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10 multiple-choice questions on East and Southeast Asia, about 6% of the High School World Geography bank. Every one carries a written rationale.
East and Southeast Asia is one of 16 chapters in CoStudy's High School World Geography bank, and it holds 10 of the bank's 170 multiple-choice questions — roughly 6% of the total. That proportion is not arbitrary: chapters follow the certifying body's published exam outline, and the number of questions in each is set by that domain's published weight, so the share of your practice time this chapter takes matches the share of the real exam it accounts for.
Studying by chapter is worth doing once you have a diagnostic score. A single overall percentage tells you whether you are close; it does not tell you which domain is dragging. Working a weak chapter in isolation, and re-testing it in isolation, is the fastest way to move a score that has stalled — and it is why the mock exams in CoStudy report by domain rather than as one number.
4 questions drawn from this chapter, with the full rationale shown — the controlling principle behind the right answer, and why each wrong option tempts and fails.
The world's most populous country as of 2026 is India, followed by:
Answer: C — China
China (~1.41B) sits at #2 after India (~1.43B) since ~2023. A common trap: outdated 'China #1' answer.
Japan's core industrial and population belt runs along:
Answer: B — The Pacific coast of Honshu from Tokyo to Osaka (Taiheiyō Belt)
The Taiheiyō (Pacific) Belt from Tokyo through Nagoya to Osaka concentrates Japan's cities and industry. Japan's mountainous interior is thinly populated.
Which of these Southeast Asian countries is the world's largest Muslim-majority nation?
Answer: C — Indonesia
Indonesia (~275M, ~87% Muslim) is the world's largest Muslim-majority country. Philippines is majority Catholic; Thailand is majority Buddhist.
Which archipelagic country in Southeast Asia is composed of over 7,000 islands?
Answer: B — The Philippines (~7,000+)
The Philippines has ~7,641 islands. Indonesia (~17,500+) is even more archipelagic — an easy overshoot if you rely on 'most islands' shortcut.
These are a sample. The full East and Southeast Asia chapter runs 10 items with per-chapter progress tracking, on the web and in the iOS app.
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