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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
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
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
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
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