Computer Science

Q.1   In Reverse Polish notation, expression A*B+C*D is written as   
 
 (A)  AB*CD*+   (B)  A*BCD*+
 (C) AB*CD+*   (D)  A*B*CD+
 
  Ans: A
 
Q.2    SIMD represents an organization that ______________.   
 (A) refers to a computer system capable of processing several programs at the same time.  
 (B) represents organization of single computer containing a control unit, processor unit and a memory unit.
 (C) includes many processing units under the supervision of a common control unit
 (D) none of the above.
 
  Ans: C
 
Q.3   Floating point representation is used to store
 (A) Boolean values   (B)  whole numbers
 (C)  real integers   (D)  integers
 
 Ans: C
 
Q.4  Suppose that a bus has 16 data lines and requires 4 cycles of 250 nsecs each to transfer data. The bandwidth of this bus would be 2 Megabytes/sec. If the cycle time of the bus was reduced to 125 nsecs and the number of cycles required for transfer stayed the same what would the bandwidth of the bus?  
   (A)  1 Megabyte/sec   (B)  4 Megabytes/sec
   (C)  8 Megabytes/sec    (D)  2 Megabytes/sec
 
 Ans: D
 
Q.5  Assembly language
 
 (A) uses alphabetic codes in place of binary numbers used in machine  language  
 (B)  is the easiest language to write programs
 (C)  need not be translated into machine language
 (D)  None of these
 
 Ans: A  
 
Q.6  In computers, subtraction is generally carried out by  
 (A)  9’s complement   (B)  10’s complement
 (C)  1’s complement   (D)  2’s complement
 
 Ans: D  
 
Q.7  The amount of time required to read a block of data from a disk into memory is composed of seek time, rotational latency, and transfer time. Rotational latency refers
to
 (A) the time its takes for the platter to make a full rotation  
 (B)  the time it takes for the read-write head to move into position over the appropriate track
 (C)  the time it takes for the platter to rotate the correct sector under the head
 (D)  none of the above
 
 Ans: A  
 
Q.8  What characteristic of RAM memory makes it not suitable for permanent storage?
  (A) too slow         (B)  unreliable
  (C) it is volatile   (D)  too bulky
 
 Ans: C  
 
Q.9  Computers use addressing mode techniques for _____________________.
 
 (A) giving programming versatility to the user by providing facilities as pointers to memory counters for loop control  
 (B)  to reduce no. of bits in the field of instruction
 (C)  specifying rules for modifying or interpreting address field of the instruction
 (D)  All the above
 
 Ans: D  
 
 Q.10  The circuit used to store one bit of data is known as
   (A)  Register   (B)  Encoder
   (C)  Decoder    (D)  Flip Flop
    
 Ans: D  
 
Q. 11  (2FAOC)_16 is equivalent to
_ = Base
  (A) (195 084)_10
  (B) (001011111010 0000 1100)_2
  (C) Both (A) and (B)   
  (D) None of these

  Ans: B
 
Q.12  The average time required to reach a storage location in memory and obtain its contents is called the
 (A) seek time  (B) turnaround time
 (C) access time  (D) transfer time
 
 Ans: C
 
Q.13  Which of the following is not a weighted code?
 (A) Decimal Number system  (B) Excess 3-cod
 (C) Binary number System  (D) None of these
 
 Ans: B
 
Q.14  The idea of cache memory is based
 (A) on the property of locality of reference
 (B) on the heuristic 90-10 rule
 (C) on the fact that references generally tend to cluster
 (D) all of the above
 
 Ans: A
 
Q.15  _________ register keeps track 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