MCQs

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Overall MCQs for Reference

Which logical value does a true logical expression return in most programming languages?
a. 0
b. 1
c. -1
d. Null
Answer: b. 1sanfoundry
In Python, which symbol is used for the logical AND operator?
a. &
b. |
c. and
d. not
Answer: c. andgeeksforgeeks
Which function in MATLAB returns 1 only if all elements in a vector are non-zero?
a. any()
b. sum()
c. all()
d. mean()
Answer: c. all()sanfoundry
Which of the following represents the logical OR operator in most programming languages?
a. &&
b. ||
c. ^^
d. &|
Answer: b. || sanfoundry
A logical expression evaluates to which two possible values?
a. 0 or 1
b. True or False
c. Both a and b
d. None of the above
Answer: c. Both a and bpythonnumericalmethods.studentorg.berkeley
What is the output of the expression not (2 > 3) in Python?
a. Error
b. True
c. False
d. None
Answer: b. Truegeeksforgeeks
The logical NOT operator in Python is represented by:
a. !
b. not
c. ~
d. ^
Answer: b. notgeeksforgeeks
What does the expression (a < b) return if a=5 and b=10?
a. True
b. False
c. Error
d. None
Answer: a. Truepythonnumericalmethods.studentorg.berkeley
In R, what values can a logical vector contain?
a. TRUE, FALSE, NA
b. 0, 1, Null
c. Yes, No, Maybe
d. Only True or False
Answer: a. TRUE, FALSE, NAr4ds.hadley
The logical AND operator (&&) returns true only if:
a. Both operands are true
b. Both operands are false
c. At least one operand is true
d. None of the above
Answer: a. Both operands are truesanfoundry+1
Which logical operator has the highest precedence?
a. OR
b. AND
c. NOT
d. XOR
Answer: c. NOTteachoo
Which of these is not a logical operator in SQL?
a. OR
b. ALL
c. LIKE
d. +
Answer: d. +includehelp
In most programming languages, which operator is used for logical equality?
a. ==
b. =
c. !=
d. <>
Answer: a. ==pythonnumericalmethods.studentorg.berkeley
The function any() in MATLAB returns 1 if:
a. All elements are zero
b. At least one element is non-zero
c. All elements are negative
d. None of the above
Answer: b. At least one element is non-zerosanfoundry
Select the correct order of precedence for logical operators:
a. AND →NOT→OR
b. OR →AND →NOT
c. NOT→AND→OR
d. AND→OR→NOT
Answer: c. NOT→AND→ORteachoo
Which logical operator is designated as ‘exclusive or’ (XOR)?
a. ^ or xor()
b. &&
c. !
d. |
Answer: a. ^ or xor()press.rebus
In logical expressions, what does the statement (P or Q) mean?
a. At least one is true
b. Both must be true
c. Both must be false
d. None of the above
Answer: a. At least one is truepythonnumericalmethods.studentorg.berkeley
The logical operator for negation is:
a. !
b. not
c. both a and b
d. None of the above
Answer: c. both a and bgeeksforgeeks
In SQL, which of the following is a logical operator?
a. ANY
b. IN
c. ALL
d. All of the above
Answer: d. All of the aboveincludehelp
If A=True, B=False, what is the result of (A and not B)?
a. True
b. False
c. Error
d. None
Answer: a. Truepythonnumericalmethods.studentorg.berkeley+1
Which operator is used for comparison of values in Python?
a. Relational operators
b. Logical operators
c. Assignment operators
d. Arithmetic operators
Answer: a. Relational operatorsscribd
In Python, which expression represents “greater than or equal to”?
a. >=
b. =>
c. =<
d. !>
Answer: a. >=pythonnumericalmethods.studentorg.berkeley
Which operator is used for element-wise logical AND in Python NumPy arrays?
a. &
b. &&
c. and
d. ||
Answer: a. &geeksforgeeks
What would result from the expression (4 > 5 or 5 > 4)?
a. True
b. False
c. Error
d. 0
Answer: a. Truepress.rebus+1
Which logical operator is used to negate a Boolean value in MATLAB?
a. ~
b. !
c. not
d. &
Answer: a. ~sanfoundry
An expression that returns a logical value depending on conditions is called:
a. Logical expression
b. Arithmetic expression
