CBSE Class 12 Informatics Practices 2025 Sample Paper Solved Set 4

Section-A

1 State whether the following statement is True or False:
DataFrame has both rows and columns.

Answer : True

2 With reference to SQL, identify the invalid data type:
a) Date
b) Integer
c) Float
d) Month

Answer : d

3 Identify the networking device responsible for connecting device to internet for data transmission.
a) Modem
b) Hub
c) Repeater
d) Router

Answer : a

4 Identify the SQL command used to delete a row from a relation(table).
a) DROP
b) REMOVE
c) DELETE
d) ERASE

Answer : c

5 In India, e-waste management assumes greater significance because:
a) Generation of own e-waste
b) Dumping of e-waste from developed countries
c) Lack of awareness
d) All of these

Answer : d

6 DataFrames can be created from?
a) lists
b) dictionaries
c) series
d) all of the above

Answer : d

7 The command used to give a heading to a graph is:
a) plt.show()
b) plt.plot()
c) plt.xlabel()
d) plt.title()

Answer : d

8 State whether the following statement is True or False:
In SQL, the COUNT()and COUNT(*) always give different result for any relation. 1

Answer : False

9 Which of the following Python statements is used to send data to a CSV file from a Pandas DataFrame df?
a) df.to_csv('filename.csv')
b) df.write_csv('filename.csv')
c) pd.dump_csv('filename.csv')
d) pd.import_csv('filename.csv')

Answer : a

10 Intellectual property is legally protected by
a) copyright
b) patent.
c) trademarks
d) all of these.

Answer : d

11 Fill in the Blank
To specify the condition with a GROUP BY clause _______ clause is used:
a) USE
b) WHERE
c) HAVING
d) LIKE

Answer : c

12 In which of the network topologies do all devices connect through a main wire called backbone?
a) Star
b) Bus
c) Tree
d) Mesh

Answer : b

Please refer to attached file for CBSE Class 12 Informatics Practices 2025 Sample Paper Solved Set 4