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Hassan
1.Parallel adders are:
A. combinational logic circuits
B. sequential logic circuits
C. both (a) and (b)
D. combinational logic circuits
2.How many truth tables can be made from one function table ?
A. one
B. two
C. three
D. one
3.A comparison between serial and parallel adder reveals that serial order?
A. is faster
B. is slower
C. operates at the same speed as parallel adder
D. is faster
4.A combinational circuit is one in which the output depends on the:
A. input combination at the time
B. input combination and the previous output
C. input combination at that time and the previous input combination
D. input combination at the time
5.A combinational logic circuit which generates a particular binary word or number is:
A. Demultiplexer
B. Encoder
C. Multiplexer
D. Demultiplexer
6.In which of the following adder circuits, the carry look ripple delay is eliminated ?
A. Half adder
B. Full adder
C. Parallel adder
D. Half adder
7. Adders:
A. adds 2 bits
B. needs two input and generates two outpu
C. is called so because a full adder involves two half-adders
D. adds 2 bits
8.The inverter OR-gate and AND gate are called deeision-making elements because they can recognize some input while disregarding others. A gate recognize a word when its output is:
A. words,high
B. bytes,low
C. bytes,high
D. words,high
9.An AND circuit:
A. is a memory circuit
B. gives an output when all input signals are present simultaneously
C. is a -ve OR gate
D. is a memory circuit
10.Which of the following adders can add three or more numbers at a time ?
A. Parallel adder
B. Carry-look-ahead adder
C. Carry-save-adder
D. Parallel adder
11.Which one of the following logic expression is incorrect?
A. 1 ⊕ 0 = 1
B. 1 ⊕ 1 ⊕ 0 = 1
C. 1 ⊕ 1 ⊕ 1 = 1
D. 1 ⊕ 0 = 1
12. If A ⊕ B = C, then:
A. A ⊕ C = B
B. B ⊕ C = A
C. A ⊕ B ⊕ C = 0
D. A ⊕ C = B
13.A small dot or circle printed on top of an IC indicates:
A. Vcc
B. Gnd
C. Pin 14
D. Vcc
14.The number of two input multiplexers required to construct a 210 input multiplexer is:
A. 31
B. 10
C. 127
D. 31
15.The full adder adds the Kth bits of two numbers to the:
A. difference of the previous bits
B. sum of all previous bits
C. carry from ( K - 1 )TH bit
D. difference of the previous bits
16.The octal number (651.124)8 is equivalent to:
A. (1A9.2A)16
B. (1B0.10)16
C. (1A8.A3)16
D. (1A9.2A)16
17. The octal equivalent of the decimal number (417)10 is:
A. (641)8
B. (619)8
C. (640)8
D. (641)8
18.Convert the hexadecimal number (1E2)16 to decimal:
A. 480
B. 483
C. 482
D. 480
19.(170)10 is equivalent to:
A. (FD)16
B. (DF)16
C. (AA)16
D. (FD)16
20.Convert (214)8 into decimal:
A. (140)10
B. (141)10
C. (142)10
D. (140)10
21.Convert (0.345)10 into an octal number:
A. (0.16050)8
B. (0.26050)8
C. (0.19450)8
D. (0.16050)8
22.Convert the binary number (01011.1011)2 into decimal:
A. (11.6875)10
B. (11.5874)10
C. (10.9876)10
D. (11.6875)10
23.Octal to binary conversion: (24)8 =?
A. (111101)2
B. (010100)2
C. (111100)2
D. (111101)2
24.Convert binary to octal: (110110001010)2 =?
A. (5512)8
B. (6612)8
C. (4532)8
D. (5512)8
25. Which of the following is not a type of number system?
A. Positional
B. Non-Positional
C. Octal
D. Positional
26.How is the number 5 represented in non-positional number system?
A. IIIII
B. 5
C. V
D. IIIII
27. The LSB and MSB of 1243247 are ____ and ____?
A. 1, 7
B. 4, 7
C. 7, 1
D. 1, 7
28.A device that uses positional notation to represent a decimal number:
A. Abacus
B. Calculator
C. Pascaline
D. Abacus
29.The 2’s complement of 5 is ______________?
A. 1011
B. 0101
C. 1010
D. 1011
30.What does BCD stand for?
A. Bitwise coded decimal
B. Binary coded decimal
C. Binary converted decima
D. Bitwise coded decimal
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