Q.31  Logic X-OR operation of (4ACO)_H & (B53F)_H results
_=Base
 (A) AACB  (B) 0000
 (C) FFFF  (D) ABCD
 
 Ans: C
 
Q.32  When CPU is executing a Program that is part of the Operating System, it is said to be in
 (A) Interrupt mode  (B) System mode
 (C) Half mode       (D) Simplex mode
 
 Ans: B  
 
Q.33  An n-bit microprocessor has
 (A) n-bit program counter  (B) n-bit address register
 (C) n-bit ALU              (D) n-bit instruction register
 
 Ans: D
 
Q.34  Cache memory works on the principle of
 (A) Locality of data       (B) Locality of memory
 (C) Locality of reference  (D) Locality of reference & memory
 
 Ans: C    
 
Q.35  The main memory in a Personal Computer (PC) is made of  
  (A)  cache memory.     (B)  static RAM
  (C)  Dynamic Ram       (D)  both (A) and (B).
 
 Ans: D
 
Q.36  In computers, subtraction is carried out generally by  
 (A) 1's complement method  
 (B) 2's complement method
 (C) signed magnitude method
 (D) BCD subtraction method
 
 Ans: B
 
Q.37  PSW is saved in stack when there is a
 (A) interrupt recognised  
 (B) execution of RST instruction
 (C) Execution of CALL instruction
 (D) All of these
 
 Ans: A  
 
Q.38  The multiplicand register & multiplier register of a hardware circuit implementing booth's algorithm have (11101) & (1100).  The result shall be
  _=Base
  (A) (812)_10   (B) (-12)_10
  (C) (12)_10    (D) (-812)_10
 
 Ans: A
 
Q.39  The circuit converting binary data in to decimal is
 (A) Encoder  (B) Multiplexer
 (C) Decoder  (D) Code converter
 
 Ans: D
 
Q.40  A three input NOR gate gives logic high output only when
 (A) one input is high  (B) one input is low
 (C) two input are low  (D) all input are high
 
 Ans: D
 
Q.41 n bits in operation code imply that there are ___________ possible distinct operators
   ^=Raised to
   (A) 2n  (B) 2^n
   (C) n/2  (D) n^2
 
   Ans: B
 
Q.42   _________ register keeps tracks of the instructions stored in program stored in memory.
  (A) AR (Address Register)  (B) XR (Index Register)
  (C) PC (Program Counter)   (D) AC (Accumulator)
 
   Ans: C
 
Q.43   Memory unit accessed by content is called
   (A) Read only memory  (B) Programmable Memory
   (C) Virtual Memory    (D) Associative Memory
 
   Ans: D
 
Q.44   ‘Aging registers’ are
   (A) Counters which indicate how long ago their associated pages have been referenced.
   (B) Registers which keep track of when the program was last accessed.
   (C) Counters to keep track of last accessed instruction.
   (D) Counters to keep track of the latest data structures referred.
   Ans: A
 
Q.45   The instruction ‘ORG O’ is a  
   (A) Machine Instruction.     (B) Pseudo instruction.
   (C) High level instruction.  (D) Memory instruction.
   Ans: B