Operating System Multiple choice Questions and Answers-Mass Storage Structure

1.	Which RAID level refers to disk mirroring?
a.	0
b.	1
c.	2
d.	3

Answer: (b).1

2.	The amount of time required to read a block of data from a disk into memory is composed of seek time, rotational latency, and transfer time. Rotational latency refers to
a.	the time its takes for the platter to make a full rotation
b.	the time it takes for the read-write head to move into position over the appropriate track
c.	the time it takes for the platter to rotate the correct sector under the head
d.	none of the above

Answer: (a).the time its takes for the platter to make a full rotation

3.	______ is used in operating system to separate mechanism from policy.
a.	Single level implementation
b.	Two level implementation
c.	Multi level implementation
d.	None of the above

Answer: (b).Two level implementation

Answer: (d).All of the mentioned

5.	The data-in register of I/O port is
a.	Read by host to get input
b.	Read by controller to get input
c.	Written by host to send output
d.	Written by host to start a command

Answer: (a).Read by host to get input

6.	The host sets _____ bit when a command is available for the controller to execute.
a.	write
b.	status
c.	command-ready
d.	control

Answer: (c).command-ready

7.	When hardware is accessed by reading and writing to the specific memory locations, then it is called
a.	port-mapped I/O
b.	controller-mapped I/O
c.	bus-mapped I/O
d.	none of the mentioned

Answer: (d).none of the mentioned

8.	Device drivers are implemented to interface
a.	character devices
b.	block devices
c.	network devices
d.	all of the mentioned

Answer: (d).all of the mentioned

9.	Which hardware triggers some operation after certain programmed count?
a.	programmable interval timer
b.	interrupt timer
c.	programmable timer
d.	none of the mentioned

Answer: (a).programmable interval timer

10.	The device-status table contains
a.	each I/O device type
b.	each I/O device address
c.	each I/O device state
d.	all of the mentioned

Answer: (d).all of the mentioned