Download Marking scheme of IP First Term Paper 2016

FIRST TERMINAL EXAMINATION 2016
CLASS XII
INFORMATICS PRACTICES-MARKING SCHEME
TIME-3 HRS.
GENERAL INSTRUCTIONS:
MM-70
All questions are compulsory. Answer the questions after carefully reading the
text.
1. (a)
Two doctors have connected their mobile phones to transfer a picture file of a
person suffering from a skin disease. What type of network is formed? Which
communication media out of Coaxial cable, Optical fibre, Bluetooth, Satellite
link should be used to transfer the file?
1
A. COMMUNICATION MEDIA – BLUETOOTH
TYPE OF NETWORK - PAN (PERSONAL AREA NETWORK)
(b)
State reasons why Star Topology requires more cable length than Bus
topology.
2
Bus Topology has a main run of linear cable to which all nodes connect whereas in
Star Topology has a central hub or switch to which all nodes need to connect
individually. Hence more the nodes, more the cable length needed. Thus Star
topology requires more cable length than Bus topology.
(c)
“Open Source software developers work for the good of community.” Is this
statement true? Give reasons.
2
Yes, the given statement is true. The reasons to support it are:
-Open source makes available software mostly free of cost, thus within reach of all
segments of society.
-Open source gives freedom to see the code, to learn from it, to improve and modify
it. Thus it spreads values like meritocracy, community building and transparency.
(d)
What happens during “Domain Name Resolution”?
2
Users use URLs (e.g., www.edupillar.com) to connect to websites on Internet,
whereas, Internet applications communicate with one another through IP addresses
(e.g., 182.50.130.158). Domain Name Resolution is the process of conveying URLs or
domain names to their corresponding IP addresses. It works like:
When we enter a URL in our web browser, can browser contacts its DNS server to
resolve this name.
A DNS server is further connected to other DNS servers which recursively search and
then finally return the corresponding IP address.
Using the obtained IP address the web browser can actually connect and open the
desired web site.
(e)
How is “Denial of service” attack, a threat to Network security?
2
Denial-of-service (DoS) attacks that prevent the legitimate users of the system, from
accessing or using the resources, information, or capabilities of the system.
Since DoS attacks forbid a user to use a network, these can be termed as a threat to
Network Security.
(f)
How is firewall useful in ensuring network security.
1
A firewall is a network security system, either hardware – or software-based, that
controls incoming and outgoing traffic based on a set of rules. A firewall grants or
rejects network-traffic flow between Internet and a private or corporate network.
(g)
Name one open source Indian operating system.
BOSS (Bharat Operating Systems Solutions)
1
(h)
What do the following top level domains signify – (i) .com
(ii) .org
2
.com-commercial organizations, .org- non profit organizations.
(i)
Distinguish between MAC address and IP address with the help of example of
each.
2
MAC address refers to the physical address assigned by NIC manufacturer. It is a 6
byte address with each byte separated by colon.
For example, 20: A6: E9: 45: AF: 2E.
IP addresses refers to the logical address (unique) assigned to all machines on a
TCP/IP network. It is a 4 byte address with each byte separated by dot (.) .
For example, 192.168.52.2.
(j)
Distinguish between Phonetic text entry and keymap based entry of typing
Indian Language text.
2
Typing of words as per their pronunciation in English script and later converted to
corresponding language word is known as Phonetic Text Entry.
For example, if we type as
‘mera desh mahan’
It’ll transliterate it as
The mappings of a keyboard’s key to specific characters are known as key map based
Text Entry.
For example, if we press the key horizontally adjacent to capslock key on keyboard,
the letter “a” gets typed. So this key has been mapped to character ‘a’.
(k)
What was the objective behind developing UNICODE?
1
The objective behind developing UNICODE was to have single standard code for all
known languages of the world.
(l)
Expand the term: ODF
1
ODF- open document format
(m)
Identify the following devices:
(i)
A device that is used to connect different types of networks. It
performs the necessary translation so that the connected networks
can communicate properly.
(ii)
A device that converts data from digital bit stream into an analog
signal and vice-versa.
1
Gateway , Modem
Q2.(a) “In e-Business, customers should shop only when they trust the e-store
provider for payment methods”. Justify the statement.
