SAMPLE PAPER WITH SOLUTION 2024
CLASS – XII
INFORMATICS PRACTICES (065)
TIME
03 HOURS M.M.
70
General Instructions:
●
This question paper contains five sections, Section A to E.
SECTION – A
1. Which of the
following topologies is very efficient and all nodes are connected to a central
hub?
a)
Star
b)
Tree
c)
Bus
d) Ring
2. Ramandeep is
a young woman with great aspirations and has a good team of like-minded people.
She along with her team members started a company to sell handicrafts online
and also designed a logo for their company. What type of intellectual property
does this logo represent?
a)
Patents
b)
Copyright
c)
Design
d) Trademark
3. Which of the
following is a type of cybercrime where objectionable and demeaning comments
are posted on social media platform about a person, such that he/she is
mentally harassed?
a)
Phishing
b)
Hacking
c)
Cyber bullying
d) Identity theft
4. Which
of the following is the correct output
of the following SQL command?
SELECT
ROUND(7586.4568, 2)
a)
7876.46
b)
7876.45
c)
7900
d) 7900.4568
5. Aggregate
functions are also known as
a)
Scalar functions
b)
Single row functions
c)
Multiple row functions
d) Hybrid functions
6. head()
function is used to return first ________ rows.
a)
n-1
b)
n+1
c)
n2
d) n
7. Abdul
deleted all his chat from all his social media accounts and he thinks that all
his traces are deleted completely. Is he right in think so?
a)
Yes
b)
No
c)
May be
d) Not sure
8. What is the
correct syntax to return the values of first row of a Pandas DataFrame?
Assuming the name of the DataFrame is dfRent.
a)
dfRent[0]
b)
dfRent.loc[1]
c)
dfRent.loc[0]
d) dfRent.iloc[1]
9. ______
refers to a small, single site network.
a)
DSL
b)
RAM
c)
WAN
d) PAN
10. Which
function returns the length of the string in bytes?
a)
LENGTH()
b)
DATE()
c)
TIME()
d) MATH()
11. A software
which is available for free and the code is open for all, it is called as…………..
a)
Proprietary software
b)
Free and open source software
c)
Free software
d) None of these
12. Which of the following is not a Mathematical function?
a)
LENGTH()
b)
POWER()
c)
MOD()
13. The return
type of POWER() function is
a)
String
b)
Date
c)
Numeric
14. Given a
Pandas Series called sequences, the command which will display the first 4 rows
is ______.
a)
print(sequences.head(4))
b)
print(sequences.Head(4))
c)
print(sequences.heads(4))
d) print(sequences.Heads(4))
15. The correct
output of
SELECT TRIM
(LEADING ‘&’ FROM ‘&&& India &&&&’) ; is
a)
India &&&
b)
India &&&&
c)
&& India
d) &&& India
16. Which of the
following is an example of copyleft license?
a)
GPL
b)
BSD
c)
MIT
d) All of these
17. Assertion
(A) Pandas is an open-source Python library which offers high performance, easy
to use data structures and data analysis tools.
Reason (R)
Professionals and developers are using the Pandas library in data science and
machine learning.
a)
Both A and R are true and R is the correct explanation of A.
b)
Both A and R are true but R is not the correct explanation of A.
c)
A is true but R is false.
d) A is false but R is true.
18. Assertion
(A) The name Bluetooth is derived from Harald Bluetooth, a king in Denmark.
Reason (R)
Bluetooth is used for exchanging data over a short distance from fixed and
mobile device.
a)
Both A and R are true and R is the correct explanation of A.
b)
Both A and R are true but R is not the correct explanation of A.
c)
A is true but R is false.
d) A is false but R is true.
SECTION - B
19. What is the
advantage of using switch over hub?
OR
List two differences between a website and web page.
Ans:
(i) A switch
is faster than a hub.
(ii) A
switch offers full-duplex communication while a hub offers only half-duple.
OR
Web Site
(i) It is a
group of related web pages addressed to a typical URL.
(ii) There
is ot extension used in the URL of a website. Ex - Amazon, Flipkart etc.
Web Page
(i) It is a part of web site which comprises links to other web pages.
(ii) The web page URL has an extension. e.g. Contact pages, registration, login, etc.
20. The Python
code written below has syntactical errors. Rewrite the correct code and
underline the corrections made.
Import pandas as pd
import Numpy
as np
arr =
np.array([1, 2, 3, 4, 5])
my_Series = pd.Series(arr)
print(my_series)
Ans:
import pandas as pd
import numpy
as np
arr =
np.array([1, 2, 3, 4, 5])
my_series = pd.Series(arr)
print(my_series)
21. Complete the
given Python code to create a DataFrame from the following dictionary
‘data_dict’, and print the sum of all the values in the ‘sales’ column.
import
________ as pd
data_dict =
{‘item’ : [‘A’, ‘B’, ‘C’, ‘D’], ‘sales’ : [50, 30, 45, 20]}
df =
pd.DataFrame(_________)
print(df[‘sales’].
