Data Science Mock Test 11 - Online MCQ Exam

What does print(Test.__name__) display (assuming Test is the name of the class)?

1 Mark(s)

Your Answer:

() ()
Exception is thrown Exception is thrown
Test Test
__main__ __main__

Which color scheme is often used for sequential data in data visualizations to represent a progression from low to high values?

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Your Answer:

Rainbow Rainbow
Viridis Viridis
Red-Blue Red-Blue
Random Random

What does the acronym "ROI" stand for in the context of business analytics?

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Your Answer:

Return on Investment Return on Investment
Rate of Online Interaction Rate of Online Interaction
Random Order of Information Random Order of Information
Redundant Operations Inference Redundant Operations Inference

In Python, which library is often used for working with graph data structures and performing graph algorithms?

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Your Answer:

NetworkX NetworkX
Seaborn Seaborn
Pandas Pandas
igraph igraph

What will be the output of the following Python code? class A: def __init__(self): self.__x = 1 class B(A): def display(self): print(self.__x) def main(): obj = B() obj.display() main()

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Your Answer:

1 1
0 0
Error, invalid syntax for object declaration
Error, private class member can't be accessed in a subclass

Which of the following is the most suitable definition for encapsulation?

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Your Answer:

Ability of a class to derive members of another class as a part of its own definition
Means of bundling instance variables and methods in order to restrict access to certain class members
Focuses on variables and passing of variables to functions
Allows for implementation of elegant software that is well designed and easily modified

In Python, what is the purpose of the locals() function?

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Your Answer:

Access local variables Access local variables
Import external modules Import external modules
Define instance methods Define instance methods
Create function aliases Create function aliases

What does os.link() do?

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Your Answer:

create a symbolic link create a symbolic link
create a hard link create a hard link
create a soft link create a soft link
none of the mentioned none of the mentioned

What is the primary goal of "A/B testing" in business analytics?

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Your Answer:

Identifying differences in data Identifying differences in data
Creating randomized experiments Creating randomized experiments
Optimizing marketing campaigns Optimizing marketing campaigns
Calculating data storage costs Calculating data storage costs

Confidence interval is a measure of?

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Your Answer:

Accuracy Accuracy
Precision Precision
Error Error
All of above All of above

Which ethical principle emphasizes the importance of ensuring that data practices are legal and follow relevant regulations?

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Your Answer:

Transparency Transparency
Accountability Accountability
Fairness Fairness
Compliance Compliance

What will be the output of the following Python code? >>> a=(2,3,4) >>> sum(a,3)

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Your Answer:

Too many arguments for sum() method Too many arguments for sum() method
The method sum() doesn't exist for tuples
12 12
9 9

What does built-in function type do in context of classes?

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Your Answer:

Determines the object name of any value Determines the object name of any value
Determines the class name of any value Determines the class name of any value
Determines class description of any value
Determines the file name of any value Determines the file name of any value

In Python, how can you extend a list by adding elements from another iterable?

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Your Answer:

extend() extend()
add() add()
append() append()
concat() concat()

Which programming language is commonly used for natural language processing (NLP) tasks in data science?

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Your Answer:

Python Python
R R
Java Java
C++ C++

What is the primary objective of "customer profiling" in business analytics?

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Your Answer:

Understanding customer demographics Understanding customer demographics
Calculating data storage costs Calculating data storage costs
Predicting future market trends Predicting future market trends
Identifying data outliers Identifying data outliers

What will be the output of the following Python code? d = {0, 1, 2} for x in d: print(d.add(x))

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Your Answer:

0 1 2 0 1 2
0 1 2 0 1 2 0 1 2 ... 0 1 2 0 1 2 0 1 2 ...
None None None None None None
None of the mentioned None of the mentioned

How does the order of applying multiple decorators matter?

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Your Answer:

It doesn't matter It doesn't matter
It depends on the number of decorators It depends on the number of decorators
It affects the order of execution It affects the order of execution
It changes the function's return value It changes the function's return value

What is the process of transforming raw data into a structured format suitable for analysis called?

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Your Answer:

Data Aggregation Data Aggregation
Data Wrangling Data Wrangling
Data Imputation Data Imputation
Data Integration Data Integration

Which of the following package is used for reading excel data?

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Your Answer:

xlsx xlsx
xlsc xlsc
read.sheet read.sheet
all of the mentioned all of the mentioned

What is the data type of the result of 10 / 2 ?

