Computer Science Multiple Choice Questions

What is the main function of all switching time in an operating system?

• Measure the performance of user programs and re-calculate them

• Detect system crashes and re-start the system if necessary

• Schedule tasks on account of predetermined real-time intervals

• Manage memory allocation

What is the time taken to move the arm to the proper cylinder is called?

• Seek time

• Practice delay

• Rotational delay

• Transfer time

Which of the following is NOT a responsibility of Device-Independent I/O Software layer?

• C. Providing a device-independent block size

• D. Assigning error numbers to I/O devices

• A. Uniform interfacing for device drivers

• E. Error handling

• B. Allocating and releasing dedicated devices

Which I/O mode is most suitable for transferring data between memory and I/O devices without the CPU being bothered?

• Direct Memory Access

• Programmed I/O

• Interrupt-driven I/O

• Polling

Blu-ray discs are examples of which type of I/O device?

• Block device

• Disk device

• Hard device

• Character device

In DMA transfer cycles, what is the form of operation called when the DMA controller tells the device to separate the data transfer into a block of N bytes, and then repeats the form?

• Fly-by mode

• Word-at-a-time mode

• Burst mode

• Caching mode

What are the two types of I/O devices roughly?

• Block devices and sequence devices

• Block devices and character devices

• Character devices and circuit devices

• Character devices and digital devices

In memory mapped I/O, to prevent the situation where the software writes an infinite loop while waiting for a device to respond, the following features or mechanisms can be put in place:

• Selectively disable caching

• Selectively disable buffer

• Selectively skip buffer

• Selectively disable caching

In Windows 98, what is the maximum partition size, if the FAT type is FAT 16 and the block size is 4 KB?

• 128MB

• 256MB

• 512MB

• 16GB/4GB

Which file access method is often used to optimize access to large files in a file system?

• Sequential access

• Direct access

• Indexed access

• Linked access