________())
Ans:
import
pandas as pd
data_dict =
{‘item’ : [‘A’, ‘B’, ‘C’, ‘D’], ‘sales’ : [50, 30, 45, 20]}
df = pd.DataFrame(data_dict)
print(df[‘sales’]. sum())
22. What will be
the output of the following code:
>>>
import pandas as pd
>>> A = pd.Series(data = [35, 45, 55, 40])
>>> print (A>40)
Ans:
0 False
1 True
2 True
3 False
23. Kiyaan, a
database administrator needs to display house wise total number of records of
‘Blue’ and ‘Green’ house. He is encountering an error while executing the
following query:
SELECT HOUSE, COUNT (*) FROM SCHOOL GROUP BY HOUSE WHERE HOUSE = ‘Blue’ or HOUSE = ‘Green’ ;
Help him in identifying the reason of the error and write the correct query by suggesting possible corrections.
Ans:
The problem
with the given SQL query is that WHERE clause should not be used with GROUP
BY clause. To correct the error, HAVING
clause should be used instead of WHERE.
Correct query is:
SELECT HOUSE, COUNT(*) FROM SCHOOL GROUP BY HOUSE HAVING HOUSE = ‘Blue’ OR HOUSE = ‘Green’ ;
24. Complete the
given Python code to get the required output as 16
import
________ as np
data = [1,
4, 9, 16]
series_data
= np. __________(data)
print(series_data[_______])
Ans:
import numpy
as np
data = [1,
4, 9, 16]
series_data = np.array(data)
print(series_data[3])
25. Write the
output of the given code.
import
pandas as pd
s1=pd.Series([5,
6, 7, 8, 10], index =[‘v’, ‘w’, ‘x’, ‘y’, ‘z’])
a = [2, 6,
1, 4, 6]
s2 =
pd.Series(a, index = [‘z’, ‘y’, ‘a’, ‘w’,
‘v’])
print(s1-s2)
Ans:
a NaN
v -1.0
w 2.0
x NaN
y 2.0
z 8.0
SECTION - C
26. Consider the
table BOOK given below
Table: Book
|
Code |
Title |
Author |
Publication |
Price |
|
D001 |
Physics |
Vikas Sharma |
xxx |
250 |
|
D002 |
Chemistry |
Preeti Goyal |
yyy |
300 |
|
D003 |
Informatics Practices |
Swati Rana |
zzz |
275 |
|
D004 |
English |
Sanjeev Jain |
aaa |
150 |
|
D005 |
Mathematics |
Rajiv Rastogi |
bbb |
400 |
Give the
output of the following commands:
(i) SELECT
SUBSTR(Title, 2, 3) FROM BOOK WHERE CODE = ‘d002’ ;
(ii) SELECT CONCAT
(Author, Publication) FROM BOOK WHERE Price = 250 ;
(iii) SELECT
MAX(Price) FROM BOOK ;
Ans:
(i)
SUBSTR(Title, 2,3)
hem
(ii) CONCAT(Author, Publication)
Vikas Sharmaxxx
(iii) MAX(Price)
400
27. Write a code
to create the following DataFrame:
|
|
Name |
Marks |
Subject |
|
a |
Abhi |
75 |
Maths |
|
b |
Chirag |
82 |
Science |
|
c |
Tushar |
69 |
English |
|
d |
Mahi |
70 |
Science |
|
e |
Vanshika |
92 |
Computer |
Ans:
import
pandas as pd
data =
{‘Name’ : [‘Abhi’, ‘Chirag’, ‘Tushar’, ‘Mahi’, ‘Vanshika’],
‘Marks’ : [75, 82, 69, 70, 92],
‘Subject’ : [‘Maths’, ‘Science’,
‘English’, ‘Science’, ‘Computer’] }
df = pd.DataFrame(data, index = [‘a’, ‘b’, ‘c’, ‘d’, ‘e’])
print(df)
28. Sanyukta is
event incharge in a school. One of her students gave her a suggestion to use
Python Pandas and Matplotlib for analysing and visualising the data,
respectively. She has created a DataFrame “df” to keep track of the number of
First, Second and Third prize won by different houses in various events.
|
|
House |
Frist |
Second |
Third |
|
0 |
Chenab |
5 |
7 |
6 |
|
1 |
Gangas |
10 |
5 |
4 |
|
2 |
Jamuna |
8 |
13 |
15 |
|
3 |
Jhelum |
12 |
9 |
12 |
|
4 |
Ravi |
5 |
11 |
10 |
|
5 |
Satluj |
10 |
5 |
3 |
Help her to
write Python commands to do the following questions:
(i) Display
the House names where the number of Second prize are in the range of 12 to 20.
