Interview question based on skill :
Take as many assements as you can to improve your validate your skill rating
Total Questions: 20
1. What would be the output of the following code ? > x <- matrix(1:6, 2, 3) > x[1, 2]
Correct Answer is : $mysqli->select_db(‘databasename’);
2. What would be the output of the following code ? > x <- matrix(1:6, 2, 3) > x[1, ]
Correct Answer is : mysqli_connect_errno()
3. Which of the following code extracts the second column for the following matrix ? > x <- matrix(1:6, 2, 3)
Correct Answer is : errno()
4. What would be the output of the following code ? > x <- matrix(1:6, 2, 3) > x[1, , drop = FALSE]
Correct Answer is : Empty String
5. .What would be the output of the following code ? > x <- list(foo = 1:4, bar = 0.6) > x
Correct Answer is : include ‘filename’;
6. Which of the following extracts first element from the following list ? > x <- list(foo = 1:4, bar = 0.6)
Correct Answer is : query()
7. What would be the output of the following code ? > x <- list(foo = 1:4, bar = 0.6, baz = "hello") > name <- "foo" > x$name
Correct Answer is : free()
8. What would be the output of the following code ? > x <- list(foo = 1:4, bar = 0.6, baz = "hello") > name <- "foo" > x[[name]]
Correct Answer is : fetch_array() and fetch_row()
9. What would be the output of the following code ? > x <- list(a = list(10, 12, 14), b = c(3.14, 2.81)) > x[[c(1, 3)]]
Correct Answer is : affected_rows()
10. What would be the output of the following code ? > x <- list(aardvark = 1:5) > x$a
Correct Answer is : MySQL 4.1
11. Which of the following code extracts 1st element of the 2nd element ? > x <- list(a = list(10, 12, 14), b = c(3.14, 2.81))
Correct Answer is : bind_param()
12. What would be the output of the following code ? > x <- list(aardvark = 1:5) > x[["a", exact = FALSE]]
Correct Answer is : close()
13. .What would be the output of the following code ? > x <- c(1, 2, NA, 4, NA, 5) > bad <- is.na(x) > print(bad)
Correct Answer is : fetch()
14. Which of the following is used for reading in saved workspaces ?
Correct Answer is : rollback()
15. ________ is used for outputting a textual representation of an R object
Correct Answer is : 9
16. Which of the following argument denotes if the file has a header line ?
Correct Answer is : 11
17. Which of the following statement would read file “foo.txt” ?
Correct Answer is : DateTime::format()
18. Which of the following function is identical to read.table ?
Correct Answer is : $date = new DateTime();
19. Which of the following code would read 100 rows ?
Correct Answer is : Sunday, February 24th 2008
20. What is the result of the following code ? > y <- data.frame(a = 1, b = "a") > dput(y)
Correct Answer is : date_default_timezone_set(‘Europe/London’);
