Compilers

Symbol Table Organization

Question 1
Marks : +2 | -2
Pass Ratio : 100%
_________ register keeps track of the instructions stored in program stored in memory.
AR (Address Register)
XR (Index Register)
PC (Program Counter)
AC (Accumulator)
Explanation:
Program Counter keeps track of the next instruction.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
If memory access takes 20 ns with cache and 110 ns without it, then the ratio (cache uses a 10 ns memory) is __________
93%
90%
88%
87%
Explanation:
The answer is 90%.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
Logic X-OR operation of (4ACO) H & (B53F) H results __________
AACB
0000
FFFF
ABCD
Explanation:
Xoring the two operands we get FFFF.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
Generally Dynamic RAM is used as main memory in a computer system as it ____________
Consumes less power
Has higher speed
Has lower cell density
Needs refreshing circuitry
Explanation:
Because of higher speed it is Dynamic.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
Cache memory works on the principle of _________
Locality of data .
Locality of memory
Locality of reference
Locality of reference & memory
Explanation:
Cache works on Locality of reference.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
If the main memory is of 8K bytes and the cache memory is of 2K words. It uses associative mapping. Then each word of cache memory shall be __________
11 bits
21 bits
16 bits
20 bits
Explanation:
Each should be 8*2=16 bits.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
Write Through technique is used in which memory for updating the data ___________
Virtual memory
Main memory
Auxiliary memory
Cache memory
Explanation:
The answer is cache memory.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
The addressing mode used in an instruction of the form ADD X Y is ________
Absolute
Indirect
Index
None of the mentioned
Explanation:
This addressing mode is indexed.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
Virtual memory consists of _________
Static RAM
Dynamic RAM
Magnetic memory
None of the mentioned
Explanation:
It does consist of static RAM.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
In a vectored interrupt ____________
The branch address is assigned to a fixed location in memory
The interrupting source supplies the branch information to the processor through an interrupt vector
The branch address is obtained from a register in the processor
None of the mentioned
Explanation:
It branches to process the interrupt.