(ii) Display
all the records in the reverse order.
(iii)
display the bottom 3 records.
Ans:
(i) df [
‘House’][(df [‘Second’ ] > = 12) and (df [ ‘Second’] <= 20)]
(ii)
print(df.iloc[: : -1 ]
(iii) df.tail(3)
29. Consider the
following table CLUB.
Table : CLUB
|
COACH_ID |
COACHNAME |
AGE |
SPORTS |
DATE_OF_JOINING |
PAY |
|
1 |
Rajesh |
30 |
Karate |
1990-08-25 |
1000 |
|
2 |
Anuj |
35 |
Swimming |
2000-01-05 |
750 |
|
3 |
Shuchi |
25 |
Basketball |
2005-01-04 |
1200 |
|
4 |
Reetika |
28 |
Badminton |
2002-08-25 |
1400 |
|
5 |
Virendra |
32 |
Cricket |
1996-05-17 |
1500 |
Write SQL
queries for the following:
(i) To
display the substring of 4 characters of the name of each coach, starting from
second character, with chair age.
(ii) To
display the day for the Date_of_Joining column.
(iii) to
concat the COACHNAME with AGE where age
of coach is above 30 years.
OR
What is the purpose of GROUP BY clause in MYSQL? How is it different from ORDER BY clause.
Ans:
(i) SELECT
SUBSTR(COACHNAME, 2, 4), AGE FROM CLUB ;
(ii) SELECT
DAY(DATE_OF_JOINING) FROM CLUB ;
(iii) SELECT
CONCAT (COACHNAME, AGE) FROM CLUB WHERE AGE > 30 ;
OR
The GROUP BY clause can be used to combined all those records that have identical value in a particular field or a group fields.
Whereas, ORDER BY clause is used to display the records either in ascending or descending order based on a particular field. For ascending order, ASC is used and for descending order DESC is used. The default order is ascending order.
30. Write the
output of following queries:
(i)
mysql> SELECT POWER(9, 3) ;
(ii) mysql> SELECT MID(‘SUCHI GOYAL’ , 8, 5) ;
(iii) mysql> SELECT RIGHT(‘Dushyant’ , 5) ;
Ans:
(i) 729
(ii) GOYAL
(iii) hyant
SECTION - D
31. Zeenat has
created the following DataFrame1 to keep track of data Rollno, Name, Marks1 and
Marks2 for various students of her class, where row indexes are taken as the
default values:
|
Rollno |
Name |
Marks1 |
Marks2 |
|
1 |
Swapnil Sharma |
30 |
50 |
|
2 |
Raj Batra |
75 |
45 |
|
3 |
Bhoomi Singh |
82 |
95 |
|
4 |
Jay Gupta |
90 |
95 |
(a) What
will be the output of the following codes?
(i)
print(dataframe1.size)
(ii)
print(dataframe1[‘Rollno’] ==2)
(b) Write
the code to print the highest marks obtained in Marks1 and Marks2.
(c) Write
the code to add new column “Marks3” with relevant data.
OR (option for part (c) only)
Write the
code for delete the 3rd column.
Ans:
(i) 16
(ii) 2 Raj Batra 75 45
(iii)
print(dataframe1.Marks1.max()), (dataframe1.Marks2.max()))
OR
del
dataframe1[‘Marks1’]
32. A Gift
Gallery has different stores in India. Database Administrator Abhay wants to
maintain database of their Salesman in SQL to store the data.
Consider the
following records in ‘Salesman’ table and answer the given questions.
Table : Salesman
|
Scode |
Sname |
Address |
Dtofjoin |
Sales |
Area |
|
100 |
Sushant |
Delhi |
2017/09/29 |
5000.90 |
East |
|
101 |
sushant |
Gurgaon |
2018/01/01 |
7000.75 |
East |
|
102 |
Priya |
Noida |
2018/04/25 |
3450.45 |
West |
|
103 |
Mohit |
Delhi |
2018/11/03 |
6000.50 |
North |
|
104 |
Priyanshi |
Delhi |
2019/12/25 |
8000.62 |
North |
(i) Display
Sname and Sales of East and West areas.
(ii) Display
the total Sales made in East Area.
(iii) the
command to display the Name of the Salesman along with the Sales amount rounded
off to one decimal point.
(iv) The
command to display the length of salesman name.
