Explanation
- A
Canada and the United States of America
Canada–USA. The world’s longest land border.
- B
Chile and Argentina
Chile–Argentina. Long Andean border, not the longest worldwide.
- C
China and India
China–India. Long, disputed, not the global maximum.
- D
Kazakhstan and Russian Federation
Kazakhstan–Russia. Very long, still shorter than Canada–USA.
Summary. Official key is (a) Canada and the United States. That land boundary is the longest between any two countries. The other pairs are long regional borders, not the world record.
Same topic · past papers
UPSC has asked this before
These previous-year questions sit on the same topic. Open one to practise the earlier ask.
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2022 · Q29 · General Studies · 2 marks
In the northern hemisphere, the longest day of the year normally occurs in the: -
2026 · Q26 · General Studies · 2 marks
Which of the following with reference to Indian States is/are NOT correct? 1. Uttar Pradesh shares its boundary with the highest number of other Indian States. 2. Rajasthan shares the longest international border among all Indian States. 3. Sikkim is the only State that shares its boundary with just one other Indian State. Select the answer using the code given below: