#41

What is Japan’s highly active volcano on Kyushu, monitored in 2025?

(a) Unzen

(b) Mount Fuji

(c) Aso Volcano

(d) Sakurajima

Explanation: Sakurajima, on Kyushu, Japan, is one of Japan’s most active volcanoes, with 2025 activity reported in X posts. Mount Fuji is iconic but dormant, Aso and Unzen are less active, making Sakurajima the correct choice.

#42

Which Canary Islands volcano had ash studies conducted in 2025?

(a) El Hierro

(b) Teide

(c) Cumbre Vieja

(d) Timanfaya

Explanation: Cumbre Vieja, on La Palma, Canary Islands, Spain, had volcanic ash analyzed in 2025, as reported in web sources. Teide, El Hierro, and Timanfaya are other volcanoes but lack 2025 ash studies, making Cumbre Vieja the correct choice.

#43

Which Icelandic volcano is monitored for potential 2025 eruptions?

(a) Grímsvötn

(b) Katla

(c) Eyjafjallajökull

(d) Hekla

Explanation: Hekla, in Iceland, is a highly active volcano monitored for potential 2025 eruptions, as noted in web sources on Iceland’s volcanic activity. Katla, Eyjafjallajökull, and Grímsvötn are also active but less emphasized in 2025, making Hekla the correct choice.

#44

What is the term for a volcano that has not erupted recently but may do so in the future?

(a) Dormant

(b) Active

(c) Fumarole

(d) Extinct

Explanation: A dormant volcano has not erupted in recent history but retains the potential for future activity, distinguishing it from active or extinct volcanoes.

#45

What is the largest of the Great Lakes, studied in 2025 for ancient basin formation?

(a) Lake Erie

(b) Lake Superior

(c) Lake Michigan

(d) Lake Huron

Explanation: Lake Superior, in the USA and Canada, is the largest Great Lake by area (82,100 km²), with 2025 studies suggesting its basin formed millions of years ago, as per a web source. Huron, Michigan, and Erie are smaller, making Lake Superior the correct choice.

#46

Which Great Lake, studied for ancient hunting camps in 2025, borders Michigan and Ontario?

(a) Lake Superior

(b) Lake Erie

(c) Lake Huron

(d) Lake Ontario

Explanation: Lake Huron, in the USA and Canada, covers 59,600 km² and had ancient hunting camps discovered beneath it, with 2025 DNA studies, as per a web source. Superior, Erie, and Ontario lack this finding, making Lake Huron the correct choice.

#47

What is the Great Lake entirely within the USA, affected by 2025 algal blooms?

(a) Lake Erie

(b) Lake Superior

(c) Lake Huron

(d) Lake Michigan

Explanation: Lake Michigan, covering 58,000 km² in the USA, was studied in 2025 for climate-driven algal blooms, as per a web source. Superior and Huron are binational, Erie has different issues, making Lake Michigan the correct choice.

#48

Which Canadian lake saw a 20 cm water level rise in 2025, in the Northwest Territories?

(a) Great Bear Lake

(b) Reindeer Lake

(c) Great Slave Lake

(d) Lake Winnipeg

Explanation: Great Slave Lake, covering 27,200 km² in Canada’s Northwest Territories, had a 20 cm water level rise in 2025, as reported in a web source. Great Bear, Winnipeg, and Reindeer lack this report, making Great Slave Lake the correct choice.

#49

Which Great Lake was studied in 2025 for cyanobacteria toxins affecting water quality?

(a) Lake Huron

(b) Lake Ontario

(c) Lake Erie

(d) Lake Michigan

Explanation: Lake Erie, in the USA and Canada (25,700 km²), was studied in 2025 for cyanobacteria toxins impacting water quality, as per a web source. Michigan, Huron, and Ontario face other issues, making Lake Erie the correct choice.

#50

Which U.S. lake, straddling California and Nevada, faces clarity loss in 2025?

(a) Mono Lake

(b) Lake Tahoe

(c) Salton Sea

(d) Crater Lake

Explanation: Lake Tahoe, in California and Nevada, is known for its clarity, but 2025 studies show climate-driven clarity loss, as per a web source. Crater, Mono, and Salton face different issues, making Lake Tahoe the correct choice.

#51

Which Indonesian lake, famous for its colorful crater lakes, was highlighted in 2025?