c. Assignment statement
d. None of the above
Answer: a. Logical expressionpythonnumericalmethods.studentorg.berkeley
Which of the following statements about logical vectors in R is true?
a. They can only be TRUE or FALSE
b. They can be TRUE, FALSE, or NA
c. They are always numeric
d. None of the above
Answer: b. They can be TRUE, FALSE, or NAr4ds.hadley
The Python expression (5 == 5 and 3 < 7) returns:
a. True
b. False
c. None
d. Error
Answer: a. Truegeeksforgeeks
Which logical function in R checks if all elements of a logical vector are true?
a. all()
b. sum()
c. length()
d. any()
Answer: a. all()r4ds.hadley
The logical OR operator in R is:
a. |
b. &
c. &&
d. ||
Answer: a. | r4ds.hadley
In SQL, which operator is not logical?
a. OR
b. NOT
c. LIKE
d. EQUAL
Answer: d. EQUALincludehelp
If x=0, y=1, what does the logical expression (x or y) return?
a. True
b. False
c. Zero
d. None
Answer: a. Truepythonnumericalmethods.studentorg.berkeley
What is the result of the Python expression (not True or False)?
a. True
b. False
c. Error
d. None
Answer: b. Falsegeeksforgeeks
In logical expressions, the “not” operator can be applied to:
a. Boolean value
b. Numeric value
c. Arrays/vectors
d. All of the above
Answer: d. All of the abovegeeksforgeeks
Which of the following is not a valid logical operator?
a. and
b. or
c. nor
d. not
Answer: c. norgeeksforgeeks
What is the evaluation result of (3 > 2) and (2 < 1) in Python?
a. True
b. False
c. Error
d. None
Answer: b. Falsegeeksforgeeks
Which is a proper logical expression in data science?
a. temperature > 35
b. height == 180
c. score != 0
d. All of the above
Answer: d. All of the abovepythonnumericalmethods.studentorg.berkeley
In SQL, the condition WHERE age BETWEEN 18 AND 25 is a(n):
a. Logical expression
b. Aggregate function
c. Assignment
d. None of the above
Answer: a. Logical expressionincludehelp
Which is the output of (True and False) or (not False) in Python?
a. True
b. False
c. None
d. Error
Answer: a. Truegeeksforgeeks
Which operator in Python performs logical OR for the entire array?
a. or
b. |
c. &
d. not
Answer: b. | geeksforgeeks
What does the logical operator != mean in most languages?
a. Assignment
b. Greater than or equal to
c. Not equal to
d. Less than
Answer: c. Not equal topythonnumericalmethods.studentorg.berkeley
The output of (not (5 < 10)) in Python is:
a. True
b. False
c. Error
d. None
Answer: b. Falsegeeksforgeeks
In data analysis, logical expressions are often used for:
a. Data filtering
b. Arithmetic calculations
c. Data plotting only
d. None of the above
Answer: a. Data filteringr4ds.hadley
In R, the logical constant NA stands for:
a. Not Authorized
b. New Assignment
c. Not Available
d. Null Argument
Answer: c. Not Availabler4ds.hadley
What is the default result of logical operations in most languages if the condition is false?
a. 1
b. 0
c. -1
d. Null
Answer: b. 0sanfoundry
Which operator would you use in SQL for combining multiple conditions?
a. AND
b. OR
c. NOT
d. All of the above
Answer: d. All of the aboveincludehelp
Which is FALSE about the all() and any() functions?
a. Both return 1 if all elements are non-zero
b. any() returns 1 if at least one element is non-zero
c. all() returns 1 if all elements are non-zero
d. They serve different purposes
Answer: a. Both return 1 if all elements are non-zerosanfoundry
How many Boolean algebra values does a logical vector in R have?
a. 1
b. 2
c. 3
d. 4
Answer: c. 3r4ds.hadley
Which of the following is a valid logical operation in data science?
a. <, >, <=, >=, ==, !=
b. +, -, *, /
c. mean(), median()
d. None of the above
Answer: a. <, >, <=, >=, ==, !=pythonnumericalmethods.studentorg.berkeley
In logical expressions, the result is always:
a. Numeric
b. String
c. Boolean
d. Character
Answer: c. Booleanr4ds.hadley+1

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