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Your Answer:

int int
float float
double double
numeric numeric

What is the output of the following code: my_tuple = (1, 2, 3) print(my_tuple[1])

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Your Answer:

1 1
2 2
3 3
Error Error

In Python, what is the primary use of the super() function in a subclass constructor?

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Your Answer:

Call a method in the parent class Call a method in the parent class
Initialize superclass Initialize superclass
Access instance methods Access instance methods
Define class variables Define class variables

Binomial distribution has _______ parameter?

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Your Answer:

4 4
3 3
2 2
6 6

Which of the following is a common technique used to preprocess text data, involving the removal of common words?

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Your Answer:

Data Stemming Data Stemming
Data Tokenization Data Tokenization
Data Parsing Data Parsing
Data Stopword Removal Data Stopword Removal

What is the purpose of the execute() method in the sqlite3 module?

1 Mark(s)

Your Answer:

To print messages to the console To print messages to the console
To fetch data from a database To fetch data from a database
To execute SQL queries on a database To execute SQL queries on a database
To create new tables in a database To create new tables in a database

In Python, what does the % operator do when used for string formatting?

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Your Answer:

Substitutes variables Substitutes variables
Raises an error Raises an error
Performs division Performs division
Calculates exponentiation Calculates exponentiation

In a data science capstone project, what is the role of "interpretation" and "business impact analysis"?

1 Mark(s)

Your Answer:

Add complexity to the project Add complexity to the project
Replace data exploration Replace data exploration
Choose the mentor Choose the mentor
Explain the implications of findings Explain the implications of findings

What does the term "data privacy" refer to in the context of data science?

1 Mark(s)

Your Answer:

Protecting data from cyberattacks Protecting data from cyberattacks
Safeguarding personal information Safeguarding personal information
Ensuring data accuracy Ensuring data accuracy
Data analysis techniques Data analysis techniques

To read two characters from a file object infile, we use . . . . . . . .

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Your Answer:

infile.read(2) infile.read(2)
infile.read() infile.read()
infile.readline() infile.readline()
infile.readlines() infile.readlines()

Input order is preserved in sets.

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Your Answer:

True True
False False

What is the purpose of the @wraps decorator in Python's functools module?

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Your Answer:

Preserve original function's metadata Preserve original function's metadata
Create wrappers for functions Create wrappers for functions
Decorate GUI elements Decorate GUI elements
Modify function arguments Modify function arguments

Which of these is not a fundamental features of OOP?

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Your Answer:

Encapsulation Encapsulation
Inheritance Inheritance
Instantiation Instantiation
Polymorphism Polymorphism

Any odd number on being AND-ed with . . . . . . . . always gives 1. Hint: Any even number on being AND-ed with this value always gives 0.

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Your Answer:

10 10
2 2
1 1
0 0

Which step in the Data Science process involves visualizing and interpreting the results of data analysis?

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Your Answer:

Data Collection Data Collection
Data Cleaning Data Cleaning
Data Visualization Data Visualization
Model Building Model Building

If in a binomial distribution n = 1 then E(X) is:____________________?

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Your Answer:

q q
p p
0 0
1 1

What will be the output of the following Python code? class A: def __init__(self,x): self.x = x def count(self,x): self.x = self.x+1 class B(A): def __init__(self, y=0): A.__init__(self, 3) self.y = y def count(self): self.y += 1 def main(): obj = B() obj.count() print(obj.x, obj.y) main()

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Your Answer:

3 0 3 0
3 1 3 1
0 1 0 1
An exception in thrown An exception in thrown

If two events can both occur at the same time then they are referred as:__________________?

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Your Answer:

Dependent events Dependent events
Mutually Exclusive events Mutually Exclusive events
Exclusive events Exclusive events
Independent events Independent events

In EDA, what is the purpose of a Q-Q plot (Quantile-Quantile plot)?

1 Mark(s)

Your Answer:

To visualize the distribution of data To visualize the distribution of data
To compare two different datasets To compare two different datasets
To check for normality in data To check for normality in data
To display time series data To display time series data

In k-fold cross-validation, if you choose a higher value of k (e.g., k = 10), what effect does it have on the model evaluation process?

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Your Answer:

It reduces the risk of overfitting It reduces the risk of overfitting
It reduces the number of folds used in training
It increases the model's complexity It increases the model's complexity
It decreases the training time It decreases the training time

What is the primary concern addressed by CCPA (California Consumer Privacy Act) in data privacy?

