Q1 . According to boolean law: A + 1 = ____? *

1

A

0

A'

2. A(A + B) = _______ ? *

AB

1

(1+AB)

A

3. A universal logic gate is one which can be used to generateany logic function. Which of the following is auniversal logicgate? *

OR

AND

XOR

NOR

4. Simplify Y = AB’ + (A’ + B)C_________ *

AB’ + C

A’B + AC’

AB + AC

AB + A

5. How many AND gates are required to realize Y = CD + EF +G? *

4

3

2

1

6. Half-­adders have a major limitation in that they cannot__________ *

Accept a carry bit from a present stage

Accept a carry bit from a next stage

Accept a carry bit from a previous stage

Accept a carry bit from the following stages

7. How many AND, OR and EXOR gates are required for theconfiguration of full adder ? *

1, 2, 2

2, 1, 2

3, 1, 2

4, 0, 1

8. A full adder logic circuit will have __________ *

Two inputs and one output

Three inputs and two outputs

Two inputs and two outputs

Three inputs and one output

9. Don’t care conditions can be used for simplifying Booleanexpressions in ___________ *

Shift register

Adder

K-Map

Latches

10. There are ______ cells in a 4-­variable K-­map. *

16

12

18

8

11. A digital multiplexer is a combinational circuit thatselects ___________? *

One digital information from several sources and transmits theselected one

Many digital information and convert them into one

Many decimal inputs and transmits the selected information

Many decimal outputs and accepts the selected informationOption4

12. What is the function of an enable input on a multiplexerchip? *

To apply Vcc

To connect ground

To active one half of the chip

To active the entire chip

13. How many select lines would be required for an8-­line-­to-­1-­line multiplexer? *

2

4

8

3

14. The word demultiplex means ___________ *

One into many as well as Distributor

Distributor

Many into one

One into one

15. In 1-­to-­4 demultiplexer, how many select lines arerequired? *

4

3

2

1

16. In a demultiplexer the output depends on its____________________ *

Enable pins

Select output

Select inputs

Data output

17. How many inputs will a decimal-­to-­BCD encoderhave? *?

9

10

11

12

18. If we record any music in any recorder, such types ofprocess is called ___________ *

Decoding

Encoding

Demultiplexing

Option 4

19. The purpose of a Digital Comparator is _______________________ *?

To create different outputs

To add a set of different numbers

To compare a set of variables or unknown numbers

To convert analog input into digital

20. How many inputs are required for a digitalcomparator? *

2

3

4

5

subject is DIGITAL ELECTRONICS .

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