1
In e-business security of transaction is very important in terms of :
- security of personal information
- security of payment transaction (information related to bank account,
credit cards, passwords etc.)
If the personal information and payment related information are securely handled by
an e-business site, then only customers should shop from that e-store.
(b)
How is e-learning beneficial for old people? Write one point.
1
E-learning is beneficial because it gives freedom to learn at own pace and time from
own home.
(c)
How is an e-commerce business more cost effective than traditional business?
Write one point.
1
It requires no brick and mortar office, Can reach globally, Buying and selling speeds
are faster.
(d)
How does e-governance empower citizens? Write one point.
1
e-governance portals have helped citizens by reducing the number of trips to
government offices by nearly 11% to 27%.
(e)
Define e-business. Name one popularly used e-business website.
1
e-business refers to any form of transaction (exchange) that uses an electronic
medium to facilitate the transaction. A popularly used e-business website is :
www.amazon.com
(f)
List two features of a good interface.
1
A good interface has following features:
- It should have pleasant color combination so that the user likes to use it.
-It should have all the relevant options for all the required fields so that the user is at
ease while entering the data.
(g)
What is front-end and back-end? Also give one example for each.
2
FRONT END – This is the user interface that the user sees and which is responsible for
interacting with the user. The front-end is responsible for receiving user’s queries,
requests atc. And passing it over to the back –end. Example, Netbeans.
BACK END – It is that part of the application that does the real processing work or
gets it done from the server. It is responsible for processing data for user queries and
requests.
(h)
Ms. Arora is creating a form for accepting Visa applications. Help her to choose
most appropriate controls out of Listbox, ComboBox, TextField, TextArea,
RadioButton, CheckBox, Label and CommandButton for the following entries:
S.No.
1.
2.
3.
4.
2
Function
To enter EMAIL ID
To choose GENDER
To enter NATIONALITY from countries given as options.
To enter REMARKS in the form of a paragraph about the purpose of
visit.
TEXTFIELD ,
RADIO BUTTON,
LIST BOX ,
TEXT AREA
Q3.(a) What is MySQL?
1
MYSQL is an open source Relational Database Management System.
(b)
Chavi is inserting “Sharma” in the “lastname” column of the table “Emp” but
an error is being displayed. Write the correct SQL statement.
INSERT INTO EMP(‘SHARMA’) VALUES(LASTNAME);
1
INSERT INTO EMP(LASTNAME) VALUES(‘SHARMA’);
(C)
In a table ‘Employee’, a column ‘Occupation’ contains many duplicate values.
Which keyword would you use if you wish to list only different values?
1
DISTINCT
(d)
If you wants to delete the records where the ‘Firstname’ is ‘Rama’ in the Emp
table. Rewrite the correct statement: DELETE ‘RAMA’ FIRSTNAME FROM EMP;
1
DELETE FROM EMP WHERE FIRSTNAME=’RAMA’;
(e)
Name two Group or Aggregate functions of SQL. Also explain the meaning of
one.
SUM() , AVG(), MAX(), MIN(), COUNT(), COUNT(*)
SUM() FUNCTION IS USED TO FIND THE TOTAL OF ALL THE VALUES GIVEN.
1
(f)
Consider the table: COMPANY
COMPANYCODE
C101
C102
C104
C105
1
DONATIONS
13000
NULL
7000
4000
What output will be displayed by the following SQL statement?
Select avg(donations) from company;
8000
(g)
Consider the table below:
TABLE : COMPANY
EMPID
E101
E102
E103
1
DEPARTMENT
PERSONNEL
ACCOUNTS
PERSONNEL
SALARY
60000
65000
52000
Identify error in the following statement. Rewrite the correct SQL statement.
SELECT DEPARTMENT,SALARY FROM COMPANY GROUP BY DEPARTMENT;
SELECT DEPARTMENT, SUM(SALARY) FROM COMPANY GROUP BY DEPARTMENT;
(h)
How is Primary key constraint different from Unique key constraint?
1
A table can have multiple sets of columns with UNIQUE constraint, whereas the
PRIMARY KEY constraint can be only a single set of columns. Also unlike the PRIMARY
KEY constraint the UNIQUE constraint allows NULL values.
(i)
Write one similarity & one difference between CHAR and VARCHAR data type.
