The All India Services are the
three all India Civil Services of India, namely the
Indian Administrative Service (IAS), the Indian
Police Service (IPS) & the Indian Forest Service
(IFS). The officers of the All India Services are
recruited and trained by the federal Union
Government ("the Centre") and serve in the
various State Governments ("the States") as well
as Centre (which is why the Indian Revenue
Service is a "central service" instead of an All
India Service as they work only in the Central
Government).
ভাষা ও ভাষার উৎপত্তি
Plasma Physics (প্লাজমা পদার্থবিদ্যা)
Laser (লেজার)
Quantum materials (কোয়ান্টাম উপকরণ)
Particle physics (কণা পদার্থবিজ্ঞান)
Optics (অপটিক্স এবং ফোটোনিক্স)