Answer
a). $(1)$ temperature will increase.
b). Pressure will become $4$ times.
Work Step by Step
a). By ideal gas law, we have
$P=\frac{NRT}{V}$
b). $P=\frac{NRT}{V}$
If temperature doubles and volume is halved,
$P^{'}=\frac{NR(2T)}{0.5V}=4P$
So, pressure becomes 4 times.