Interview question based on skill :
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Total Questions: 20
1. ________ add new variables/columns or transform existing variables
Correct Answer is : Case 4 was executed
2. _________ extract a subset of rows from a data frame based on logical conditions.
Correct Answer is : Time To Live King Size
3. dplyr can be integrated with the ________ package for large fast tables
Correct Answer is : Error
4. _________ is an indication that a fatal problem has occurred and execution of the function stops
Correct Answer is : I am here to spoil this code
5. What would be the value of following expression ? log(-1)
Correct Answer is : Error
6. Warnings are generated by the _________ function
Correct Answer is : 0
7. What will be the output of the following code ? > printmessage <- function(x) { + if(x > 0) + print("x is greater than zero") + else + print("x is less than or equal to zero") + invisible(x) + } > printmessage(1)
Correct Answer is : No Output
8. To get the current date, the _______ function will return a Date object which can be converted to a different class if necessary.
Correct Answer is : Not True
9. Which of the following code represents internal representation of a Date object ?
Correct Answer is : 100
10. What would be the output of the following code ? > x <- as.Date("1970-01-01") > x
Correct Answer is : ERROR
11. What would be the output of the following code ? > printmessage <- function(x) { + if(x > 0) + print("x is greater than zero") + else + print("x is less than or equal to zero") + invisible(x) + } > printmessage(NA)
Correct Answer is : Hello World
12. What would be the value of following expression ? > log(-2.3)
Correct Answer is : This WorksThis Too Seems To Work
13. What will be the output of the following code ? > printmessage <- function(x) { + if(x > 0) + print("x is greater than zero") + else + print("x is less than or equal to zero") + invisible(x) + } > printmessage(1)
Correct Answer is : 5
14. What will be the value of following expression ?
Correct Answer is : $num
15. What would be the output of the following code ? > printmessage2 <- function(x) { + if(is.na(x)) + print("x is a missing value!") + else if(x > 0) + print("x is greater than zero") + else + print("x is less than or equal to zero") + invisible(x) + } > printmessage2(NA)
Correct Answer is : Returned value from the function : 30
16. What would be the output of the following code ? > printmessage <- function(x) { + if(x > 0) + print("x is greater than zero") + else + print("x is less than or equal to zero") + invisible(x) + } > printmessage(NA)
Correct Answer is : Have a good night!
17. __________ prints out the function call stack after an error occurs.
Correct Answer is : @yahoo.com
18. Which of the following is primary tool for debugging?
Correct Answer is : $_GET & $_SET
19. ________ allows you to insert debugging code into a function a specific places
Correct Answer is : cross-site scripting
20. _______ allows you to modify the error behavior so that you can browse the function call stack
Correct Answer is : everyone
