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WorksheetsDLD Unit 1 _ 2
Total questions: 20
Worksheet time: 19mins
1’s complement of 1011101 is ____________
0101110
1001101
0100010
1100101
2’s complement of 11001011 is ________
01010111
11010100
00110101
11100010
On subtracting (01010)2 from (11110)2 using 1’s complement, we get ____________
01001
11010
10101
10100
On subtracting (101011)2 from (111001)2 using 2’s complement, we get ____________
1101100
0011100
11010101
11010111
1’s complement can be easily obtained by using _________
Comparator
Inverter
Adder
Subtractor
The advantage of 2’s complement system is that _________
Only one arithmetic operation is required
Two arithmetic operations are required
No arithmetic operations are required
Different Arithmetic operations are required
Binary coded decimal is a combination of __________
Two binary digits
Three binary digits
Four binary digits
Six binary digits
The decimal number 10 is represented in its BCD form as __________
10100000
01010111
00010000
00101011
Add the two BCD numbers: 1001 + 0100 = ?
10101111
01010000
00010011
00101011
Carry out BCD subtraction for (68) – (61)
00000111
01110000
100000111
011111000
When numbers, letters or words are represented by a special group of symbols, this process is called __________
Decoding
Encoding
Digitizing
Inverting
A three digit decimal number requires ________ for representation in the conventional BCD format.
3 bits
6 bits
12 bits
24 bits
How many bits would be required to encode decimal numbers 0 to 9999 in straight binary codes?
12
14
16
18
The excess-3 code for 597 is given by __________
100011001010
100010100111
010110010111
010110101101
The output of a logic gate is 1 when all the input are at logic 0
A NAND or an EX-OR
An OR or an EX-NOR
An AND or an EX-OR
A NOR or an EX-NOR
The code where all successive numbers differ from their preceding number by single bit is __________
Alphanumeric Code
BCD
Excess 3
Gray
How many AND gates are required to realize Y = CD + EF + G?
4
5
3
2
How many two-input AND and OR gates are required to realize Y = CD+EF+G?
2, 2
2, 3
3, 3
3, 2
How many truth table entries are necessary for a four-input circuit?
4
8
12
16
If we use an AND gate to inhibit(stop) a signal from passing one of the inputs must be ___________
LOW
HIGH
Inverted
Floating