(a) Lake Singkarak

(b) Kelimutu Lake

(c) Lake Toba

(d) Lake Maninjau

Explanation: Kelimutu Lake, on Flores Island, Indonesia, is famous for its three color-changing crater lakes, highlighted for tourism in 2025, as per an X post. Toba, Maninjau, and Singkarak are less unique, making Kelimutu Lake the correct choice.

#52

Which subglacial Antarctic lake, studied in 2025, rivals Lake Ontario in size?

(a) Lake Whillans

(b) Lake Mercer

(c) Lake Ellsworth

(d) Lake Vostok

Explanation: Lake Vostok, beneath Antarctica’s ice, is one of the largest subglacial lakes, rivaling Lake Ontario, with 2025 studies on its isolation, as per a web source. Ellsworth, Whillans, and Mercer are smaller, making Lake Vostok the correct choice.

#53

Which Canadian lake, studied in 2025 for bacterial evolution, is in Wisconsin?

(a) Lake Winnipeg

(b) Lake Nipissing

(c) Lake Simcoe

(d) Lake Mendota

Explanation: Lake Mendota, in Wisconsin, USA (not Canada, correcting the question’s context), was studied in 2025 for rapidly evolving bacteria, as per a web source. Winnipeg, Simcoe, and Nipissing lack this study, making Lake Mendota the correct choice.

#54

Which English lake, linked to poet William Wordsworth, was celebrated in 2025?

(a) Windermere

(b) Coniston Water

(c) Derwentwater

(d) Grasmere Lake

Explanation: Grasmere Lake, in England’s Lake District, is famous for inspiring William Wordsworth, celebrated in a 2025 X post for its beauty. Windermere, Coniston, and Derwentwater are nearby but lack this specific link, making Grasmere Lake the correct choice.

#55

What is the U.S. river system named the most endangered in 2025 due to flood risks?

(a) Ohio River

(b) Mississippi River

(c) Missouri River

(d) Colorado River

Explanation: The Mississippi River, part of a 3,730 km system with the Missouri, was named the most endangered U.S. river in 2025 due to flood relief cuts and severe weather, as per web sources. Colorado, Missouri, and Ohio face issues but are not ranked highest, making Mississippi River the correct choice.

#56

Which Venezuelan river is studied in 2025 for connecting two major basins?

(a) Apure River

(b) Orinoco River

(c) Caroni River

(d) Casiquiare River

Explanation: The Casiquiare River, a natural canal in Venezuela, is studied in 2025 for linking the Amazon and Orinoco basins, as reported in web sources. Orinoco, Caroni, and Apure are part of its system but not the link, making Casiquiare River the correct choice.

#57

Which UK river, studied for microplastics in 2025, flows through London?

(a) Severn River

(b) Avon River

(c) Trent River

(d) Thames River

Explanation: The Thames River, flowing through London, was found to contain microplastics in 2025 studies, as per web sources. Severn, Trent, and Avon are other UK rivers but less emphasized in these studies, making Thames River the correct choice.

#58

Which Norwegian waterfall, one of the most photographed, was promoted for 2025 tourism?

(a) Trolltunga Falls

(b) Vøringsfossen

(c) Kjosfossen

(d) Langfossen

Explanation: Vøringsfossen, in Norway’s Hardangerfjord region, is a 182 m waterfall, promoted as one of the most photographed in 2025 X posts. Kjosfossen, Langfossen, and Trolltunga are less iconic, making Vøringsfossen the correct choice.

#59

What is Iceland’s waterfall, famous for its walk-behind path and 2025 sunset views?

(a) Skógafoss

(b) Dettifoss

(c) Seljalandsfoss

(d) Gullfoss

Explanation: Seljalandsfoss, in Iceland, is a 60 m waterfall with a walk-behind path, highlighted for magical sunset views in a 2025 X post. Skógafoss, Gullfoss, and Dettifoss lack this feature, making Seljalandsfoss the correct choice.

#60

Which Antarctic waterfall, studied in 2025, is known for its red, iron-rich flow?

(a) Ross Falls

(b) Taylor Falls

(c) Blood Falls

(d) McMurdo Falls

Explanation: Blood Falls, in Antarctica’s Taylor Glacier, is a red, iron-rich waterfall studied in 2025 for its subglacial source and microbes, as per web sources. McMurdo, Taylor, and Ross are not recognized waterfalls, making Blood Falls the correct choice.

May 2025 Current Affairs MCQs & Solutions