CBSE Class 12
Computer Science
07 Understanding Data
30
Total
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Attempted
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00:00:00
Q-1
Consider the dataset: [10, 20, 30, 40, 50]. What is the mean value?
Easy
Statistical Techniques for Data Processing
Answer: 30
Explanation: Mean = (10+20+30+40+50)/5 = 30.
Q-2
Which of the following best describes data processing?
Easy
Data Processing
Answer: Converting raw data into meaningful information
Explanation: Data processing transforms raw data into useful information.
Q-3
What will be the output of the following code?
Easy
Statistical Techniques for Data Processing
Reference Code
import statistics
data=[5,10,15]
print(statistics.mean(data))Answer: 10.0
Explanation: Mean is 10, returned as float 10.0.
Q-4
Which stage involves gathering raw facts from various sources?
Easy
Data Collection
Answer: Collection
Explanation: Data collection is the process of gathering raw data.
Q-5
Which of the following is an example of structured data?
Medium
Data Storage
Answer: Database table
Explanation: Structured data is organized in rows and columns.
Q-6
What will be the median of the dataset [3, 7, 9, 11, 15]?
Medium
Statistical Techniques for Data Processing
Answer: 9
Explanation: Median is the middle value in sorted data → 9.
Q-7
What is the output?
Medium
Statistical Techniques for Data Processing
Reference Code
import statistics
print(statistics.median([2,4,6,8]))Answer: 5.0
Explanation: Median of even set is average → (4+6)/2 = 5.0.
Q-8
Which of the following is used for storing large volumes of data?
Easy
Data Storage
Answer: Hard Disk
Explanation: Hard disk stores large data persistently.
Q-9
What is the mode of dataset [2, 3, 3, 5, 7]?
Easy
Statistical Techniques for Data Processing
Answer: 3
Explanation: Mode is the most frequent value → 3.
Q-10
Which method is used to collect data directly from individuals?
Medium
Data Collection
Answer: Database
Explanation: Survey is a primary data collection method.
Q-11
Which Python function calculates mean without using libraries?
Medium
Statistical Techniques for Data Processing
Reference Code
data=[2,4,6]
print(sum(data)/len(data))Answer: 6
Explanation: Mean = (2+4+6)/3 = 4.
Q-12
Which process organizes raw data into meaningful form?
Easy
Data Processing
Answer: Processing
Explanation: Processing converts raw data into useful information.
Q-13
Which of the following is an example of unstructured data?
Medium
Data Storage
Answer: Text document
Explanation: Unstructured data includes text, images, etc.
Q-14
Which statistical measure is sensitive to extreme values?
Medium
Statistical Techniques for Data Processing
Answer: Mean
Explanation: Mean is affected by extreme values.
Q-15
What is the range of [5, 10, 15, 20]?
Medium
Statistical Techniques for Data Processing
Answer: 15
Explanation: Range = max - min = 20 - 5 = 15.
Q-16
Which of the following stores data temporarily?
Easy
Data Storage
Answer: RAM
Explanation: RAM is volatile memory.
Q-17
Which step involves cleaning and transforming data?
Medium
Data Processing
Answer: Processing
Explanation: Processing includes cleaning and transformation.
Q-18
Which statistical measure represents the middle value?
Easy
Statistical Techniques for Data Processing
Answer: Median
Explanation: Median is the middle value.
Q-19
What will be printed?
Medium
Statistical Techniques for Data Processing
Reference Code
data=[1,2,3,4]
print(max(data)-min(data))Answer: 3
Explanation: Range = 4 - 1 = 3.
Q-20
Which step ensures data is stored for future use?
Easy
Data Storage
Answer: Storage
Explanation: Storage preserves data.
Q-21
Which of the following is primary data?
Medium
Data Collection
Answer: Survey responses
Explanation: Primary data is collected directly.
Q-22
Which tool is commonly used to store structured data?
Easy
Data Storage
Answer: Image
Explanation: Databases store structured data.
Q-23
Which measure indicates most frequent value?
Easy
Statistical Techniques for Data Processing
Answer: Mode
Explanation: Mode represents frequency.
Q-24
Which process involves organizing data into charts or graphs?
Medium
Data Processing
Answer: Processing
Explanation: Processing includes visualization.
Q-25
Which device is used for long-term data storage?
Easy
Data Storage
Answer: Hard Disk
Explanation: Hard disk is non-volatile storage.
Q-26
Which process collects data from surveys and experiments?
Easy
Data Collection
Answer: Collection
Explanation: Collection gathers data.
Q-27
Which statistical measure shows spread of data?
Medium
Statistical Techniques for Data Processing
Answer: Range
Explanation: Range indicates spread.
Q-28
Which stage involves interpreting processed data?
Medium
Data Processing
Answer: Analysis
Explanation: Analysis interprets data.
Q-29
Which type of data is organized in rows and columns?
Easy
Data Storage
Answer: Structured data
Explanation: Structured data is tabular.
Q-30
Which process converts raw data into useful information?
Easy
Data Processing
Answer: Processing
Explanation: Processing transforms data into information.