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# Combinational Circuits – 1 – 1

1. An output of combinational circuit depends on :

(a) Present inputs
(b) Previous inputs
(c) Both present and previous
(d) None of above

Explanation
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2. Half adder is an example of :

(a) Combinational Circuits
(b) Sequential Circuits
(c) Asynchronous Circuits
(d) None of these

Explanation
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3. The relation between the number of inputs (n) and output (O) of binary code decoder is :

(a) O = 2n
(b) O =  2n
(c) O = n+2
(d) O = n/2

Explanation
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4. How many inputs are required for a 1 to 10 BCD decoder ?

(a) 1
(b) 4
(c) 8
(d) 10

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

(a) encoder
(b) decoder
(c) multiplexer
(d) code converter