Step 1: Role of Bismarck in German Unification
The unification of Germany in the 19th century was primarily achieved through the efforts of Otto von Bismarck, the Prime Minister of Prussia. He used diplomatic strategies, alliances, and wars to unite the various independent German states into a single nation-state under Prussian leadership.
Step 2: Why the other options are incorrect
- (A) Hitler: Although Adolf Hitler played a significant role in 20th-century German history, he was not involved in the unification of Germany, which happened long before his rise to power.
- (C) Mussolini: Mussolini was the key figure in the unification of Italy, not Germany.
- (D) Garibaldi: Garibaldi played a major role in the unification of Italy, not Germany.
Thus, the correct answer is option (B) Bismarck.
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.