CBSE Class 12 Marking Scheme 2021 for Informatics Practices

Class XII
INFORMATICS PRACTICES (065)
SAMPLE QUESTION PAPER (2020 - 21)
Marking Scheme

Max. Marks: 70 Time: 3 hours

Section A Total
Questi
on No.
1 i. True 1
ii. False

½ mark for each correct answer
2 plt.title() 1

1 mark for correct answer

3. 50 1

1 mark for the correct answer

4 print(Sequences.head(4)) 1

1 mark for the correct usage of head()

5 print(S1+S2) 1

1 mark for the correct print() statement

6 histogram 1

1 mark for the correct answer

7 Firewall 1

1 mark for the correct answer

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8 column 1

1 mark for the correct answer

9 Bug 1

1 mark for the correct answer

10 Dynamic web page 1

1 mark for the correct answer

11 Aggregate Function 1

1 mark for the correct answer

12 Plagiarism 1

1 mark for the correct answer

13 isnull() 1

1 mark for the correct answer

14 Cookies 1

1 mark for the correct answer

15 c. Avast 1

1 mark for the correct answer

16 1
spam

1 mark for the correct answer
17 Buy environmentally friendly electronics 1
Donate used electronics to social programs
Reuse , refurbish electronics
Recycling e-waste
Any other correct answer to be considered

1 mark for the correct answer

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18 1
update

1 mark for the correct answer
19 Select now(); 1

1 mark for the correct answer

20 Switch 1

1 mark for the correct answer
21 Spam or spamming 1

I mark for the correct answer
22.(i) b. print(df.max()) 4

1 mark for the correct answer
(ii) a. df1=df[df[‘rollno’]==4]
print(df1)

d. df1=df[df.rollno==4]
print(df1)

½ mark for mentioning option(a)

½ mark for mentioning option(d)
(iii)

a. both (i) and (ii)

1 mark for stating option “a” as correct answer ½ mark for staing option
“b” as correct answer

(iv) a. d. print(df.columns)

1 mark for the correct answer
(v) b. df [‘Grade’]=[’A’,’B’,’A’,’A’,’B’,’A’]
1 mark for the correct answer
23 (i) b. Both (iii) and (iv) 4

select name from student where city=”Agra” or
city=”Mumbai”;
or

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select name from student where city IN(“Agra”,
“Mumbai”);

d. Only (iii)
iii. select name from student where city=”Agra” or
city=”Mumbai”;

1 mark for stating option b as correct answer
½ mark for stating d as correct answer

(ii)
b.

Rollno Name Class DOB Gender City Marks
6 Maakhiy XI 12/12/94 F Dubai 256
7 Neha X 8/12/95 F Moscow 324
3 Geet XI 6/5/97 F Agra 470
4 Preeti XII 8/8/95 F Mumbai 492

1 mark for the correct answer

(iii) d. Select class, max(marks) from student group
by class;

1 mark for the correct answer

(iv) b. Both (ii) and (iv)

Select gender, average(marks) from student group
by gender where class=”XI”;
or
Select gender, average(marks) from student group
by gender having class = “XI”;

1 mark for the correct answer

(v) b. select name,max(DOB) from student ;

1 mark for the correct answer

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Section B

24 import pandas as pd 2
m1=pd.Series([45,65,24,89],index=['term1','term2','t
erm3','term4'])

½ mark for import statement
½ mark for usage of Series ()
½ mark for stating index as a list
½ mark for creating object m1

25 Differences between single row functions and multiple row 2
functions.
(i) Single row functions work on one row only whereas multiple
row functions group rows
(ii) Single row functions return one output per row whereas
multiple row functions return only one output for a specified
group of rows.

OR
The order by clause is used to show the contents of a
table/relation in a sorted manner with respect to the column
mentioned after the order by clause. The contents of the
column can be arranged in ascending or descending order.

The group by clause is used to group rows in a given column and
then apply an aggregate function eg max(), min() etc on the
entire group.
(any other relevant answer)

Single row v/s Multiple row functions
1 mark for each valid point

Group by v/s Order by
1 mark for correct explanation
1 mark for appropriate example

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26 i. select round(8459.2654); 2
ii.select round(8459.2654,-2);

1 mark each for correct answer of part (i) , (ii)
27 i. print(S_amt[S_amt>250]) 2

ii. S_amt.name= 'Furniture'

1 mark each for correct answer of part (i) , (ii)
28 This is because the column commission contains a NULL value 2
and the aggregate functions do not take into account NULL
values. Thus Command1 returns the total number of records in
the table whereas Command2 returns the total number of non
NULL values in the column commission.
29 2
a. select substr("Preoccupied", 4);
or
select substring("Preoccupied", 4);
or
select mid("Preoccupied",4);
or
select right(("Preoccupied"”, 8);

b. select substr("Preoccupied" ,6,3);
or
select substring("Preoccupied", 6,3);
or
select mid(("Preoccupied" ,6,3);

OR

a. select instr 'Preoccupied' , ‘ 'cup'));
b. select left 'Preoccupied',4);

1 mark for each correct answer of part (a) , (b)

30 i. classframe[‘Activity’]=[‘Swimming’,’Dancing 2
’,’Cricket’, ‘Singing’]
ii. classframe.loc[‘St5’]=[1,’Mridula’, ‘X’,
‘F’, 9.8, ‘Science’]

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1 mark for each correct answer

31 a. SMTP: Simple Mail Transfer Protocol 2
b. POP: Point to Point Protocol
c. FTP: File Transfer Protocol
d. VoIP: Voice over Internet Protocol

½ marks for each correct full form

32 The continuous use of devices like smartphones, computer 2
desktop, laptops, head phones etc cause a lot of health hazards
if not addressed. These are:
i. Impact on bones and joints: wrong posture or long hours of
sitting in an uncomfortable position can cause muscle or bone
injury.
ii. Impact on hearing: using headphones or earphones for a
prolonged time and on high volume can cause hearing problems
and in severe cases hearing impairments.
iii. Impact on eyes: This is the most common form of health
hazard as prolonged hours of screen time can lead to extreme
strain in the eyes.
iv. Sleep problem: Bright light from computer devices block a
hormone called melatonin which helps us sleep. Thus we can
experience sleep disorders leading to short sleep cycles.

