GATE CSE 1995

Question 1
A single instruction to clear the lower four bits of the accumulator in 8085 assembly language?
A
XRI 0FH
B
ANI F0H
C
XRI F0H
D
ANI 0FH
Computer Organization   
Question 2
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 instructions affect the flags
Computer Organization   Memory Chip Design
Question 3
In a vectored interrupt:
A
The branch address is assigned to a fixed location in memory
B
The interrupting source supplies the branch information to the processor through an interrupt vector
C
The branch address is obtained from a register in the processor
D
None of the above
Computer Organization   Interrupt
Question 4
In the following Pascal program segment, what is the value of X after the execution of the program segment?
X := -10; Y := 20;
If X > Y then if X < 0 then X := abs(X) else X := 2*X;
A
10
B
-20
C
-10
D
None
C Programming   Conditional Statement
Question 5
Merge sort uses:
A
Divide and conquer strategy
B
Backtracking approach
C
Heuristic search
D
Greedy approach
Algorithm   Sorting
Question 6
The principle of locality justifies the use of:
A
Interrupts
B
DMA
C
Polling
D
Cache Memory
Computer Organization   Cache Memory
Question 7
In a paged segmented scheme of memory management, the segment table itself must have a page table because
A
The segment table is often too large to fit in one page
B
Each segment is spread over a number of pages
C
Segment tables point to page tables and not to the physical locations of the segment
D
The processor's description base register points to a page table
Operating System   Memory Management
Question 8
Which of the following page replacement algorithms suffers from Belady's anamoly?
A
Optimal replacement
B
LRU
C
FIFO
D
Both (A) and (C)
Operating System   Memory Management
Question 9
In some programming language, an identifier is permitted to be a letter followed by any number of letters or digits. If L and D denote the sets of letters and digits respectively, which of the following expressions defines an identifier?
A
(L + D)^+
B
(L.D)^*
C
L(L + D)^*
D
L(L.D)^*
Theory of Computation   Regular Expression
Question 10
Consider a grammar with the following productions
S \rightarrow a \alpha b \mid b \alpha c \mid aB
S \rightarrow \alpha S\mid b
S \rightarrow \alpha b b\mid ab
S \alpha \rightarrow bd b\mid b
The above grammar is:
A
Context free
B
Regular
C
Context sensitive
D
LR(k)
Theory of Computation   Context Free Grammar
There are 10 questions to complete.

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