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This set of Operating System (OS) Multiple Choice Questions & Answers (MCQs) focuses on Operating System Set 21

Q1 | A block device transfers                          
  • bytes one by one
  • block of bytes as a unit
  • with unpredictable response times
  • none of the mentioned
Q2 | What is a dedicated device?
  • opposite to a sharable device
  • same as a sharable device
  • can be used concurrently by several processes
  • none of the mentioned
Q3 | A keyboard is an example of a device that is accessed through a                      interface.
  • block stream
  • set of blocks
  • character stream
  • none of the mentioned
Q4 | In polling                          
  • busy – wait cycles wait for i/o from device
  • interrupt handler receives interrupts
  • interrupt-request line is triggered by i/o device
  • all of the mentioned
Q5 | A non blocking system call
  • halts the execution of the application for an extended time
  • does not halt the execution of the application
  • does not block the interrupts
  • none of the mentioned
Q6 | An asynchronous call                          
  • returns immediately, without waiting for the i/o to complete
  • does not return immediately and waits for the i/o to complete
  • consumes a lot of time
  • is too slow
Q7 | Buffering is done to                          
  • cope with device speed mismatch
  • cope with device transfer size mismatch
  • maintain copy semantics
  • all of the mentioned
Q8 | Caching is                  spooling.
  • same as
  • not the same as
  • all of the mentioned
  • none of the mentioned
Q9 | Caching                          
  • holds a copy of the data
  • is fast memory
  • holds the only copy of the data
  • holds output for a device
Q10 | Spooling                          
  • holds a copy of the data
  • is fast memory
  • holds the only copy of the data
  • holds output for a device
Q11 | The                  keeps state information about the use of I/O components.
  • cpu
  • os
  • kernel
  • shell
Q12 | The kernel data structures include
  • process table
  • open file table
  • close file table
  • all of the mentioned
Q13 | If the number of cycles spent busy – waiting is not excessive, then                          
  • interrupt driven i/o is more efficient than programmed i/o
  • programmed i/o is more efficient than interrupt driven i/o
  • both programmed and interrupt driven i/o are equally efficient
  • none of the mentioned
Q14 | A                  is a full duplex connection between a device driver and a user level process.
  • bus
  • i/o operation
  • stream
  • flow
Q15 | The first linux kernel which supports the SMP hardware?
  • linux 0.1
  • linux 1.0
  • linux 1.2
  • linux 2.0
Q16 | Which one of the following linux file system does not support journaling feature?
  • ext2
  • ext3
  • ext4
  • none of the mentioned
Q17 | Which binary format is supported by linux?
  • a.out
  • elf
  • both a.out and elf
  • none of the mentioned
Q18 | Which one of the following bootloader is not used by linux?
  • grub
  • lilo
  • ntldr
  • none of the mentioned
Q19 | The first process launched by the linux kernel is                        
  • init process
  • zombie process
  • batch process
  • boot process
Q20 | Which desktop environment is not used in any linux distribution?
  • gnome
  • kde
  • unity
  • none of the mentioned
Q21 | Standard set of functions through which interacts with kernel is defined by
  • system libraries
  • kernel code
  • compilers
  • utility programs
Q22 | What is Linux?
  • single user, single tasking
  • single user, multitasking
  • multi user, single tasking
  • multi user, multitasking
Q23 | Which one of the following is not a linux distribution?
  • debian
  • gentoo
  • open suse
  • multics
Q24 | Which one of the following is not shared by threads?
  • program counter
  • stack
  • both program counter and stack
  • none of the mentioned
Q25 | A process can be                        
  • single threaded
  • multithreaded
  • both single threaded and multithreaded
  • none of the mentioned