21. In binary number system a digit ranges from ……….. ?
(a) 0 to 1
(b) 0 to 7
(c) 0 to 9
(d) 0 to 15
22. Storage of 8 KB means the following number of bytes :
(a) 1000
(b) 1024
(c) 8192
(d) 9182
23. The two’s complement system is to be used to add the signed numbers 23230010 and 23230023. Determine, in decimal, the sign and value of each number and their sum.
(a) ‟14 and ‟13; ‟27
(b) ‟233 and ‟234; 227
(c) ‟27 and ‟13; 40
(d) ‟23 and ‟16; ‟27
24. The fast carry or look-ahead carry circuits found in most 4-bit parallel-adder circuits:
(a) increase ripple delay
(b) add a 1 to complemented inputs
(c) reduce propagation delay
(d) determine sign and magnitude
25. What are the two types of basic adder circuits?
(a) half adder and full adder
(b) half adder and parallel adder
(c) asynchronous and synchronous
(d) one’s complement and two’s complement
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