Handout from Duke University's (yes, Duke) Thompson Writing Program Writing Studio. Has good guidelines for and examples of research questions in the humanities and social sciences.
Past honors theses are made available in the Carolina Digital Repository. You can also search the examples by advisor or honors level (honors or highest honors).
Bringing together practical methods from both history and composition, Writing History, Fourth Edition, provides a wealth of tips and advice to help students research and write essays for history classes. The book covers all aspects of writing about history, including finding and researching topics, interpreting source materials, drawing inferences from sources, and constructing arguments. It concludes with three chapters that discuss writing effective sentences, using precise wording, and revising. Using numerous examples from the works of cultural, political, and social historians, Writing History serves as an ideal text in any history course that asks students to conduct research.