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Digital Logic Circuits Quiz - Computer Organization Objective Questions and Answers

Questions
6 The half adder performs
A Decimal addition operation for 2 decimal inputs
B Binary addition operation for 2 binary inputs
C Decimal addition operation for 2 binary inputs
D Binary addition operation for 2 decimal inputs

Answer: Option [C]

The half adder performs decimal addition operation for two binary inputs

7 Which Logic circuit would you use for addressing memory ?
A Full adder
B Multiplexer
C Decoder
D Direct memory access circuit

Answer: Option [C]
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8 One of the major difference between a combinational logic circuit such as a decoder and a storage circuit such as an RS latch is that
A The storage circuit requires a different class of gates.
B The storage circuit requires a clock input.
C The storage circuit uses feedback
D The storage circuit has no propagation delay

Answer: Option [B]

Flip-Flop is the basic unit of storage circuits. Where Flip-Flops require a clock input.

9 A Flip-Flop circuit can be used for
A Counting
B Scaling
C Rectification
D Demodulation

Answer: Option [A]

Counter is a sequential circuit which counts its state & used to construct finite state machines

10 One bit full adder can be designed using
A Two half adders and one OR gate
B Two half adders
C One Ex-OR and two NAND gates
D Two Ex-OR and four NAND gates

Answer: Option [B]

A 1 bit full adder can be constructed by using 2 half adders

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