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Question Bank Solutions for CBSE (Commerce) Class 12 - CBSE - Computer Science (Python)

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Observe the following tables VIDEO and MEMBER carefully and write the name of the RDBMS operation out of (i) SELECTION (ii) PROJECTION (iii) UNION (iv) CARTESIAN PRODUCT, which has been used to produce the output as shown below. Also, find the
Degree and Cardinality of the final result.

TABLE: VlDEO

VNO VNAME TYPE
F101 The Last Battle Fiction
C101 Angels and Devils Comedy
A102 Daredevils Adventure

TABLE: MEMBER

MNO MNAME
M101 Namish Gupta
M102 Sana Sheikh
M103 Lara James

TABLE: FINAL RESULT

VNO VNAME TYPE MNO MNAME
F101 The Last Battle Fiction M101 Namish Gupta
F101 The Last Battle Fiction M102 Sana Sheikh
F101 The Last Battle Fiction M103 Lara James
C101 Angels and Devils Comedy M101 Namish Gupta
C101 Angels and Devils  Comedy M102 Sana Sheikh
C101 Angels and Devils  Comedy M103 Lara James
A102 Daredevils Adventure M101 Namish Gupta
A102 Daredevils Adventure M102 Sana Sheikh
A102 Daredevils Adventure M103 Lara James

 

[3] Python - Databases and SQL
Chapter: [3] Python - Databases and SQL
Concept: Relational Data Model

What kind of data gets stored in cookies and how is it useful ?

[5] Python - Communication Technologies
Chapter: [5] Python - Communication Technologies
Concept: Internet

Write SQL queries for (i) to (iv) and find outputs for SQL queries (v) to (viii) which are based on the table.

TABLE: Account

ANO ANAME ADDRESS
101 Nirja Singh Bangalore
102 Rohan Gupta Chennai
103 Ali Reza Hyderabad
104 Rishabh Jain Chennai
105 Simran Kaur Chandigarh

TABLE: TRANSACT

TRNO ANO AMOUNT TYPE DOT
T001  101 2500 Withdraw 2017-12-21
T002 103 3000 Deposit 2017-06-01
T003  102 2000 Withdraw 2017-0S-12
T004  103 1000 Deposit 2017-10-22
T005  101 12000 Deposit 2017-11-06

1) To display details of all transaction of TYPE Depos1t from Table TRANSACT.

2) To display the ANO and AMOUNT of all Depos1ts and Withdrawals done in the month of October 2017 from table TRANSACT.

3) To display the last date of the transaction (DOT) from the table TRANSACT for the Accounts having ANO as 103

4) To display all ANO, ANAME and DOT of those persons from tables ACCOUNT and TRANSACT who have done transactions less than or equal to 3000?

5) SELECT ANO, ANAME FROM ACCOUNT WHERE ADDRESS NOT IN ('CHENNAI', 'BANGALORE');

6) SELECT DISTINCT ANO FROM TRANSACT

7) SELECT ANO, COUNT(*), MIN(AMOUNT) FROM TRANSACT GROUP BY AND HAVING COUNT(*) > 1;

8) SELECT COUNT(*), SUM(AMOUNT) FROM TRANSACT WHERE DOT <= '2017-06-01'

[3] Python - Databases and SQL
Chapter: [3] Python - Databases and SQL
Concept: Structured Query Language Advantages of Using SQL

State any one Absorption Law of Boolean Algebra and verily it using truth table.

[4] Python - Boolean Algebra
Chapter: [4] Python - Boolean Algebra
Concept: Truth Tables (Boolean Algebra)

Observe the following table MEMBER carefully and write the name of the RDBMS operation out of (i) SELECTION (ii) PROJECTION (iii) UNION (iv) CARTESIAN PRODUCT, which has been used to produce the output as shown in RESULT. Also, find the Degree and Cardinality of the RESULT :

MEMBER

NO MNAME STREAM
M001 JAYA SCIENCE
M002 ADITYA HUMANITIES
M003 HANSRAJ SCIENCE
M004 SHIVAK COMMERCE

RESULT

NO MNAME STREAM
M002 ADI'l'YA HUMANITIES
[3] Python - Databases and SQL
Chapter: [3] Python - Databases and SQL
Concept: Structured Query Language Advantages of Using SQL

Write SQL queries for (i) to (iv) and find outputs for SQL queries (v) to (viii), which are based on the tables.

DVD

DCODE DTITLE DTYPE
F101 Henry Martin Folk
C102 Dhrupad Classical
C101 The Planets Classical
F102 Universal Soldier Folk
R102 A day in life Rock

MEMBER

MID NAME DCODE ISSUEDATE
101 AGAM SINGH R102 2017-11-30
103 ARTH JOSEPH F102 2016-12-13
102 NISHA HANS C101 2017-07- 24

1) To display all details from the table MEMBER in descending order of ISSUEDATE

2) To display the DCODE and DTITLE of all Folk Type DVDs from the table DVD.

