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UPSC Prelims 2027 CGS Test-16
UPSC Prelims 2027 CGS Test-16
1. Consider the following plants:
- Azolla
- Pistia
- Salvinia
- Nymphaea
Which of the above are aquatic ferns?
[A] 2 and 4 only
[B] 1 and 3 only
[C] 2 and 3 only
[D] 1 and 4 only
Show Answer
Correct Answer: B [1 and 3 only]
Notes:
Azolla and Salvinia are aquatic ferns in the family Salviniaceae, so statements 1 and 3 are correct. Pistia, or water lettuce, is a flowering plant in the arum family, Araceae. Nymphaea comprises water lilies, which are also flowering plants. Therefore, statements 2 and 4 are not aquatic ferns, and the correct choice is 1 and 3 only.
2. Which of the following countries are members of both ASEAN and BIMSTEC?
- Myanmar
- Laos
- Vietnam
- Thailand
Select the correct option from the codes given below:
[A] 1 and 3 only
[B] 2 and 4 only
[C] 2 and 3 only
[D] 1 and 4 only
Show Answer
Correct Answer: D [1 and 4 only]
Notes:
Myanmar and Thailand are members of both ASEAN and BIMSTEC. Laos and Vietnam are ASEAN members but are not members of BIMSTEC. BIMSTEC has seven members: Bangladesh, Bhutan, India, Myanmar, Nepal, Sri Lanka and Thailand. Thus, only countries 1 and 4 belong to both organisations.
3. Consider the following countries:
- Malaysia
- Bangladesh
- Cambodia
- Vietnam
Which of the above are traversed by the Mekong main river?
[A] 3 and 4 only
[B] 1 and 3 only
[C] 2 and 3 only
[D] 1 and 4 only
Show Answer
Correct Answer: A [3 and 4 only]
Notes:
Malaysia is not on the Mekong’s main course, and Bangladesh lies outside its route. The river passes through Cambodia before reaching Vietnam, where its delta spreads towards the sea. Its main course also involves China, Myanmar, Laos and Thailand. Therefore, Cambodia and Vietnam are the countries listed that are traversed by the Mekong main river.
4. Consider the following geological periods:
- Jurassic
- Cretaceous
- Paleogene
- Triassic
Which of the above are the first and final periods of the Mesozoic Era?
[A] 1 and 3 only
[B] 1 and 4 only
[C] 2 and 3 only
[D] 2 and 4 only
Show Answer
Correct Answer: D [2 and 4 only]
Notes:
- Item 1 is incorrect: The Jurassic is the middle Mesozoic period, not its first or final period.
- Item 2 is correct: The Cretaceous is the third and final Mesozoic period.
- Item 3 is incorrect: The Paleogene begins the Cenozoic Era, after the Cretaceous.
- Item 4 is correct: The Triassic is the first period of the Mesozoic, preceding the Jurassic.
5. A major hydropower project is proposed in Medog, Tibet. With reference to major hydroelectric dams, consider the following pairs:
- Hoover Dam — Rio Grande
- Itaipu Dam — Amazon River
- Aswan High Dam — Nile River
- Three Gorges Dam — Yangtze River
Which of the pairs given above are correctly matched?
[A] 2 and 4 only
[B] 1 and 3 only
[C] 2, 3 and 4 only
[D] 3 and 4 only
Show Answer
Correct Answer: A [2 and 4 only]
Notes:
Pairs 1 and 2 are incorrectly matched: Hoover Dam is on the Colorado River, while Itaipu Dam spans the Paraná River on the Brazil–Paraguay border. The Aswan High Dam is built across the Nile in Egypt, and the Three Gorges Dam spans the Yangtze River in China. Therefore, only pairs 3 and 4 are correctly matched.
Originally written on
October 30, 2026
and last modified on
October 30, 2026.