1 Mark(s)

Your Answer:

Protecting data from cyberattacks Protecting data from cyberattacks
Safeguarding personal information Safeguarding personal information
Ensuring data accuracy Ensuring data accuracy
Regulating data usage Regulating data usage

How do you create a floating-point number in Python?

1 Mark(s)

Your Answer:

5.0 5.0
5 5
"5.0" "5.0"
float(5) float(5)

What is the term for the process of removing or reducing noise and inconsistencies from data?

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Your Answer:

Data Integration Data Integration
Data Transformation Data Transformation
Data Aggregation Data Aggregation
Data Cleansing Data Cleansing

Arrays in object oriented language can be referred to as data storage:

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Your Answer:

constructs constructs
entities entities
collection collection
types types

What will be the output of the following Python code snippet? d = {"john":40, "peter":45} d["john"]

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Your Answer:

40 40
45 45
"john" "john"
"peter" "peter"

Which of the following function is used for searching text strings by means of regular expression?

1 Mark(s)

Your Answer:

grepd grepd
grepl grepl
gepexpr gepexpr
all of the mentioned all of the mentioned

If any of the value in data set is negative then it is impossible to compute:_____________?

1 Mark(s)

Your Answer:

Arithmetic Mean Arithmetic Mean
Harmonic Mean Harmonic Mean
Geometric Mean Geometric Mean
Mode Mode
Median Median

What is the primary purpose of "data encryption" in data ethics and privacy?

1 Mark(s)

Your Answer:

To increase data accessibility To increase data accessibility
To protect data during transmission To protect data during transmission
To improve data quality To improve data quality
To simplify data analysis To simplify data analysis

How can you access a function my_function from a module my_module in Python?

1 Mark(s)

Your Answer:

By using my_module.my_function() By using my_module.my_function()
By using my_module.function() By using my_module.function()
By using my_function.my_module() By using my_function.my_module()
By using function.my_module() By using function.my_module()

What is the purpose of the popitem() method for dictionaries?

1 Mark(s)

Your Answer:

Removes and returns the last key-value pair in the dictionary
Removes and returns a random key-value pair from the dictionary
Removes and returns the first key-value pair in the dictionary
Removes and returns the specified key-value pair from the dictionary

What is the main purpose of "customer segmentation" in data science for business?

1 Mark(s)

Your Answer:

To group customers by age To group customers by age
To categorize customers by location To categorize customers by location
To personalize marketing strategies To personalize marketing strategies
To eliminate customer data To eliminate customer data

Which of the following block information is odd man out?

1 Mark(s)

Your Answer:

Subsetting Subsetting
Raw data Raw data
Ready for analysis Ready for analysis
None of the mentioned None of the mentioned

Suppose for 40 observations, the variance is 50. If all the observations are increased by 20, the variance of these increased observation will be______________?

1 Mark(s)

Your Answer:

50 50
70 70
50/20 50/20
50-20 = 30 50-20 = 30
50 50

What will be the output of the following Python code? class A: def test(self): print("test of A called") class B(A): def test(self): print("test of B called") super().test() class C(A): def test(self): print("test of C called") super().test() class D(B,C): def test2(self): print("test of D called") obj=D() obj.test()

1 Mark(s)

Your Answer:

test of B called test of C called test of A called
test of C called test of B called test of C called test of B called
test of B called test of C called test of B called test of C called
Error, all the three classes from which D derives has same method test()

If P(A∩B) =1/4 then P(AUB) is ________________?

1 Mark(s)

Your Answer:

1/2 1/2
1/3 1/3
1/12 1/12
3/8 3/8

A distribution is called _____ distribution if it has two modes?

1 Mark(s)

Your Answer:

Uni-modal Uni-modal
Bi-model Bi-model
Tri-modal Tri-modal
None of these None of these

What is the purpose of the find() method for strings?

1 Mark(s)

Your Answer:

Returns the index of the first occurrence of a substring
Replaces a substring with another Replaces a substring with another
Counts occurrences of a substring Counts occurrences of a substring
Converts the string to lowercase Converts the string to lowercase

Point on a plane is data type which is:

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Your Answer:

by default by default
randomly defined randomly defined
user defined user defined
not a data type not a data type

In model evaluation, what is the primary goal of stratified sampling when creating train and test sets?

1 Mark(s)

Your Answer:

To prevent overfitting To prevent overfitting
To ensure equal representation of classes
To reduce the size of the training dataset
To increase the model's complexity To increase the model's complexity

Evaluating Your Answers

Data Science Mock Test 11 : Question 1 of 59