Step 1: Federal vs. Unitary systems
- A federal government is one in which powers are divided between the central and state governments (e.g., India, USA, Belgium).
- A unitary government is one in which all powers are concentrated in the central government (e.g., Sri Lanka).
Step 2: Analyze the options
- India: Federal system with powers divided between Union and States.
- Sri Lanka: Has a unitary government, not federal.
- USA: One of the oldest federal systems in the world.
- Belgium: Federal system with power-sharing between communities and regions.
Step 3: Conclusion
Sri Lanka does not have a federal government.
\[
\boxed{\text{Sri Lanka}}
\]
Find the unknown frequency if 24 is the median of the following frequency distribution:
\[\begin{array}{|c|c|c|c|c|c|} \hline \text{Class-interval} & 0-10 & 10-20 & 20-30 & 30-40 & 40-50 \\ \hline \text{Frequency} & 5 & 25 & 25 & \text{$p$} & 7 \\ \hline \end{array}\]
Two concentric circles are of radii $8\ \text{cm}$ and $5\ \text{cm}$. Find the length of the chord of the larger circle which touches (is tangent to) the smaller circle.