Multiple Choice Questions (MCQs)
_______ is used to identify the cause of interrupt.
If the following function, keep(1, 1000); is called in the TSR program, it means that ________ No. of bytes are reserved in the memory.
The keyboard makes use of interrupt number ________ for its input operations.
There are two types of communication; synchronous and anti synchronous
There are ________ kinds of serial communication.
DSR stands for _________.
What will happen if NTFS volume is accessed in DOS?
______ is used to read a block against its LSN.
NTFS volume can be accessed directly in DOS.
Standard PC operates in two modes in terms of memory which are
The _________ function initializes COM port whose number is passed as a parameter using BIOS services.
________ is used to read time from RTC.
Int ________ is used to control the printer via the BIOS.
________ No. of bytes are used to store the character in the key board buffer.
In FAT32, lower _______ bits are used.
Each partition information chunk is 16 bytes long and the last two bytes at the end of the partition table data part is the partition table signature whose value should be_______indicating that the code part contains valid executable code.
Int 14H __________ can be used to send a byte.
The size of each entry in FCB of FAT12 and FAT16 file systems is:
XON whenever received indicates the start of communication and XOFF whenever received indicates a temporary pause in the communication.
The _________ function uses the COM port number to receive a byte from the COM port using BIOS services.
In case of synchronous communication a timing signal is required to identify the start and end of a bit.
BIOS support _________UARTS as COM ports.
Total number of clusters of FAT12 are ________.
To set the interrupt vector means is to change the double word sized interrupt vector within the IVT.
The baud rate is set in accordance with the divisor value loaded within the UART internal registers base +0 and base +1.
DMA may not support memory to memory transfer
Which of the following register is used, if you want to block access of any Hardware.
_______ is a collection of contagious blocks.
Int 14H __________ can be used to set the line parameter of the UART or COM port.
What will be the value of the word located at 1Fh in DPB when number of free clusters on drive is not known?
If we want to send printing on the printer then we have to perform following steps.
Only _______ ports are important from programming point of view.
The amount of memory above conventional memory (extended memory) can be determined using the service _______.
In _______ each byte is needed to be encapsulated in start and end.
Boot sector is the ________ logical sector of NTFS partition.
The service _________ is called the keyboard hook service.
If NTFS volume is accessed in DOS then what will happen?
______ structure is a tree like structure.
_______ store the base address for LPT1.
The memory addresses of COM ports remain same for all computers.
Size of FS Info block is _______.
In DOS we have limit of _______ blocks per cluster.
______ is Disk interrupt.
File is ________ viewed as an organization of data physically it can be collection of clusters or blocks.
Cluster number can also be referred as block number.
The accumulative time that is required to access the selected block is called ________.
When LSN is equal to zero (0), it means ________.
If we want to produce the shrill voice from the speaker phone then we have to load the _________ divisor value at Port _________.
LSN of FSInfo block is available at _____.
In FAT12, to calculate the address or offset from index, we need to multiply it with ________.
The Function of I/O controller is to provide ________.
Counter register can be used to divide clock signal.
Total No. of bytes that can be stored in Keyboard Buffer is_________.
______ is the first block on disk
The service number is usually placed in the ________ register.
DOS has a built in limit of ________ blocks per cluster.
A cluster is same as block.
File can be _______ viewed as organization of data.
IVT is a table containing ______ byte entries each of which is a far address of an interrupt service routine.
_______ is a device incorporated into the PC to update time even if the computer is off.
DOS has practically limit of _________ blocks per cluster.
To store a cluster in FAT32 ________ is/are needed.
BPB stands for ________.
Control information about files is maintained using ______.
The output on the monitor is controlled by a controller called __________ within the PC.
We can access the contents of File by using the root directory entry and ________.
Int _________ service 0 can be used to set the line parameter of the URT or COM port.
If we know the cluster number, we can access the blocks within the cluster using BIOS services directly.
The ______ service # is not used in any interrupt.
When we mark a file as deleted by placing 0xE5 then the chain of clusters in FAT is also replaced by ________.
______whenever received indicates the start of communication and ______ whenever received indicates a temporary pause in the communication.
In NTFS, FAT and root directory has been replaced by ________.
If printer is __________ then printer sends back the ACK signal to the printer interface.
The __________ function simply enables the self test facility within the modem control register.
DCE is ___________.
The BIOS interrupt ________ can be used to configure RTC.
_______ is used to program various common parameters of transfer for all the channels.
In order to produce the sound from PC internal Speaker we have to load the _________ bit divisor value at the _________ port.
At IRQ7 Interrupt # __________ is used.
If FAT entry is between FFF0H to FFF6H in FAT16 then _________.
DTE is _________.
In keyboard status byte bit no. 2 and 3 are used for ctrl and alt keys respectively. which of the following condition is used to check that Ctrl + Alt keys are pressed. Where: unsigned char far * scr = (unsigned char far *)(0x00400017);
Drive paramrter block is derived from ________.
Software based flow control make use of _________control characters
There are two main types of interrupts, namely
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