R Programming MCQ Questions And Answers - Loops

This section focuses on "Loops" in R Programming. These Multiple Choice Questions (MCQ) should be practiced to improve the R Programming skills required for various interviews (campus interviews, walk-in interviews, company interviews), placements, entrance exams and other competitive examinations.

1. Which loop executes a sequence of statements multiple times and abbreviates the code that manages the loop variable?

A. for
B. while
C. do-while
D. repeat

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2. Which of the following true about for loop?

A. Repeats a statement or group of statements while a given condition is true. It tests the condition before executing the loop body.
B. it tests the condition at the end of the loop body.
C. Both A and B
D. None of the above

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3. Which statement simulates the behavior of R switch?

A. Next
B. Previous
C. break
D. goto

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4. In which statement terminates the loop statement and transfers execution to the statement immediately following the loop?

A. goto
B. switch
C. break
D. label

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5. Point out the wrong statement?

A. Multi-line expressions with curly braces are just not that easy to sort through when working on the command line
B. lappy() loops over a list, iterating over each element in that list
C. lapply() does not always returns a list
D. You cannot use lapply() to evaluate a function multiple times each with a different argument

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6. The mapply() function is a multivariate apply of sorts which applies a function in parallel over a set of arguments.

A. TRUE
B. FALSE
C. Can be true or false
D. Can not say

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7. Which of the following is valid body of split function?

A. function (x, f)
B. function (x, f, drop = FALSE, …)
C. function (x, drop = FALSE, …)
D. function (drop = FALSE, …)

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8. Which of the following character skip during execution?

v <- LETTERS[1:6]
for ( i in v) {
   
   if (i == ""D"") {
      next
   }
   print(i)
}

A. A
B. B
C. C
D. D

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9. What will be output for the following code?

v <- LETTERS[1]
for ( i in v) {
   print(v)
}

A. A
B. A B
C. A B C
D. A B C D

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10. What will be output for the following code?

v <- LETTERS[""A""]
for ( i in v) {
   print(v)
}

A. A
B. NAN
C. NA
D. Error

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