Step 1: Context of the Non Co-operation Movement
- The Non Co-operation Movement was started by Mahatma Gandhi in 1920 against British rule.
- It aimed at boycotting foreign goods, schools, colleges, courts, and other institutions to weaken British authority.
Step 2: Events before suspension
- The Jallianwala Bagh massacre (1919) and the Rowlatt Act (1919) were important causes for launching the movement, not for suspending it.
- The Khilafat Movement was merged with it to unite Hindus and Muslims.
Step 3: Immediate cause of suspension
- On 5th February 1922, at Chauri-Chaura in Uttar Pradesh, a violent incident took place where a mob set fire to a police station, leading to the death of 22 policemen.
- Gandhi, being strictly against violence, immediately called off the movement on 12th February 1922.
Step 4: Conclusion
The first and main cause of suspension of the Non Co-operation Movement was the Chauri-Chaura incident.
The correct answer is option (D).
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.