Answer
Not uniform circular motion.
The angular acceleration is negative.
Work Step by Step
We can find the angular velocity of two times or more to see if it gives the same magnitude or not.
$$\omega_1=\dfrac{\theta}{t}=\dfrac{2}{0.1}=\bf 20 \;\rm rad/s$$
$$\omega_2=\dfrac{\theta}{t}=\dfrac{3.2}{0.2}=\bf16 \;\rm rad/s$$
$$\omega_3=\dfrac{\theta}{t}=\dfrac{4.3}{0.3}=\bf 14.3\;\rm rad/s$$
$$\omega_4=\dfrac{\theta}{t}=\dfrac{5.3}{0.4}=\bf 13.25\;\rm rad/s$$
It seems that the motion is not uniform, as we see the angular speed decrease.
This means that the angular acceleration is negative.
