[Q.71] Which gate is known as the 'Universal Gate' in digital logic?
NAND and NOR gates are universal gates because any Boolean function can be implemented using them.
[Q.72] What is the output of the binary subtraction 11002 - 01012?
12 - 5 = 7, which is 0111 in binary.
[Q.73] Which page replacement algorithm replaces the page that will not be used for the longest period of time in the future?
OPT has theoretical minimum page fault rate by replacing future farthest page.
[Q.74] Which database key uniquely identifies a record in a table and cannot contain NULL values?
Primary key enforces uniqueness and NOT NULL constraints.
[Q.75] In C programming, what does the operator & stand for when placed before a variable name?
&var yields the memory address of var.