21. A flip-flop can store:

A. 1 bits of data
B. 2 bits of data
C. 3 bits of data
D. 4 bits of data
E. None of the above

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22. A logic circuit which is used to change a BCD number into an equivalent decimal number is

A. decoder
B. encoder
C. multiplexer
D. code converter
E. None of the above

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23. Cyclic codes are used in

A. data transfer
B. continuously varying signal representation
C. arithmetic and logical computation
D. All of the above
E. None of the above

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24. The digits used in a binary number system are _____ and _____

A. 9 and 0
B. 0 and 1
C. 1 and 2
D. 3 and 4
E. None of the above

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25. The 2-input XOR gate has a high output only when the input bits are _____

A. even
B. different
C. low
D. high
E. None of the above

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