1
Both CHAR and VARCHAR types are used to store character string values ranging from
1-255 characters in length, however they behave differently.
CHAR datatype specifies a fixed length character such that strings having length
smaller than the field size are padded on the right with spaces before being stored.
The VARCHAR on the other hand supports variable length strings and therefore
stores actual sizes of strings even if smaller than the field size.
(j)
Given below is the ‘EMP’ table:
ENO
NAME
1
Anita Khanna
2
Bishmeet Singh
SET AUTOCOMMIT=0;
INSERT INTO EMP VALUES(5,’Farzia’);
COMMIT;
UPDATE EMP SET NAME=’Farzziya’ WHERE ENO=5;
SAVEPOINT A;
INSERT INTO EMP VALUES(6,’Richard’);
SAVEPOINT B;
INSERT INTO EMP VALUES(7,’Rajyalakshmi’);
SAVEPOINT C;
ROLLBACK TO B;
What will be the output of the following SQL query now?
SELECT * FROM EMP;
1
ENO
1
2
5
6
NAME
Anita Khanna
Bishmeet Singh
Farzziya
Richard
Q4.(a) Srishti has created the following table with the name ‘VETERINARY’.
Column name
AnimalId
VaccinationsDate
Animal Name
OwnerName
Constraint
Primary key
1
+
1
Not null
One of the rows inserted is as follows:
AnimalId
VaccinationsDate AnimalName
OwnerName
A101
2015-02-12
Sheru
Amit Sharma
(i)
What are the data type of columns AnimalId and VaccinationsDate
in the table Veterinary?
(ii)
Shrishti is now trying to insert the following row:
AnimalId
A102
VaccinationsDate AnimalName
2015-08-09
NULL
OwnerName
Abhi Shah
Will she be able to successfully insert it? Give reason.
i. AnimalId – Char/ Varchar , VaccinationsDate – Date
ii. No, row insertion will not be successful. Reason being that the row being inserted
is violating NOT NULL constraint by trying to insert NULL in AnimalName field.
(b)
Write the output of the following SQL queries:
i)
SELECT MID(‘LEARNINGISFUN’,2,4);
ii)
SELECT ROUND(76.384,2);
iii)
SELECT INSTR(“INFORMATION FORM’,’RM’);
iv)
SELECT DAYOFYEAR(‘2015-01-30’);
i. EARN
(C)
ii. 76.38
iii. 5
2
iv. 30
Table “Order” is shown below. Write commands in SQL for i to iv and output
for v and vi.
orderid
orderdate
salesperson
Orderamount
O101
2015-09-12
Ravi Kumar
34000
O102
2015-08-15
Rashmi Arora
50000
O103
2015-11-01
Ravi Kumar
55000
O104
2015-12-09
Manjeet Singh
60000
O105
2015-11-10
Rashmi Arora
50000
(i)
To display names of salespersons (without duplicates).
(ii)
To list ordered and respective orderamount in descending order of
orderamount.
(iii) To count the number of orders booked by salespersons with names
starting with ‘R’.
(iv) To list order ids, order dates and order amounts that were booked
after 1st September 2015.
(v)
SELECT orderid, orderamount FROM ORDER WHERE orderamount
between 50000 and 60000;
6
(vi)
SELECT concat(ordered, salesperson), length(salesperson) from
order;
i. SELECT DISTINCT SALESPERSON FROM ORDER;
ii. SELECT ORDERID , ORDERAMOUNT FROM ORDER ORDER BY
ORDERAMOUNT DESC;
iii. SELECT COUNT(*) FROM ODER WHERE SALESPERSON LIKE “R%”;
iv. SELECT ORDERID,ORDERDATE,ORDERAMOUNT FROM ORDER WHERE
ORDERDATE>’2015-09-01’;
v.
ORDERID ORDERAMOUNT
O102
50000
O103
55000
O104
60000
O105
50000
vi.
O101Ravi Kumar
10
O102Rashmi Arora 12
O103Ravi Kumar
10
O104Manjeet Singh 13
O105Rashmi Arora 12
(d)
Distinguish between Single Row and Aggregate functions of MySQL. Write one
example of each.
1
Single Row functions work with a single row at a time. A single row function returns a
result for every row of a queried table. For example, pow(), year(), length(), etc.
