Explore topic-wise MCQs in Computer Organization.

This section includes 8 Mcqs, each offering curated multiple-choice questions to sharpen your Computer Organization knowledge and support exam preparation. Choose a topic below to get started.

1.

Consider the following assembly program fragment:stcmov al, 11010110bmov cl, 2rcl al, 3rol al, 4shr al, clmul clThe contents of the destination register ax (in hexadecimal) and the status of Carry Flag (CF) after the execution of above instructions, are:

A. ax = 003CH; CF = 0
B. ax = 001EH; CF = 0
C. ax = 007BH; CF = 1
D. ax = 00B7H; CF = 1
Answer» B. ax = 001EH; CF = 0
Discussion
2.

Arrange the following types of machine in descending order of complexity.(A) SISD(B) MIMD(C) SIMDChoose the correct answer from the options given below:

A. A, B, C
B. C, B, A
C. B, C, A
D. C, A, B
Answer» D. C, A, B
Discussion
3.

Direction: The following item consists of two statements, one labelled as ‘Statement (I)’ and the other as ‘Statement (II)’. Examine these two statements carefully and select the answers to these items using the code given below:Statement (I): READY is an output signal used to synchronize slower peripheral.Statement (II): HOLD is activated by an external signal

A. Both Statement I and Statement II are individually true and Statement II is the correct explanation of Statement I
B. Both Statement I and Statement II are individually true but Statement II is not the correct explanation of Statement I
C. Statement I is true but Statement II is false
D. Statement I is false but Statement II is true
Answer» E.
Discussion
4.

A micro-instruction format has micro-ops field which is divided into three subfields F1, F2, F3 each having seven distinct micro-operations, condition field CD for four status bits, branch field BR having four options used in conjunction with address field ADF. The address space is of 128 memory locations. The size of micro-instruction is :

A. 17 bits
B. 20 bits
C. 24 bits
D. 32 bits
Answer» C. 24 bits
Discussion
5.

If the CALL instruction of 8085 in the main program is conditional then RETURN instruction in the subroutine can be:

A. Conditional
B. Conditional or unconditional
C. Can be determined by LDA instruction
D. Unconditional
Answer» C. Can be determined by LDA instruction
Discussion
6.

Consider the following program fragment in assembly language:mov ax, 0hmov cx, 0A hdoloop:dec axloop doloopWhat is the value of ax and cx registers after the completion of the doloop?

A. ax = FFF5 h and cx = 0 h
B. ax = FFF6 h and cx = 0 h
C. ax = FFF7 h and cx = 0A h
D. ax = FFF5 h and cx = 0A h
Answer» C. ax = FFF7 h and cx = 0A h
Discussion
7.

In X = (M + N × O) / (P × Q), how many one-address instructions are required to evaluate it?

A. 4
B. 6
C. 8
D. 10
Answer» D. 10
Discussion
8.

In the following 8085 program how many times (decimal) is the DCRC executed?LOOP : MVIC, 78 HDCRCJNZLOOPHLT

A. 119
B. 120
C. 78
D. 77
Answer» C. 78
Discussion