3) To display the DTYPE and number of DVDs in each DTYPE from the table DVD.

4) To display all NAME and ISSUEDATE of those members from the table. MEMBER who have DVDs issued (i.e., ISSUEDATE) in the year 2017

5) SELECT MIN(ISSUEDATE) FROM MEMBER

6) SELECT DISTINCT DTYPE FROM DVD;

7) SELECT D.DCODE, NAME, DTITLE FROM DVD D, MEMBER M WHERE D.DCODE=M.DCODE;

8) SELECT DTITLE FROM DVD WHERE DTYPE NOT IN ("Folk", "Classical" ) ;

[3] Python - Databases and SQL
Chapter: [3] Python - Databases and SQL
Concept: Structured Query Language Advantages of Using SQL

Consider the following DEPT and EMPLOYEE tables. Write SQL queries for (i) to (iv) and find outputs for SQL queries (v) to (viii).

Table: DEPT

DCODE DEPARTMENT LOCATION
D01 INFRASTRUCTURE DELHI
D02 MARKETING DELHI
D03  MEDIA MUMBAI
D04  FINANCE KOLKATA
D05  HUMAN RESOURCE MUMBAI

Table: EMPLOYEE

ENO NAME DOJ DOB GENDER DCODE
1001 George K 2013-09-02 1991-09-01 MALE D01
1002 Ryma Sen 2012-12-11 1990-12-15 FEMALE D03
1003 Mohitesh 2013-02-03 1987-09--04 MALE D05
1007 Anil Jha 2014-01-17 1984-10-19 MALE D04
1004 Manila Sahai 2012-12-09 1986-11-14 FEMALE D01
1005 R SAHAY 2013-11-18 1987-03-31 MALE D02
1006 Jaya Priya 2014-06-09 1985-06-23 FEMALE D05

Note: DOJ refers to the date of joining ·and DOB refers to the date of Birth of employees

1) To display Eno, Name, Gender from the table EMPLOYEE in ascending order of Eno.

2) To display the Name of all the MALE Employees from the table EMPLOYEE.

3) To display the Eno and Name of those employees from the table EMPLOYEE who are born between '1987-01-01' and '1991-12-01'.

4) To count and display FEMALE employees who have Joined after '1986-01-01'.

5) SELECT COUNT(*), DCODE FROM EMPLOYEE GROUP BY DCODE HAVING COUNT(*)>1;

6) SELECT DISTINCT DEPARTMENT FROM DEPT;

7) SELECT NAME, DEPARTMENT FROM EMPLOYEE E, DEPT D WHERE E.DCODE=D.DCODE AND EN0<1003;

8) SELECT MAX(DOJ), MIN(DOB) FROM EMPLOYEE;

[3] Python - Databases and SQL
Chapter: [3] Python - Databases and SQL
Concept: Structured Query Language Advantages of Using SQL

Verify the following using Boolean Laws : U'+V = U'V'+ U' .V + U.V

[4] Python - Boolean Algebra
Chapter: [4] Python - Boolean Algebra
Concept: Commutative Law

Differentiate between communication using Optical Fiber and Ethernet Cable in context of the wired medium of communication technologies.

[5] Python - Communication Technologies
Chapter: [5] Python - Communication Technologies
Concept: Optical Fiber

State DeMorgan's Laws of Boolean Algebra and verify them using a truth table.

[4] Python - Boolean Algebra
Chapter: [4] Python - Boolean Algebra
Concept: DeMorgan’S Law/Theorem and Their Applications

Hi-Standard Tech Traj.ning Ltd. is a Mumbai based organization which is expanding its office set-up to Chennai. At Chennai office compound, they are planning to have 3 different blocks for Admin, Training and Accounts related activities. Each block has a number of computers, which are required to be connected in a network for communication, data and resource sharing.

As a network consultant, you have to suggest the best network related solutions for them for issues/problems raised by them in (i) to (iv), as per the distances between various blocks/locations and other given parameters.

Shortest differences between various blocks/locations:

Admin Block to Accounts Block 300 Metres
Accounts Block to Training Block 150 Metres
Admin Block to Training Block 200 Metres
MUMBAI Head Office to CHENNAI Office 1300 Km

The number of computers installed at various blocks is as follows:

Training Block 150
Accounts Block 30
Admin Block 40

1) Suggest the most appropriate block/location to house the SERVER in the CHENNAI office (out of the 3 blocks) to get the best and effective connectivity. Justify your answer.

