A gas is compressed adiabatically, which one of the following...

In adiabatic process,

$∆ Q = 0$ and $∆ U \ne 0$

Using the first law of thermodynamics, $∆ Q = ∆ U + W$

$⇒ ∆ U = - W\left(W\text{is the work done by the gas}, \text{so} - W\text{will be the work done on the gas}\right)$

As the gas is compressed

$W < 0$

Therefore, $∆ U > 0$ and hence $∆ T > 0$.