In an experiment with a convex lens, the plot of the image distance (v') against the object distance (u') measured from the focus gives a curve v'u' = 225. If all distances are measured in cm, the magnitude of the focal length of the lens is:

Which of the following territories was annexed by Lord Dalhousie under the pretext of misgovernance, and not directly through the Doctrine of Lapse?

What was the primary stated reason for the Partition of Bengal in 1905 by Lord Curzon?

Which of the following events is considered the immediate trigger for the launch of the Non-Cooperation Movement by Mahatma Gandhi?