::: vuaskari.com ::: CS401 23rd Paper by Umair Saulat

CS401

My today's Paper 23rd July 2011, Time 07.30 AM North Nazimabad Campus Karachi by

Umair Saulat

Most of the MCQs from the past paper.

Qno.41            How cam we improve the spec of the multitasking ? (2)

Qno.42            What do you mean by data label and code label ?    (2)

Qno.43            What is system descriptor?                                          (2)

Qno.44            What are device driver, Give your answer in two or three lines        (2)

Qno.45            In what order the parameters are passed to routine in Pascal and C Language    (3)

Qno.46            What is multitasking                                                                           (3)

Qno.47            Difference between wraparound and physical wraparound and physical wraparounds

Qno.48            What is extended read service INT 3 service                                                 (3)

Qno.49            How to load AND/ OR execute program using INT 21 services         (5)

Qno.50            Describe the formal of interrupt descriptor                                        (5)

Qno.51            Following piece of code is taken from the program of scrolling up the screen write against each instruction what it does (5)

                        Mov ax 80

                        Mu byte [bp+4]

Mov si, ax

Push si

Shl si1

Qno.52            In context of video service write character and attribute at cursor position using INT 10 pick up correct statement given between and put it is proper blank spaces

                        AH…………………………………………….

                        AL…………………………………………….

                        BH…………………………………………….

                        BL…………………………………………….

                        CX…………………………………………….                                                        (5)

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