Exam (elaborations)
-COMP 110 FINAL EXAM- WITH THE CORRECT ANSWERS.
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-COMP 110 FINAL EXAM- WITH THE CORRECT ANSWERS.
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=~COMP 110 FINAL EXAM~ WITH THE
CORRECT ANSWERS
str literals in Python can be surrounded in either single-quote characters ('like this')
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or double-quote characters ("like this"), though in COMP110 we prefer the double-
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quotes. (T/F) - correct answer- True
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TRUE and FALSE are valid bool values in Python. (T/F) - correct answer- False
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An int literal can begin with a zero, but cannot end with a zero. (T/F) - correct
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answer- False
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What function can we use to identify the type classification of any object in Python? -
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correct answer- type( )
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Every if statement must be followed by a paired else branch. (T/F) - correct answer-
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False
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Lines contained in an else branch in Python do not have to be indented. (T/F) -
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correct answer- False
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You can name a variable else in your program without Python confusing your
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variable's name and the else keyword. (T/F) - correct answer- False
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What is the resulting value and data type of the following expression? int("20") -
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correct answer- 20, int
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What is the resulting value and data type of the following expression? str(2023) +
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str(2023) - correct answer- "20232023", str
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What is the resulting value of the following expression? type(9 / len( str(110)) -
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correct answer- <class 'float'> (Or just float is sufficient on a quiz.)
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,What is the resulting value of the following expression? "440" + "20" - correct
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answer- "44020"
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What value of x would cause the following expression to evaluate to True? (3 + x) ==
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(55 % 2 ** 4) - correct answer- 4
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What value does the following expression result in, and what is its type? 2 + **
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(2 * 0) - correct answer- 4.0
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Using subscription syntax and concatenation, write an expression that evaluates to
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"tar" using the following string: "Saturday". - correct answer- Option 1: "Saturday"[2]
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+ "Saturday"[1] + "Saturday"[4] / Option 2: "Saturday"[2] + "Saturday"[6] +
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"Saturday"[4]
n
What data type do expressions with relational operators typically evaluate to? -
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correct answer- bool
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What does the following expression evaluate to? int("10" + "40") > 100 * 2 - correct
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answer- True
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Global variables are limited to the scope of the function they are declared in. (T/F) -
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correct answer- False
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Variables can have the same name but store different values if they are defined in a
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different scope. (T/F) - correct answer- True
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Named constants should be used to store values that may change throughout the
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program. (T/F) - correct answer- False
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When using a for...in loop, on the first line of the loop you must specify the type of
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the variable (variable refers to i in for i in nums). (T/F) - correct answer- False
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In Python dictionaries, each dictionary's value type must match its key type. (T/F) -
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ncorrect answer- False n n
Writing a for...in loop on a dict loops through the keys of a dictionary. (T/F) - correct
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answer- True
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The values in a dictionary cannot be changed once they are assigned. (T/F) -
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correct answer- False
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Explain the similarities and differences between Python's list and dict. - correct
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answer- Similarities:
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Both are collections that can be looped through using a for...in loop, reference types
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that live on the heap, mutable, can duplicate values, subscription notation to access
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values, .pop()to remove items
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Differences: n
, - list - Index by increasing integers, add items with .append(), ordered, for...in loop
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ngives items n
- dict - Matched Key-Value pairs, pair with assignment operator = (dict_name[key] =
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nvalue), control over key type (not limited to int), for...in gives keys
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A class definition provides a pattern for creating objects, but doesn't make any
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objects itself. (T/F) - correct answer- True
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By convention, Python class names start with a lowercase letter. (T/F) - correct
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answer- False
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When you define a method in a class, all objects of that class have that method
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associated with it. (T/F) - correct answer- True
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The first parameter of a method is a copy of the object the method is called on. (T/F)
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- correct answer- False
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A class definition must come before an object of that class is instantiated. (T/F) -
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correct answer- True
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You must have an instance of a class (an object) to call the class's constructor. (T/F)
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- correct answer- False
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Constructors must have the self parameter in their signature. (T/F) - correct answer-
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True
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Constructors must take at least one parameter other than the self parameter. (T/F) -
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correct answer- False
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Objects are passed into functions by reference. (T/F) - correct answer- True
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The type of an object is the same as the name of the class it is an instance of. (T/F) -
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correct answer- True
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What is computational thinking? - correct answer- Strategic thought and problem-
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solving; Can help perform a task better, faster, cheaper, etc.
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What is an algorithm? - correct answer- A set of steps to solve a general problem.
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What is pseudocode? - correct answer- Simple and readable version of algorithm
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that resembles code.
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What is a conditional statement? - correct answer- A statement that only performs
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an action under certain conditions.
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What is an assignment operator? - correct answer- Assigns a variable some value.
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What is an "Iteration"? - correct answer- One pass through a while loop; often "i" or
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"idx"
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