Answer: The Non-Cooperation Movement started from Khilafat Conference at Calcutta (Kolkata) in September 1920, and was formally adopted in the Nagpur Session of the Indian National Congress in December 1920.
Key Point: - Calcutta (September 1920): Initial launch at the Khilafat Conference.
- Nagpur (December 1920): Congress formally adopted and expanded the movement to the entire nation.
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.