2) Suggest the best-wired medium and draw the cable layout (Block to Block) to efficiently connect various blocks within the CHENNAI office compound.

3) Suggest a device/software and its placement that would provide data security for the entire network of the CHENNAI office.

4) Suggest a device and the protocol that shall be needed to provide wireless Internet access to all smartphone/laptop users in the CHENNAI office

[5] Python - Communication Technologies
Chapter: [5] Python - Communication Technologies
Concept: Network Devices - Modem, RJ45 Connector, Ethernet Card, Router, Switch, Gateway, Wifi Card

Differentiate between packet switching over message switching

[5] Python - Communication Technologies
Chapter: [5] Python - Communication Technologies
Concept: Network Devices - Modem, RJ45 Connector, Ethernet Card, Router, Switch, Gateway, Wifi Card

Derive a Canonical POS expression for a Boolean function FN, represented by the following truth truth table:

X y z FN (X, Y, Z)
0 0 0 1
0 0 1 1
0 1 0 0
0 1 1 0
1 0 0  1
1 0 1 0
1 1 0 0
1 1 1 1
[4] Python - Boolean Algebra
Chapter: [4] Python - Boolean Algebra
Concept: Obtaining Sum of Product (SOP) and Product of Sum (POS) Form the Truth Table

Differentiate bel ween Bus Topology and Star Topology of Networks

[5] Python - Communication Technologies
Chapter: [5] Python - Communication Technologies
Concept: Network Topologies and Types - Bus, Star, Tree, PAN, LAN, WAN, MAN

What are the advantages and disadvantages of Star Topology over Bus Topology

[5] Python - Communication Technologies
Chapter: [5] Python - Communication Technologies
Concept: Network Topologies and Types - Bus, Star, Tree, PAN, LAN, WAN, MAN

CASE STUDY BASED QUESTION

Ayurveda Training Educational Institute is setting up its centre in Hyderabad with four specialised departments for Orthopedics, Neurology and Pediatrics along with an administrative office in separate buildings. The physical distance between these department buildings and the number of computers to be installed in these departments and administrative office are given as follows.

Shortest distance between various locations in meters:

Administrative Office to Orthopedics Unit 55
Neurology Unit to Administrative Office 30
Orthopedics Units to Neurology Unit 70
Pediatrics Unit to Neurology Unit 50
Pediatrics Unit to Administrative Office 40
Pediatrics Unit to Orthopedics Unit 110

Number of Computers installed at various locations are as follows

Pediatrics Unit 40
Administrative Office 140
Neurology 50
Orthopedics Unit 80

1) Suggest the most suitable location to install the main server of this institution to get efficient connectivity.

2) Suggest the best cable layout for effective network connectivity of the building having server with all the other buildings.

3) Suggest the devices to be installed in each of these building for connecting computers installed within the building out of the following

  • Gateway
  • Modem
  • Switch

4) Suggest the topology of the network and network cable for efficiently connecting each computer installed in each of the building out of the following:

Topologies: Bus Topology, Star Topology

Network Cable: Single Pair Telephone Cable, Coaxial Cable, Ethernet Cable

[5] Python - Communication Technologies
Chapter: [5] Python - Communication Technologies
Concept: Network Topologies and Types - Bus, Star, Tree, PAN, LAN, WAN, MAN

Derive a Canonical POS expression for a Boolean function G, represented by the following truth table:

X Y Z G(X, Y, Z)
0 0 0 0
0 0 1 0
0 1 0 1
0 1 1 0
1 0 0 1
1 0 1 1
1 1 0 0
1 1 1 1

 

[4] Python - Boolean Algebra
Chapter: [4] Python - Boolean Algebra
Concept: Obtaining Sum of Product (SOP) and Product of Sum (POS) Form the Truth Table

Derive a Canonical POS expression for a Boolean function F, represented by the following truth table

P Q R F(P,Q,R)
0 0 0 1
0 0 1 0
0 1 0 0
0 1 1 1
1 0 0 1
1 0 1 0
1 1 0 0
1 1 1 1

 

[4] Python - Boolean Algebra
Chapter: [4] Python - Boolean Algebra
Concept: Obtaining Sum of Product (SOP) and Product of Sum (POS) Form the Truth Table

illustrate the layout for connecting 5 computers in a Bus topology of Networks

[5] Python - Communication Technologies
Chapter: [5] Python - Communication Technologies
Concept: Network Topologies and Types - Bus, Star, Tree, PAN, LAN, WAN, MAN

illustrate the layout for connecting 5 computers in a star topology of Networks

[5] Python - Communication Technologies
Chapter: [5] Python - Communication Technologies
Concept: Network Topologies and Types - Bus, Star, Tree, PAN, LAN, WAN, MAN
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