Uh! I usually mention in my opening post for people like you: "Please don't respond to my post unless you've exact knowledge of what you're talking about" My mistake! I forgot to mention that, so I'll answer your post, which I normally don't do.
Your first question: What did this AF do in last 10 years?
Starting from 2002, PAF successfully, inspite of being in a bad shape back then, mobilized all its assets against India in the famous post Indian Parliament attacks stand-off between the two countries. Combat sorties for several months. Shot down a Israeli made drone over Lahore. Deterred the Enemy through its aggressive tactics.
Second Question: Where was PAF in Kargil conflict?
It was never called in.
Swat and South Waziristan were completely evacuated before the launch of Military Op, unless you believe the TTP is your 'Nation', you wouldn't say that. Do I smell a terrorist sympathizer here? Hunmm?
Third Question: Where was PAF when American Choppers intruded Pakistani airspace on 2nd May 2011?
Well, this shows the level of your immaturity. No country in the world could have defended against a American intrusion like that. Those modified BlackHawks were Stealth, they flew low to avoid the radar waves and this was purely a stealth based Op, which minds like you will never understand.
Fourth Question: Where was PAF during attacks on PA check post at Salala.
Again, immaturity speaks. First of all, if this gets through your thick skull, the borders at the Western front were in the peace-time situation as far as the Air Force Ops were concerned. And, the NATO aircrafts didn't cross much into the Pakistani airspace which could have alarmed the PAF radars. It would have looked like a normal error where some aircrafts have violated a airspace of around 2-3 km range. That's normal in the hot zone. Now, the question is, why didn't PAF react when it received the call of an attack on Pakistani post. It did react, but a bit late, not 'cause of Air Force's mistake, but because of the hypocrisy of NATO officers at the Joint Op station in Kabul. And because there was a delay in communication from the attacked post. This is all military things, that, as you said, a layman will never understand. So I would ask you, Mr. layman, please don't ask questions you don't have exact knowledge of.
And the last point you raised, Zabaniya answered that well.
...the topic is about PAF and their readiness against IAF...IAF being their primary threat, it is natural that PAF gets ready for any challenge all the time...so not a big deal, its their duty and responsibility towards every citizen of Pakistan!
