ii) System.out.println( The ); System.out.println( Air ); System.out.println( Force ); System.out.print( School ); The Air Force School _ 3. In a Database BANK, there are two tables with a sample data given below: Table: EMPLOYEE ENO ENAME SALARY ZONE AGE GRADE DEPT 1 Mona EAST 40 A 10 2 Muktar West 45 B 20 3 Nalini East 26 A 10 4 Sanaj South 30 A 20 5 Surya North 30 B 30 XII / IP Page 8 of 12

Write SQL queries for the following Table: DEPARTMENT DEPT DNAME HOD 10 Computers 1 20 Economics 2 30 English 5 (i) To display ENO, ENAME, SALARY and corresponding DNAME of all the employees whose

9 Write SQL queries for the following Table: DEPARTMENT DEPT DNAME HOD 10 Computers 1 20 Economics 2 30 English 5 (i) To display ENO, ENAME, SALARY and corresponding DNAME of all the employees whose age is between 25 and 35 (both values inclusive) 2 Select ENO,ENAME,SALARY,DNAME from EMPLOYEE E, DEPARTMENT D where E.DEPT = D.DEPT and AGE between 25 and 35 ; (ii) To display DNAME and corresponding ENAME from the tables DEPARTMENT and EMPLOYEE. 2 Select DNAME,ENAME from EMPLOYEE E, DEPARTMENT D where D.HOD = E.ENO ; (iii) To display ENAME, SALARY, ZONE and INCOME TAX (Income Tax to be calculated as 30% of salary) and give appropriate column headings. 2 Select ENAME, SALARY, ZONE, SALARY * 0.3 INCOMETAX from EMPLOYEE ; 4. a) Give the code to disable the TxtBillDate, TxtDisc and TxtFinal textfields 2 TxtBillDate.setEnabled(false); TxtDisc.setEnabled(false); XII / IP Page 9 of 12

10 TxtFinal.setEnabled(false); b) Write the code for the CmdCalc button to display the discount and final price in the TxtDisc, and TxtFinal text fields respectively. Note that Final price is calculated as price - discount and the discount is calculated based on the category and price according to the following table. Also remember to give an additional 5% discount for membership card holders i.e. if the ChkMember checkbox is selected. 4 Category Price Discount Men's < % >= % Women's < % >= % Kid's <500 20% >=500 30% float Price=float.parseFloat(TxtPrice.gettext()); if (OptMens.getSelected()==true) { if (price<1000) disc=0.3; else disc=0.5; } else if (Optwomens.getSelected()==true) { if (price<1500) disc=0.4; else Optkids.getSelected()==true) disc=0.5; } else { if (price<500) disc=0.2; else disc=0.3; } if (ChkMember.getSelected()==true) Disc=disc+0.05 TxtDisc.setText( +disc); TxtFinal.setText( +price-price*disc); 5 (a) Create a table Computer lab with the following specification 2 XII / IP Page 10 of 12

11 Column Name Data Type Size Constraint It_Code NUMBER 4 PRIMARY KEY It_Cat CHAR.. It_Name VARCHAR 25 NOT NULL It_Cost NUMBER 8,2 It_Qty NUMBER 3 Dt_Pur Date CREATE TABLE CompLab ( It_Code NUMBER(2) PRIMARY KEY, It_Cat CHAR, It_Name VARCHAR2(30) NOT NULL, It_Cost NUMBER(8, 2), It_Qty NUMBER(3), Dt_Pur Date ); 4. Write SQL commands for (a) to (d) and give the output for (e) and (f) 6 Table: STUDENT NO NAME STREAM AVGMARK GRADE CLASS dateofadm 1 Smita MEDICAL 89.2 A Kush COMMERCE 78.5 B Anupam HUMANITIES 64.4 C Ashtang COMMERCE 67.5 C Siddharth MEDICAL 92.0 A a) To display total avgmark grade wise. Select sum(avgmark) from student group by grade; b) To display name of those students who got admission on a Friday. Select name from student where dayofweek(dateofadm)= Wednesday ; c) To display maximum AVGMARK for each stream. Select max(avgmark) from student group by stream; d) To display name and stream of students of class 12 in upper case. Select upper(name),upper(stream) from student where class=12; e) SELECT LEFT(NAME, 2) FROM STUDENT WHERE NAME LIKE S% ; LEFT(NAME, 2) Sm Si f) SELECTcount( DISTINCT(STREAM)) FROM STUDENT; count( DISTINCT(STREAM)) 3 XII / IP Page 11 of 12

12 3 (a) Write the name of two commonly used e_governance portal (b) Explain impact of ICT on society. 1 Impact of ICT on society Social networking sites help people to remain in touch with their near and dears Social networking sites help people to work together for social cause E-Governance sites help them to save their time,energy and cost. E-learning sites help student to get quality study material and research on any topic. Helps in conservation of fuel and environment. (c) What is the impact of e_learning sites on student learning process. 1 Societal Impacts: 1. Positive impact a. Self paced. b. fast updation. c. Not time bound. It is available 24 X 7. d. Increased retention and stronger grasp of subject as visual impact is always more than audio impact. e. Unbound by space i.e. study at home f. Easily manageable. g. Travel time and associated cost (parking, fuel, vehicle maintenance)are reduced or eliminated hence cost effective h. Enhances computer and Internet skills. 2. Negative Impact a. Issues related to Technology. b. Inappropriate content. c. Reduced social and cultural interactions. (d ) Mention the swing control to make a form which will perform the following tasks 2 Sl no Control used to Swing control 1 Take the Name as input Text Field 2 To enter NATIONALITY from all the nationalities given as CB options 3 Select subject/subjects List 4 To enter AGE between a range 20 to 25 RB XII / IP Page 12 of 12

ES II Set 1 Date: 20 th July 2018 Class XII Sec. Time: 1 1/2 Hrs. Informatics Practices answer key M.M.: 35

ES II Set 1 Date: 20 th July 2018 Class XII Sec. Time: 1 1/2 Hrs. Informatics Practices answer key M.M.: 35 Name Roll No. Instruction: a) Attempt all questions neatly. b) All Parts of the same question