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1

How many rows in the NAND gate truth table produce output 0?

Hard 3 Marks

NAND is the complement of AND — AND has one row with output 1 so NAND has one row with output 0.

A 0

B 1

C 2

D 3

2

How many rows in a 2-input NOR gate truth table produce output 1?

Hard 3 Marks

NOR is the complement of OR — OR has one row with output 0 so NOR has one row with output 1.

A 0

B 1

C 2

D 3

3

What does the expression Y = (A · B) + C mean?

Hard 3 Marks

Evaluate the brackets first then apply the OR operation.

A Y is true only when A B and C are all true

B Y is true if both A and B are true OR if C is true

C Y is true only when C is true

D Y is always false when A is false

4

What is the key difference between combinational and sequential circuits?

Hard 3 Marks

What do sequential circuits have that combinational circuits do not?

A Combinational circuits are faster than sequential circuits

B Sequential circuits use only AND and OR gates while combinational use NOT

C Combinational circuits have no memory; sequential circuits include memory elements

D Sequential circuits can only count; combinational circuits only add

5

Which of the following best describes why universal gates are widely used in integrated circuits?

Hard 3 Marks

Think about manufacturing advantages of using just one type of gate.

A They consume less electricity than other gates

B They can recreate any other gate reducing the variety of components needed in manufacturing

C They produce faster outputs than AND and OR gates

D They are the only gates that support 3-input operations

Computer Studies