Interview question based on skill :
Take as many assements as you can to improve your validate your skill rating
Total Questions: 20
1. What is the output of the following function? nchar()
Correct Answer is : no. of characters
2. What is the output of the following function? Sys.Date()
Correct Answer is : Present date
3. What is the output of the following function? Sys.time()
Correct Answer is : Present date and time
4. Point out the correct statement :
Correct Answer is : The if/else statement conditionally evaluates two statements
5. Which of the following syntax is correct for while loop ?
Correct Answer is : while ( statement1 ) statement2
6. Point out the wrong statement :
Correct Answer is : break will execute a loop while a condition is true
7. _______ is used to break the execution of a loop.
Correct Answer is : break
8. Which of the following statement can be used to explicitly control looping ?
Correct Answer is : break
9. Which of the following should be preferred for evaluation from list of alternatives ?
Correct Answer is : eval
10. Point out the correct statement :
Correct Answer is : All of the mentioned
11. _________ initiates an infinite loop right from the start.
Correct Answer is : repeat
12. Point out the wrong statement :
Correct Answer is : Statements cannot be grouped together using braces ‘{’ and ‘}’
13. _______ is used to skip an iteration of a loop.
Correct Answer is : next
14. R has ________ statements that provide explicit looping.
Correct Answer is : 3
15. The syntax of the repeat loop is :
Correct Answer is : repeat statement
16. Which will be the output of following code ? > x <- 3 > switch(x, 2+2, mean(1:10), rnorm(5))
Correct Answer is : 2.2903605 2.3271663 -0.7060073 1.3622045 -0.2892720
17. What will be the output of the following code ? > x <- 3 > switch(2, 2+2, mean(1:10), rnorm(5))
Correct Answer is : 5.5
18. Point out the correct statement :
Correct Answer is : All of the mentioned
19. Which will be the output of following code ? > x <- 3 > switch(6, 2+2, mean(1:10), rnorm(5))
Correct Answer is :
20. What will be the output of the following code ? > y <- "fruit" > switch(y, fruit = "banana", vegetable = "broccoli", "Neither")
Correct Answer is : “banana”
