Step 1: Overview of Kodarma
Kodarma, a city located in Jharkhand, is famous for its mica mines. It is one of the largest producers of mica in India.
Step 2: Mica as the Correct Mineral
Mica is a mineral that is found abundantly in the Kodarma region, and it is widely used in the manufacturing of electrical and electronic components due to its insulating properties.
Step 3: Why the other options are incorrect
- (A) Bauxite: Bauxite is mainly produced in the states of Odisha and Gujarat, not Kodarma.
- (B) Coal: Coal is produced in large quantities in regions like Jharkhand's Dhanbad but not primarily in Kodarma.
- (C) Iron-ore: Iron-ore is mainly produced in regions like Odisha and Chhattisgarh, not Kodarma.
Thus, the correct answer is option (D) Mica.
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.