• 1. 
    n which of the following base systems is 123 not a valid number?

  • Base 10
  • Base 16
  • Base8
  • Base 3
  • 2. 
    Storage of 1 KB means the following number of bytes

  • 1000
  • 964
  • 1024
  • 1064
  • 3. 
    What is the octal equivalent of the binary number: 10111101

  • 675
  • 275
  • 572
  • 573.
  • 4. 
    Pick out the CORRECT statement:

  • In a positional number system, each symbol represents the same value irrespective of its position
  • The highest symbol in a position number system as a value equal to the number of symbols in the system
  • It is not always possible to find the exact binary
  • Each hexadecimal digit can be represented as a sequence of three binary symbols.
  • 5. 
    he binary code of (21.125)10 is

  • 10101.001
  • 10100.001
  • 10101.010
  • 10100.111.
  • 6. 
    NAND gate is called a universal logic element because

  • it is used by everybody
  • any logic function can be realized by NAND gates alone
  • all the minization techniques are applicable for optimum NAND gate realization
  • many digital computers use NAND gates.
  • 7. 
    Digital computers are more widely used as compared to analog computers, because they are

  • less expensive
  • always more accurate and faster
  • useful over wider ranges of problem types
  • easier to maintain.
  • 8. 
    Most of the digital computers do not have floating point hardware because

  • floating point hardware is costly
  • it is slower than software
  • it is not possible to perform floating point addition by hardware
  • of no specific reason.
  • 9. 
    The number 1000 would appear just immediately after

  • FFFF (hex)
  • 1111 (binary)
  • 7777 (octal)
  • All of the above.
  • 10. 
    (1(10101)2 is

  • (37)10
  • ( 69)10
  • (41 )10
  • — (5)10
  • 11. 
    The number of Boolean functions that can be generated by n variables is equal to

  • 2n
  • 22 n
  • 2n-1
  • — 2n
  • 12. 
    Consider the representation of six-bit numbers by two’s complement, one’s complement, or by sign and magnitude: In which representation is there overflow from the addition of the integers 011000 and 011000?

  • Two’s complement only
  • Sign and magnitude and one’s complement only
  • Two’s complement and one’s complement only
  • All three representations.
  • 13. 
    A hexadecimal odometer displays F 52 F. The next reading will be

  • F52E
  • G52F
  • F53F
  • F53O.
  • 14. 
    Positive logic in a logic circuit is one in which

  • logic 0 and 1 are represented by 0 and positive voltage respectively
  • logic 0 and, -1 are represented by negative and positive voltages respectively
  • logic 0 voltage level is higher than logic 1 voltage level
  • logic 0 voltage level is lower than logic 1 voltage level.
  • 15. 
    Which of the following gate is a two-level logic gate

  • OR gate
  • NAND gate
  • EXCLUSIVE OR gate
  • NOT gate.
  • 16. 
    Among the logic families, the family which can be used at very high frequency greater than 100 MHz in a 4 bit  ynchronous counter is

  • TTLAS
  • CMOS
  • ECL
  • TTLLS
  • 17. 
    An AND gate will function as OR if

  • all the inputs to the gates are “1”
  • all the inputs are ‘0’
  • either of the inputs is “1”
  • all the inputs and outputs are complemented.
  • 18. 
    An OR gate has 6 inputs. The number of input words in its truth table are

  • 6
  • 32
  • 64
  • 128
  • 19. 
    A debouncing circuit is

  • an astable MV
  • a bistable MV
  • a latch
  • a monostable MV.
  • 20. 
    NAND. gates are preferred over others because these

  • have lower fabrication area
  • can be used to make any gate
  • consume least electronic power
  • provide maximum density in a chip.
  • 21. 
    In case of OR gate, no matter what the number of inputs, a

  • 1 at any input causes the output to be at logic 1
  • 1 at any input causes the output to be at logic 0
  • 0 any input causes the output to be at logic 0
  • 0 at any input causes the output to be at logic 1.
  • 22. 
    The fan put of a 7400 NAND gate is

  • 2TTL
  • 5TTL
  • 8TTL
  • 10TTL
  • 23. 
    Assuming 8 bits for data, 1 bit for parity, I start bit and 2 stop bits, the number of characters that 1200 BPS communication line can transmit is

  • 10 CPS
  • 120 CPS
  • 12CPS
  • None of the above.
  • 24. 
    Indicate which of the following three binary additions are correct? 1.1011 + 1010 = 10101 II. 1010 + 1101 = 10111 III. 1010 + 1101 = 11111

  • I and II
  • II and III
  • III only
  • II and III
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