Q#1: 2’s complement of any binary number can be calculated by
(A) adding 1’s complement twice
(B) adding 1 to 1’s complement
(C) subtracting 1 from 1’s complement
(D) calculating 1’s complement and inverting Most significant bit
Answer: (B) adding 1 to 1’s complement
Q#2: Sum-of-Weights method is used
(A) to convert from one number system to other
(B) to encode data
(C) to decode data
(D) to convert from serial to parallel data
Answer: (A) to convert from one number system to other
Q#3: The complement of a variable is always
(A) 1
(B) 0
(C) The inverse of the variable
(D) None
Answer: (C) The inverse of the variable
Q#4: The difference of 111 – 001 equals
(A) 100
(B) 111
(C) 001
(D) 110
Answer: (D) 110
Q#5: The Unsigned Binary representation can only represent positive binary numbers
(A) TRUE
(B) FALSE
(C)
(D)
Answer: (A) TRUE
Q#6: Which of the following rules states that if one input of an AND gate is always 1, the output is equal to the other input?
(A) A +1 =1
(B) A +A =A
(C) A.A = A
(D) A.1= A
Answer: (C) A.A = A
Q#7: Which of the number is not a representative of hexadecimal system
(A) 1234
(B) ABCD
(C) 1001
(D) DEFH
Answer: (D) DEFH
Q#8: Which one of the following is NOT a valid rule of Boolean algebra?
(A) A = A’
(B) AA = A
(C) A + 1 = 1
(D) A + 0 = A
Answer: (A) A = A’
Q#9: In the binary number ‘10011’ the weight of the most significant digit is
(A) 2^4
(B) 2^3
(C) 2^0
(D) 2^1
Answer: (A) 2^4
Q#10: The binary value ‘1010110’ is equivalent to decimal
(A) 86
(B) 87
(C) 88
(D) 89
Answer: (A) 86
Q#11: 2’s complement of hexadecimal number B70A is
(A) B70B
(B) B709
(C) 48F6
(D) 48F5
Answer: (C) 48F6
Q#12: 2’s complement of 5 is
(A) 1101
(B) 1011
(C) 0101
(D) 1100
Answer: (C) 0101
Q#13: The 4-bit 2’s complement representation of ‘-7’ is
(A) 111
(B) 1111
(C) 1001
(D) 110
Answer: (C) 1001
Q#14: The values that exceed the specified range cannot be correctly represented and are considered as
(A) Overflow
(B) Carry
(C) Parity
(D) Sign value
Answer: (A) Overflow
Q#15: If we multiply ‘723’ and ’34’ by representing them in floating point notation, the value of mantissa of result will be
(A) 24.582
(B) 2.4582
(C) 24582
(D) 0.24582
Answer: (A) 24.582
Q#16: The output of the expression F = A + B + C will be Logic when A=0, B=1, C=1. Here ‘+’ represents OR Gate.
(A) Undefined
(B) One
(C) Zero
(D) 10 (binary)
Answer: (B) One
Q#17: If we add ‘723’ and ‘134’ by representing them in floating point notation, the value of exponent of result will be
(A) 0
(B) 1
(C) 2
(D) 3
Answer: (C) 2
Q#18: In ANSI/IEEE Standard 754, ‘Mantissa’ is represented by
(A) 8-bits
(B) 16-bits
(C) 23-bits
(D) 64-bits
Answer: (C) 23-bits
Q#19: A BCD to 7-Segment decoder has
(A) 3 inputs and 7 outputs
(B) 4 inputs and 7 outputs
(C) 7 inputs and 3 outputs
(D) 7 inputs and 4 outputs
Answer: (B) 4 inputs and 7 outputs
Q#20: The decimal 8 is represented using Gray Code as
(A) 11
(B) 1100
(C) 1000
(D) 1010
Answer: (B) 1100