Intro to Data Science: 100 Practice MCQs with Key (For B.Sc, B.E, IT, AI & ML)

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​ 100 Data Science Basics MCQs with Answers

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✅ Section 1: General Data Science Concepts (1–20)
1. What is the primary goal of data science?
A) Data storage
B) Data cleaning
C) Extracting insights from data
D) Software development
Ans: C




2. Which of the following is NOT a step in the data science process?
A) Data collection
B) Data visualization
C) Web development
D) Data preprocessing
Ans: C




3. Which language is most commonly used in Data Science?
A) Java
B) Python
C) C++
D) HTML
Ans: B




4. What is ‘Big Data’?
A) Data with large fonts
B) Extremely large datasets that can't be handled by traditional tools
C) A software
D) Structured small data
Ans: B




5. What is the full form of EDA?

, A) Electronic Data Analysis
B) Exploratory Data Analysis
C) Elastic Data Algorithm
D) Enhanced Data Application
Ans: B




...
(Questions 6 to 20 include: structured vs unstructured data, supervised learning, importance of
labeling, etc.)




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✅ Section 2: Statistics & Probability (21–40)
21. What does standard deviation measure?
A) Central value
B) Spread of data
C) Skewness
D) Median
Ans: B




22. Mean of [2, 4, 6, 8, 10] is:
A) 6
B) 5
C) 8
D) 10
Ans: B




23. In probability, what does 0.5 mean?
A) Impossible event
B) Certain event
C) Equal chance
D) Error
Ans: C