You could argue that the setter is being deliberately obscure here, by asking about Mount Tambora rather than the much better–known eruption of Krakatoa in 1883. But Tambora was the bigger explosion; it measured 7 on the Volcanic Explosivity Index (VEI), as opposed to Krakatoa's 6. The scale is logarithmic, meaning that VEI 7 is potentially ten times as powerful as VEI 6 (although these are obviously not exact measures, so the actual comparison is imprecise).
According to Wikipedia, global temperatures cooled by 0.53 °C (0.95 °F) in the Northern summer of 1816. By contrast, "In the year following the 1883 Krakatoa eruption, average Northern Hemisphere summer temperatures fell by as much as 1.2 °C (2.2 °F). Weather patterns continued to be chaotic for years, and temperatures did not return to normal until 1888."
This would seem to suggest that Krakatoa did in fact have a greater effect on the global climate.
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