Q.76  An interface that provides I/O transfer of data directly to and form the memory unit and peripheral is termed as  
   (A) DDA.   (B) Serial interface.
   (C) BR.    (D) DMA.
 
 Ans: D
 
Q.77  The 2s compliment form (Use 6 bit word) of the number 1010 is
 (A) 111100.   (B) 110110.
 (C) 110111.   (D) 1011.
 
 Ans: B
 
Q.78 A register capable of shifting its binary information either to the right or the left is called a
 (A) parallel register.   (B) serial register.
 (C) shift register.      (D) storage register.
 
 Ans: C
 
Q.79 What is the content of Stack Pointer (SP)?
 (A)  Address of the current instruction  
 (B)  Address of the next instruction
 (C) Address of the top element of the stack  
 (D) Size of the stack.
 
 Ans: C
 
Q.80 Which of the following interrupt is non maskable
 (A) INTR.      (B) RST 7.5.
 (C) RST 6.5.   (D) TRAP.
 
 Ans: D
 
Q.81  Which of the following is a main memory
 (A) Secondary memory.   (B) Auxiliary memory.
 (C) Cache memory.       (D) Virtual memory.
 
 Ans: C
 
Q.82 Which of the following are not a machine instructions
 (A)  MOV.   (B) ORG.
 (C) END.    (D) (B) & (C).
 
 Ans: D
 
 Q.83 In Assembly language programming, minimum number of operands required for an instruction is/are
 (A) Zero.   (B) One.
 (C) Two.    (D) Both (B) & (C).
 
 Ans: A
 
Q.84  The maximum addressing capacity of a micro processor which uses 16 bit database & 32 bit address base is  
 (A)  64 K.            (B) 4 GB.
 (C) both (A) & (B).   (D) None of these.
 
 Ans: B
 
Q.85  The memory unit that communicates directly with the CPU is called the
 (A) main memory     (B) Secondary memory
 (C) shared memory   (D) auxiliary memory.
 
 Ans: A
 
Q.86 The average time required to reach a storage location in memory and obtain its contents is called  
 (A) Latency time.      (B) Access time.
 (C) Turnaround time.   (D) Response time.
 
 Ans: B
 
State True or False  
 
Q.87    A byte is a group of 16 bits.
 
  Ans: False  
 
Q.88   A nibble is a group of 16 bits.
 
Ans: False  
 
Q.89    When a word is to be  written in an associative memory, address has got to be given.
 
Ans: False  
 
Q.90  When two equal numbers are subtracted, the result would be ______and not_________.
 
   Ans: +ZERO,   -ZERO.