UPSC Current Affairs Quiz: February 25, 2025
February 25, 2025 February 25, 2025
1. With reference to Perovskite Nanocrystals, often seen in news, consider the following:
- The chemical name of such crystals is calcium titanium oxide, originally discovered in the Ural Mountains.
- They exhibit very high photoluminescence quantum yields (PLQY).
- They can self-heal from some types of defects when exposed to light.
Select the correct option from the codes given below:
[A] Only 1 and 2
[B] Only 2 and 3
[C] 1, 2 and 3
[D] Only 1
Show Answer
Correct Answer: C [1, 2 and 3]
Notes:- The term Perovskite originally refers to a mineral (calcium titanium oxide, CaTiO₃) discovered in Ural Mountains of Russia and named after Russian mineralogist Lev Perovski.
- Perovskite nanocrystals exhibit very high photoluminescence quantum yields (PLQY), often exceeding 90%.
- These nanocrystals can self-heal from some types of defects when exposed to light, maintaining their photostability, a crucial factor in their potential for long-lasting optoelectronic devices.
2. Consider the following statements:
- Statement-I: Extinction filtering occurs when sensitive species disappear due to human disturbances, leaving behind only those that can thrive in degraded environments.
- Statement-II: Increasing the size of protected areas is sufficient to prevent biodiversity loss in ecosystems.
Which one of the following is correct in respect of the above statements?
[A] Both Statement-I and Statement-II are correct and Statement-II explains Statement-I
[B] Both Statement-I and Statement-II are correct, but Statement-II does not explain Statement-I
[C] Statement-I is correct, but Statement-II is incorrect
[D] Statement-I is incorrect, but Statement-II is correct
Show Answer
Correct Answer: C [Statement-I is correct, but Statement-II is incorrect]
Notes:Statement-I:- This statement is correct.
- Extinction filtering leads to a decline in biodiversity as sensitive species are unable to cope with human-induced changes.
Statement-II:
- This statement is incorrect.
- Simply expanding protected areas does not address the threats posed by human activities outside these zones, which are critical for biodiversity conservation.
3. Consider the following pairs:
| Species | Known For |
| Javan Rhinoceros | Most endangered large mammal species |
| Sumatran Orangutan | Only great ape species found outside Africa |
| Mountain Gorilla | Largest primate species |
How many of the above pairs are correctly matched?
[A] Only one pair
[B] Only two pairs
[C] All three pairs
[D] None of the pairs
Show Answer
Correct Answer: C [All three pairs]
Notes:- Javan Rhinoceros: It is indeed the most endangered large mammal species, with only about 76 individuals remaining in the wild, all in Ujung Kulon National Park, Indonesia.
- Sumatran Orangutan: This species is the only great ape found outside of Africa, residing exclusively on the island of Sumatra, Indonesia, and is critically endangered.
- Mountain Gorilla: It is the largest primate species, with males weighing up to 440 pounds, and is also critically endangered, primarily found in the Virunga Mountains of Central Africa.
Thus, all three pairs are correct.
4. Regarding movements in India’s agricultural history, consider the following statements:
- The Champaran Satyagraha in 1917 was led by Mahatma Gandhi against oppressive plantation systems in Bihar.
- The Kheda Satyagraha in 1918 sought relief for farmers affected by famine and high taxes in Gujarat.
- The Bardoli Satyagraha in 1928 was a successful campaign against increased land revenue assessments in Gujarat.
How many of the above statements are correct?
[A] Only one
[B] Only two
[C] All three
[D] None
Show Answer
Correct Answer: C [All three]
Notes:- The Champaran Satyagraha in 1917 was led by Mahatma Gandhi against oppressive plantation systems in Bihar: This is correct. It marked Gandhi’s first active involvement in Indian politics.
- The Kheda Satyagraha in 1918 sought relief for farmers affected by famine and high taxes in Gujarat: This is correct. It resulted in the suspension of tax collection for the affected farmers.
- The Bardoli Satyagraha in 1928 was a successful campaign against increased land revenue assessments in Gujarat: This is correct. It is often cited as a victory for the Indian farmers and strengthened Gandhi’s leadership.
Thus, all the statements are correct. The correct answer is (C) All three.
5. With reference to tiger conservation and tribal communities, consider the following statements:
- The Soliga tribes worship tigers and have a temple dedicated to them.
- The Soliga tribes were the first to have their forest rights recognized in a tiger reserve in India.
- In 2018, the tiger population in BRT Tiger Reserve was reported to be 86.
- The Soliga tribes practice sustainable harvesting of forest produce, leaving a portion for wildlife.
How many of the above statements are correct?
[A] Only one
[B] Only two
[C] All four
[D] None
Show Answer
Correct Answer: C [All four]
Notes:- The Soliga tribes worship tigers and have a temple dedicated to them: True, they regard tigers as sacred and have cultural rituals associated with them.
- The Soliga tribes were the first to have their forest rights recognized in a tiger reserve in India: True, they achieved this landmark recognition through a court judgment.
- In 2018, the tiger population in BRT Tiger Reserve was reported to be 86: True, this figure reflects an increase from previous counts.
- The Soliga tribes practice sustainable harvesting of forest produce, leaving a portion for wildlife: True, this practice demonstrates their commitment to biodiversity conservation.
Thus, all four statements are correct.
The above questions are part of Daily UPSC 20 Current Affairs MCQs Series in GKToday Android Application. This series can be subscribed in the app only for user friendly test with detailed answers and explanations.
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