Answer the following statements true (T) or false (F)
1. Application programs perform I/O operations by sending a logical request to an operating
system service. The operating system responds by converting that logical I/O request to the appropriate physical I/O commands and communicating those commands from the
operating system to the hardware through a hardware/software interface.
2. The interface that controls a peripheral device executes standard machine language
instructions.
3. After a device is opened, the operating system knows it exists and knows how to
communicate with it.
4. The files stored on a disk are identified by name in the disk’s directory.
5. The programmer is concerned with logical I/O.
1. True
2. False
3. True
4. True
5. True
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An array is a single variable with room to store a group of items.
Answer the following statement true (T) or false (F)
What is the value of the following arithmetic expression if the variables have these values: p
s x 5 20 6 p + 3 * x – s a) -37 b) 3 c) 28 d) 59
When would you want to copy a query?
What will be an ideal response?
The PLS (physical signaling) is where Manchester encoding is applied to the bit stream.
Answer the following statement true (T) or false (F)