An engine works on an ideal Otto cycle with the absolute temperatures at the beginning and end of compression being 300 K (27 °C) and 600 K (327 °C). The air-standard efficiency of the engine 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?