Aggregate functions work on a number of values of a column / expression and return
a single value as a result. For example, min() , max() , sum(), etc.
(e)
What is the degree and cardinality of table:Order in Q4(c).
1
Degree=4 , Cardinality = 5
(f)
What is the difference between % and _(underscore) wild card characters with
reference to LIKE clause of MySQL.
1
Underscore (_) character matches any one character and percent (%) character
matches any substring when used with LIKE operator for pattern matching in SQL e.g.
LIKE “A_” will match all 2 character values starting with A, but LIKE “A%” will match
all strings having any number of characters but starting with letter A.
(g)
Name the SQL commands used to:
(i)
Physically delete a table from the database.
(ii)
Display the structure of a table.
i. DROP
2
ii. DESC
Q5.(a) Write SQL query to create a table ‘Song’ with the following Structure:
Field
Songid
Title
Duration
Releasedate
Type
Integer
Varchar(50)
Integer
Date
2
Constraint
Primary key
CREATE TABLE SONG( SONGID INTEGER PRIMARY KEY, TITLE VARCHAR(50),
DURATION INTEGER, RELEASEDATE DATE);
(b)
Consider the tables given below:
Table: PARTY
PartyId
Description
P101
Birthday
P102
Wedding
2
CostPerPerson
400
700
P103
P104
Table: CLIENT
CLIENTID
C101
C102
C103
C104
(i)
(ii)
Farewell
Engagement
CLIENTNAME ADDRESS
A K Antony
A-151,
Adarsh
Nagar
Fauzia Aria
K-5/52,
Vikas Vihar
Rashi
D-6, Hakikat
Khanna
Nagar
S K Chandra
76-A/2, MIG
Colony,
Adarsh
Avenue
350
450
PHONE
991019566
NOOFGUESTS PARTYID
80
P101
893466448
500
P102
981166568
50
P101
65877756
100
P104
Name the Primary key in both the tables.
‘P101’ data is present twice in column ‘PartyId’ in ‘Client’ table-Is
there any discrepancy? Give reason for your answer.
i. Table PARTY – Primary Key PartyId , Table CLIENT – Primary Key ClientId
ii. No, it is not a discrepancy because PartyId is not the primary key of table Client.
Thus, there can be duplicate values in it.
(c)
With reference to above tables write SQL commands for i and ii and output for
iii given below:
(i)
To display client names of clients, their phone numbers, partyid and
party description who will have number of guests more than 50 for
their parties.
(ii)
To display client ids, their addresses, number of guests of those
clients who have ‘Adarsh’ anywhere in their addresses.
(iii) SELECT CLIENTID, CLIENTNAME, NOOFGUESTS, DESCRIPTION,
COSTPERPERSON FROM CLIENT, PARTY WHERE CLIENT.PARTYID =
PARTY.PARTYID AND NOOFGUESTS BETWEEN 50 AND 100;
6
i. SELECT CLIENTNAME,PHONE,P.PARTYID,DESCRIPTION FROM PARTY P,
CLIENT C WHERE P.PARTYID=C.PARTYID AND C.NOOFGUESTS > 50;
ii. SELECT CLIENTID, ADDRESS, NOOFGUESTS FROM CLIENT WHERE ADDRESS
LIKE “%Adarsh”;
iii.
C101 A K Antony
80 Birthday
400
C103 Rashi Khanna 50 Birthday
400
C104 S K Chandra 100 Engagement 450
(d)
Write MySQL command to create the table DEPARTMENT:
Column name
Datatype(size)
Constraint
Departmentid
Int(4)
Primary key
Depname
Varchar(50)
Not null
Managerid
Char(4)
location
Varchar(30)
2
CREATE TABLE DEPARTMENT(DEPARTMENTID INTEGER(4) PRIMARY KEY,
DEPNAME VARCHAR(50) NOT NULL, MANAGERID CHAR(4), LOCATION
VARCHAR(30));
(e)
What is the use of commit statement? Why is it different from rollback?
1
COMMIT is used to make changes done by transaction permanent on a database
whereas ROLLBACK un-does the uncommitted changes in the database.
(f)
With reference to tables in Q5.(b) part identify the foreign key.
1
PartyId of CLIENT table.
(g)
Name a function of MySQL which is used to remove trailing and leading spaces
from a string.
TRIM
1