2 marks for any two correct points

33 We call this type of activity as Digital Footprints 2

Risk involved :
It includes websites we visit emails we send, and any information we
submit online,
etc., along with the computer’s IP address, location, and other
device specific details. Such data could be used for targeted
advertisement or could also be misused or exploited.

1 mark for naming the activity
1 mark for mentioning any one risk .

34 a. will give the output as: 3
[20,40,90,110,20,40,90,110]

b. will give the output as
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0 40
1 80
2 180
3 220

Justification: In the first statement x represents a list so when
a list is multiplied by a number, it is replicated that many
number of times.
The second y represents a series. When a series is multiplied by
a value, then each element of the series is multiplied by that
number.

1 mark for output of list multiplication
1 mark for output of Series multiplication
1 mark for the justification
35 Identity theft is the crime of obtaining the personal or financial 3
information of another person for the sole purpose of assuming
that person's name or identity to make transactions or use it to
post inappropriate remarks , comments etc.
Example:
Alex likes to do his homework late at night. He uses the
Internet a lot and also sends useful data through email to many
of his friends. One Day he forgot to sign out from his email
account. In the morning, his twin brother, Flex started using
the computer. He used Flex’s email account to send
inappropriate messages to his contacts

Or any other relevant example

1 ½ mark for explaining Identity theft
1 ½ nark for suitable example

OR
Net Ettiquets refers to the proper manners and behaviour we
need to exhibit while being online.

These include :
1. No copyright violation: we should not use copyrighted
materials without the permission of the creator or owner. We
should give proper credit to owners/creators of open source
content when using them.
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2. Avoid cyber bullying: Avoid any insulting, degrading
or intimidating online behaviour like repeated
posting of rumours, giving threats online,
posting the victim’s personal information,
or comments aimed to publicly ridicule a victim.

Or any other relevant answer.

1 marks for deifition of Net Ettiquettes
1 mark eachfor the example with explanation.

36 import matplotlib.pyplot as plt 3
plt.plot([2,7],[1,6])
plt.show()
alternative answer
import matplotlib.pyplot as plt
a = [1,2,3,4,5,6]
b = [2,3,4,5,6,7]
plt.plot (a,b)
1 mark for the import statement
1 mark for appropriate usage of plot()
1 mark for show()

OR

import matplotlib.pyplot as plt
Classes = ['VII','VIII','IX','X']
Students = [40,45,35,44]
plt.bar(classes, students)
plt.show()

1 mark for the import statement
1 mark for appropriate usage of pie()
1 mark for show()

37 a. select Type, avg(Price) from Vehicle group by 3
Type having Qty>20;
b. select Company, count(distinct Type) from
Vehicle group by Company;
c. Select Type, sum(Price* Qty) from Vehicle
group by Type;

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a. ½ mark for the Select with avg(), ½ mark for the having
clause
b. ½ mark for the Select with count() , ½ mark for group by
clause
c. ½ mark for the Select with sum() , ½ mark for the group
by clause

38 5
import pandas as pd
d1={'B_NO':[1,2,3,4],
'Name':["Sunil Pillai","Gaurav
Sharma","Piyush Goel","Kartik
Thakur"],'Score1':[90,65,70,80],
'Score2':[80,45,95,76]
}
df=pd.DataFrame(d1)
print(df)
df['Total'] = df['Score1']+ df['Score2']
Alternative Answer
Scheme
df['Total'] = sum(df['Score1'], df['Score2'])
print(df)
print("Maximum scores are : " ,
max(df['Score1']), max(df['Score2']))
1 mark for import statement
2 marks for creating the dataframe
1 mark for creating column Total to hold the sum
of scores
1 mark for displaying highest scores in Score1 &
Score2
39 i) monthname(date(now())) 5
ii) trim(“ Panaroma “)
iii) dayname(date(dob))
iv)instr(name, fname)
v) mod(n1,n2)
1 mark for each correct answer

OR

i) Select sname, round(bonus,0) from Salesman;

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ii) Select instr(Sname, “ta”) from Salesman;
iii) Select mid(Sname,2,4) from Salesman;
alternative answer
iii) Select Substring(Sname,2,4) from Salesman;
iv) Select monthname(DateofJoin) from Salesman;
v) Select dayname(DateofJoin) from Salesman;
1/2 mark each for correct usage of Select and round()
1/2 mark each for correct usage of Select and instr()
1/2 mark each for correct usage of Select and substr()
1/2 mark each for correct usage of Select and monthname()
1/2 mark each for correct usage of Select and dayname()

Note : Instead of substr() , substring() may be accepted as
correct

40. i) Most suitable layout according to distance is : 5

W1 W2

W3 W4

1 mark for an appropriate cable layout
ii) Star Topology
1 mark for correct topology
iii) Broadband.
1 mark for suggesting suitable technology

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iv). a. Not required. Repeaters may be skipped as per above
layout (because distance is less than 100 m)
b. In every wing

½ mark for placement of repeater ½ mark for placement of hub
/ switch
iv) Radio Waves
1 mark for the appropriate connectivity mode between HQ and
other offices

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