Science (English Medium) Class 12 - CBSE Important Questions for Informatics Practices

Explain the following SQL function using a suitable example.

POWER()

Shreya, a database administrator has designed a database for a clothing shop. Help her by writing answers to the following questions based on the given table:

1. Write a query to display cloth names in lowercase.
2. Write a query to display the lowest price of the clothes.
3. Write a query to count the total number of clothes purchased in medium size.
   OR
   Write a query to count the year-wise total number of clothes purchased.

To display the last five rows of a series object ‘S’, you may write ______

Which of the following statement will import pandas library?

Which of the following can be used to specify the data while creating a DataFrame?

Assertion (A): DataFrame has both a row and column index.

Reasoning (R): A DataFrame is a two-dimensional labelled data structure like a table of MySQL.

Write a program to create a series of objects using a dictionary that stores the number of students in each house of class 12D of your school.

Note: Assume four house names are Beas, Chenab, Ravi, and Satluj having 18, 2, 20, and 18 students respectively and pandas library has been imported as pd.

What will be the output of the following code:

>>>import pandas as pd
>>>A = pd.Series(data = [35, 45, 55, 40])
>>>print(A > 45)

Carefully observe the following code:

import pandas as pd
Year1 = {'Q1':5000,'Q2':8000,'Q3':12000,'Q4': 18000} Year2 = {'A' :13000,'B':14000,'C':12000}
totSales = {1:Year1,2:Year2}
df = pd.DataFrame(totSales)
print(df)

Answer the following:

1. List the index of the DataFrame df
2. List the column names of DataFrame df.

Write a Python code to create a DataFrame with appropriate column headings from the list given below:

[[101,'Gurman',98], [102,'Rajveer',95], [103,'Samar' ,96], [104,'Yuvraj',88]]

Consider the given DataFrame ‘Stock’:

Write suitable Python statements for the following:

1. Add a column called Special_Price with the following data: [135,150,200,440].
2. Add a new book named ‘The Secret' with a price of 800.
3. Remove the column Special_Price.

Mr. Som, a data analyst has designed the DataFrame df that contains data about Computer Olympiad with ‘CO1’, ‘CO2’, ‘CO3’, ‘CO4’, and ‘CO5’ as indexes shown below. Answer the following questions:

1. Predict the output of the following python statement:
   i. df.shape
   ii. df[2:4]
2. Write a Python statement to display the data of the Topper column of indexes CO2 to CO4.
   OR
   Write a Python statement to compute and display the difference of data of the Tot_students column and First_Runnerup column of the above given DataFrame.

Write Python code to plot a bar chart for India’s medal tally as shown below:

Also, give a suitable python statement to save this chart.

Write a python program to plot a line chart based on the given data to depict the changing weekly average temperature in Delhi for four weeks.

Week=[1,2,3,4]
Avg_week_temp=[40,42,38,44]

Which of the following is not an example of a browser?

Assertion (A): Internet cookies are text files that contain small pieces of data, like a username, password, and user preferences while surfing the internet.

Reasoning (R): To make browsing the Internet faster & easier, it is required to store certain information on the server’s computer.

Prime Computer Services Ltd. is an international educational organization. It is planning to set up its India campus in Mumbai with its head office in Delhi. The Mumbai office campus has four main buildings-ADMIN, ACCOUNTS, EXAMINATION, and RESULT.

You as a network expert have to suggest the best network-related solutions for the problems given below, keeping in mind the distances between the buildings and other given parameters.

Shortest distances between various buildings:

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

1. Suggest the most appropriate location of the server inside the MUMBAI campus (out of the four buildings) to get the best connectivity for the maximum number of computers. Justify your answer.
2. Suggest and draw cable layouts to efficiently connect various buildings within the MUMBAI campus for wired connectivity.
3. Which networking device will you suggest to be procured by the company to interconnect all the computers of various buildings of the MUMBAI campus?
4. The company is planning to get its website designed which will allow students to see their results after registering themselves on its server. Out of the static or dynamic, which type of website will you suggest?
5. Which of the following will you suggest to establish online face-to-face communication between the people in the ADMIN office of the Mumbai campus and the Delhi head office?
   a) Cable TV
   b) Email
   c) Video conferencing
   d) Text chat

'O' in FOSS stands for ______.

Which of the following is not a type of cybercrime?

What is an example of e-waste?