323. When you switch on your personal computer, the first thing that happens is
A. the Power On self Test (POST)
B. the appearance of DOS prompt on your monitor
C. the loading of the operating system from the disk to the RAM
D. none of these

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324. The personal computer's Basic Input Output System (BIOS) is stored in a set of
A. RAM chips
B. ROM chips
C. registers
D. none of these

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325. CMOS step function that contains record of the system configurtion of your personal computeris not available in one of the following classes of personal computers
A. PC ? XT
B. PC ?AT / 286
C. PC ?AT / 386
D. PC ?AT / 486

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326. One of the following is a 16-bit machine
A. IBM PC
B. IBM PC-XT
C. IBM PC-AT / 386
D. IBM PC-AT /286

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327. In the program below, the number of times the FIRST and SECOND JNZ instructions cause the control to be transfared to LOOP respectively :MV!H, 02H,MV! L, 05H,LOOPDCR L,FIRST JNZ LOOP DLR H SECOND JNZ LOOP
A. 5 and 2
B. 4 and 1
C. 259 and 1
D. 260 and 1

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328. A single instruction to clear the lower four bits of the accumulator in 8025 assembly language is
A. MU OHF
B.ANI FOH
C. XRI FOH
D.ANI OFH

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329. Which of the following statements is true?
A. ROM is a Read / Write memory
B. PC points to the last instruction that was executed
C. Stack works on the principle of LIFO
D. All instruction affect the flags

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