Prelims Mantra (Practice Questions) (5th & 6th /01/2026)
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Prelims Mantra (Practice Questions) (5th & 6th /01/2026)
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Question 1 of 5
1. Question
Consider the following statements regarding spina bifida:
Statement I: Spina bifida is caused by incomplete closure of the neural tube during early pregnancy.
Statement II: Adequate intake of folic acid before conception can significantly reduce the risk of spina bifida.
Which one of the following is correct in respect of the above statements?
CorrectAnswer: A
Explanation:
Statement I is correct:
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- Spina bifida is a congenital neural tube defect (NTD).
- During the first 28 days of pregnancy, the neural tube fails to close completely, resulting in defects of the spinal cord and vertebrae.
- This is a well-established embryological cause.
Statement II is also correct:
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- Folic acid (Vitamin B9) is essential for neural tube formation.
- Adequate intake before conception and during early pregnancy significantly reduces the incidence of spina bifida.
- Public health programs like Anaemia Mukt Bharat and preconception folic acid supplementation emphasize this.
- Neural tube closure depends on sufficient folic acid levels.
- Deficiency in folic acid is a direct causal factor for incomplete closure, leading to spina bifida.
IncorrectAnswer: A
Explanation:
Statement I is correct:
-
- Spina bifida is a congenital neural tube defect (NTD).
- During the first 28 days of pregnancy, the neural tube fails to close completely, resulting in defects of the spinal cord and vertebrae.
- This is a well-established embryological cause.
Statement II is also correct:
-
- Folic acid (Vitamin B9) is essential for neural tube formation.
- Adequate intake before conception and during early pregnancy significantly reduces the incidence of spina bifida.
- Public health programs like Anaemia Mukt Bharat and preconception folic acid supplementation emphasize this.
- Neural tube closure depends on sufficient folic acid levels.
- Deficiency in folic acid is a direct causal factor for incomplete closure, leading to spina bifida.
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Question 2 of 5
2. Question
Consider the following statements:
Statement-I: The double-humped Bactrian camel is found in India only in the Ladakh region.
Statement-II: The Bactrian camel is adapted to hot desert conditions similar to the Thar Desert.
Which one of the following is correct in respect of the above statements?
CorrectAnswer: C
Explanation:
Statement I is correct:
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- In India, Bactrian camels are restricted to Ladakh, especially the Nubra Valley.
- No natural population exists in Rajasthan or other hot deserts.
Statement II is incorrect:
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- Bactrian camels are adapted to cold deserts, not hot deserts.
- Thar Desert camels are single-humped Dromedary camels, a different species.
IncorrectAnswer: C
Explanation:
Statement I is correct:
-
- In India, Bactrian camels are restricted to Ladakh, especially the Nubra Valley.
- No natural population exists in Rajasthan or other hot deserts.
Statement II is incorrect:
-
- Bactrian camels are adapted to cold deserts, not hot deserts.
- Thar Desert camels are single-humped Dromedary camels, a different species.
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Question 3 of 5
3. Question
Consider the following statements regarding notifiable diseases:
1. Notification of diseases helps public authorities in surveillance and outbreak control.
2. The list of notifiable diseases is uniform across all States in India.
3. Tuberculosis is a notifiable disease in India.
Which of the statements given above are correct?
CorrectAnswer: B
Explanation:
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- Notification enables early warning systems, resource mobilisation and containment measures.
- Core to public health surveillance.
- Public health is a State subject (State List, Seventh Schedule).
- Hence, States can notify different diseases depending on local epidemiology.
- Tuberculosis is mandatorily notifiable in India to ensure:
- Tracking of cases
- Inclusion of private sector data
- Progress towards TB elimination
IncorrectAnswer: B
Explanation:
-
- Notification enables early warning systems, resource mobilisation and containment measures.
- Core to public health surveillance.
- Public health is a State subject (State List, Seventh Schedule).
- Hence, States can notify different diseases depending on local epidemiology.
- Tuberculosis is mandatorily notifiable in India to ensure:
- Tracking of cases
- Inclusion of private sector data
- Progress towards TB elimination
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Question 4 of 5
4. Question
Consider the following statements about Popocatépetl volcano:
Statement I: Popocatépetl is an active volcano associated with a subduction zone.
Statement II: It is located in the Circum-Pacific Ring of Fire.
Which one of the following is correct in respect of the above statements?
CorrectAnswer: A
Explanation:
-
- Popocatépetl is an active stratovolcano in central Mexico.
- Its formation is due to subduction of the Cocos Plate beneath the North American Plate, a classic subduction-zone volcanism.
- Eruptive style: explosive, producing ash plumes and pyroclastic flows.
- Popocatépetl lies in Mexico, which is part of the Circum-Pacific Ring of Fire, a zone of high seismic and volcanic activity.
- The Ring of Fire exists due to subduction zones around the Pacific Plate, which is exactly why Popocatépetl is associated with a subduction zone.
IncorrectAnswer: A
Explanation:
-
- Popocatépetl is an active stratovolcano in central Mexico.
- Its formation is due to subduction of the Cocos Plate beneath the North American Plate, a classic subduction-zone volcanism.
- Eruptive style: explosive, producing ash plumes and pyroclastic flows.
- Popocatépetl lies in Mexico, which is part of the Circum-Pacific Ring of Fire, a zone of high seismic and volcanic activity.
- The Ring of Fire exists due to subduction zones around the Pacific Plate, which is exactly why Popocatépetl is associated with a subduction zone.
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Question 5 of 5
5. Question
Consider the following statements about Socotra Island:
1. Socotra Island is part of Yemen.
2. The island is located in the Gulf of Aden, near the Arabian Sea.
3. It is home to the Dragon’s Blood Tree and other endemic species.
4. Socotra has been administered as a special territory of Oman.
How many of the above statements are correct?
CorrectAnswer: C
Explanation:
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- Socotra is politically part of Yemen.
- Located in the Arabian Sea, near the Gulf of Aden.
- Famous for high endemic biodiversity, including Dragon’s Blood Tree.
- It is not a territory of Oman, though Oman historically influenced the region.
IncorrectAnswer: C
Explanation:
-
- Socotra is politically part of Yemen.
- Located in the Arabian Sea, near the Gulf of Aden.
- Famous for high endemic biodiversity, including Dragon’s Blood Tree.
- It is not a territory of Oman, though Oman historically influenced the region.
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