Ans:
(i) SELECT
SNAME, SALES FROM SALESMAN WHERE AREA = ‘EAST’ OR AREA = ‘WEST’ ;
(ii) SELECT
SUM(SALES) FROM SALESMAN WHERE AREA = ‘EAST’ ;
(iii) SELECT SNAME, ROUND(SALES, 1) FROM SALESMAN ;
(iv) SELECT LENGTH (SNAME) FROM SALESMAN ;
SECTION - E
33. Write the
output of the following queries:
(i) SELECT
POWER(9, 3) ;
(ii) SELECT
MID(‘SUCHI GOYAL’, 8, 5) ;
(iii) SELECT
RIGHT(‘DUSHYANT’, 5) ;
(iv) SELECT
INSTR(‘SQL FUNCTIONS’, ‘C’) ;
(v) SELECT
LEFT(‘ARIHANT’, 2) ;
OR
Kabir has
created following table exam:
Table: Exam
|
RegNO |
Name |
Subject |
Marks |
|
1 |
Sanya |
Computer Science |
98 |
|
2 |
Sanchay |
IP |
100 |
|
3 |
Vinesh |
Cs |
90 |
|
4 |
Sneha |
IP |
99 |
|
5 |
Akshita |
IP |
100 |
Help him in
writing SQL queries to the perform the following task:
(i) Insert
new record in the table having following values:
[6, ‘Khushi’ , ‘CS’, 85]
(ii) To
change the value ‘IP’ to ‘Informatics Practices’ in subject column.
(iii) To
remove the records of those students whose marks are less than 30.
(iv) To add
a new column Grade of suitable datatype.
(v) To
display records of “Informatics Practices” subject
Ans:
(i) 729
(ii) OYAL
(iii) hyant
(iv) 8
(v) Ar
OR
(i) INSERT
INTO EXAM VALUES(6, ‘KHUSHI’, ‘CS’, 85) ;
(ii) UPDATE
EXAM SET SUBJECT = ‘INFORMATICS PRACTICES’ WHERE SUBJECT = ‘IP’ ;
(iii) DELETE
FROM EXAM WHERE MARKS < 30 ;
(iv) ALTER TABLE EXAM ADD COLUMN GRADE VARCHAR(2) ;
(v) SELECT * FROM EXAM WHERE SUBJECT = ‘INFORMATICS PRACTICES’ ;
34. China
Middleton Fashion is planning to expand their network in India, starting with
tow cities to provide infrastructure for distribution of their products.
The company
has planned to setup their main office in Chennai at three different locations
and have named their offices as Production Unit, Finance Unit and Media Unit.
The company has its Corporate Unit in Delhi.
A rough
layout of the same is as follows:
Approximate
distance between these units is as follows:
|
From |
To |
Distance |
|
Production Unit |
Finance Unit |
70 m |
|
Production Unit |
Media Unit |
15 m |
|
Production Unit |
Corporate Unit |
2112 m |
|
Finance Unit |
Media Unit |
15 m |
In
continuation of the above, the company experts have planned to install the
following number of computers in each of these units.
|
Unit |
Computers |
|
Production Unit |
150 |
|
Finance Unit |
35 |
|
Media Unit |
10 |
|
Corporate Unit |
30 |
(i) Suggest
the kind of network required (out of LAN, MAN, WAN) for each of the following
units.
(a)
Production
Unit and Media Unit.
(b)
Production
Unit and Finance Unit.
(ii) Which
of the following devices will you suggest for connecting all computers with
each of their office units?
(a)
Switch/Hub (b) Modem (c) Telephone
(iii)
Suggest a cable/wiring layout for connecting the company’s local office units
located in Chennai.
(iv) After
setting up the lab and Internet in the lab, company now requires to enable
video and animations to be played on the web browser for it’s employees. Which
browser tool/service can be used for the same.
(v) Give an example of Open Source web browser.
Ans:
(i) (a)
Local Area Network (LAN)
(b) The type of network between Production Unit and Finance Unit is MAN (Metropolitan Area Network)
(ii)
Switch/Hub
(iii) The
cable/wiring layout for connection is as follows:
(iv) Add-one
browser tool/service can be used to enable videos and animations to be played
on the web browser for multimedia class.
(v) Google
Chrome, Firefox
35. The heights of 10 students of eighth grade are given below:
Height_cms=[145,141,142,142,143,144,141,140,143,144]
Write suitable Python code to
generate a histogram based on the given data, along with an appropriate chart
title and both axis labels.
Also give
suitable python statement to save this chart.
OR
Write suitable Python code to create 'Favourite Hobby' Bar Chart as shown below:
Also give
suitable python statement to save this chart.
Ans:
import matplotlib.pyplot as plt
Height_cms=[145,141,142,142,143,143,141,140,143,144]
plt.title("Height Chart")
plt.xlabel("Height in cms")
plt.ylabel("Number of people")
plt.show()
import matplotlib.pyplot as plt
hobby = ('Dance', 'Music', 'Painting', 'Playing Sports')
users = [300,400,100,500]
plt.bar(hobby, users)
plt.title("Favourite Hobby")
plt.ylabel("Number of people")
plt.xlabel("Hobbies")
plt.show()
plt.savefig("hobbies.jpg")
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