Which logic gate is represented by the following diagram?

Converting the binary number $1011.01$ into decimal gives ....

The given symbol represents:

In which of the logic gate the following statement is true? "The output is high when either of the inputs is high but not if both inputs are high"

$A$ combination of logic gates is as shown in the figure. $P$,$Q$,$R$,and $S$ are the inputs and $X$,$Y$,and $Z$ are outputs. When inputs $P$ and $R$ are 'low' $(0)$ and $Q$ and $S$ are 'high' $(1)$,the outputs $X$,$Y$,and $Z$ are respectively:

$A$ typical integrated circuit $(IC)$ consisting of logic gates $\leq 1000$ is termed as