Q. What is output of following perl program ? My $val='x'; print ref($val);
✅ Correct Answer: (B)
empty value
Operating System Architecture MCQs | Page - 64
Dear candidates you will find MCQ questions of Operating System Architecture here. Learn these questions and prepare yourself for coming examinations and interviews. You can check the right answer of any question by clicking on any option or by clicking view answer button.
Q. Other boot loaders which can be used to load Linux exist:
✅ Correct Answer: (A)
grub
Q. Choose the correct answers if the command ls -l /dev/mt0 display's brw_rw_ _ _ _ 1 root 3, 0 Apr18 1:05 mt0
✅ Correct Answer: (D)
all of these
Q. Which of the following shell's wildcards are used to match any number of characters including none?
✅ Correct Answer: (D)
*
Q. Which command is used to display all the lines with the string 'sales' from the file empl.lst?
✅ Correct Answer: (C)
grep sales empl.lst
Q. /bin/passwd has the user execution permission set to 's' because
✅ Correct Answer: (D)
all of these
Q. If one doesn't want anyone else to read or write to a file named datfile, except through a program in a file filex , then he may use
✅ Correct Answer: (D)
both (a) and (b)
Q. The differences between malloc( ) and calloc() are:
✅ Correct Answer: (D)
both (b) and ©
Q. The command line argument a.out x 'a b' "c d"
✅ Correct Answer: (A)
is acceptable
Q. Which command is used with vi editor to move cursor forward to first occurrence of character 'ch' in the current line?
✅ Correct Answer: (B)
fch
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