Continuing the Medcrux MCQ Series – Part 4 for INICET November 2025 and NEET PG 2026 preparation. Practice these 10 high-yield questions with explanations to strengthen your concepts efficiently.
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| Sharpen your concepts for NEET PG & INICET 2025 with Medcrux MCQs – Part 4 |
👉 Missed earlier parts? Check them here: Part 1 MCQs • Part 2 MCQs • Part 3 MCQs
🔹 MCQs with Explanations
1. Which layer is accountable for preserving the moisture and clarity of the cornea?
A) Descemet's membrane
B) Endothelium
C) Stroma
D) Corneal epithelium
✅ Correct Answer B) Endothelium
👉 The corneal endothelium is primarily responsible for maintaining the hydration and transparency of the cornea
2. In a patient with acute appendicitis, what is increased pain in the right lower quadrant when palpating the left lower quadrant called?
A) Dunphy's sign
B) Rovsing sign
C) Ilio-Psoas sign
D) Ten Horn sign
✅ Correct Answer is B) Rovsing sign:
👉 This pain is due to the backflow of gases from the colon into the inflamed right intestine when the left lower abdomen is palpated.
3. Microfilariae with sheathed tail and two nuclei at the tail is suggestive of?
A) Wuchereria bancrofti
B) Brugia malayi
C) Loa loa
D) Onchocerca volvulus
✅ Correct Answer B) Brugia malayi
👉 Sheathed microfilariae with 2 nuclei at the tip of the tail is suggestive of Brugia malayi.
4. Which of the following is not used for induction of anesthesia in pediatric patients?
A) Halothane
B) Sevoflurane
C) Desflurane
D) Nitrous oxide
✅ Correct Answer C) Desflurane
👉 Desflurane is not commonly used for the induction of anesthesia in pediatric patients.
👉 It is mainly used for the maintenance of anesthesia due to its pungent odor and potential airway irritation during induction.
5. Which nerve is most likely to be affected in a patient who complains of an inability to close the eye, drooling of saliva, and deviation of the angle of the mouth?
A) Facial nerve
B) Trigeminal nerve
C) Oculomotor nerve
D) Glossopharyngeal nerve
✅ Correct Answer A) Facial nerve
👉 The presentation of inability to close the eye, drooling of saliva, and deviation of the angle of the mouth is indicative of facial nerve palsy or Bell's palsy, which is caused by the dysfunction of the facial nerve.
👉 The facial nerve innervates the muscles of facial expression, including those involved in closing the eye, controlling the point of the mouth, and creating saliva.
6. What is the probable causative agent involved in the case of two individuals from a group of 20 friends who experienced nausea and vomiting in the early morning after consuming pastries from an external source during a late-night party?
A) Enterotoxin of staphylococcus
B) Emetic toxin of B. cereus
C) Verocytotoxin from E. coli
D) Shiga toxin from shigella
✅ Correct Answer A) Staphylococcus aureus
👉 The history of taking pastry and presentation of nausea and vomiting early in the morning is suggestive of food poisoning caused by enterotoxin of the Staphylococcus aureus.
👉 Staphylococcus aureus can produce enterotoxins in dairy items and meat that cause rapid-onset symptoms of nausea and vomiting, typically occurring within a few hours (within 6 hours) of ingesting contaminated food.
7. A 3-year-old child presents with fever, loose stools, and blood in the stool. Which enrichment medium is used to isolate the organism from the stool sample?
A) Robertson cooked meat broth
B) Alkaline peptone water
C) Selenite F broth
D) Brain heart infusion broth
✅ Correct Answer C) Selenite F broth
👉 The clinical presentation of the patient suggests the diagnosis of dysentery most commonly caused by salmonella, shigella species, or enteroinvasive coli.
👉 Among the options, Selenite F broth is an enrichment media for detecting Salmonella and Shigella species.
8. Which one of the following anesthetic agents shows the Robin Hood phenomenon?
A) Propofol
B) Ketamine
C) Etomidate
D) Thiopentone
✅ Correct Answer is D) Thiopentone
👉 Thiopentone causes cerebral vasoconstriction, reducing blood flow, volume, and ICP, but only in normal brain areas.
👉 Ischemic regions remain dilated due to vasomotor paralysis, allowing blood to redistribute from healthy to ischemic tissue, a process called the Robin Hood phenomenon or Reverse steal phenomenon.
9. What should be the subsequent course of action in managing a patient who arrives at the emergency department with epistaxis, despite unsuccessful attempts to stop the bleeding by pinching the nostrils and nasal packing?
A) Ligation of external carotid artery
B) Ligation of internal carotid artery
C) Ligation of sphenopalatine artery
D) Ligation of maxillary artery
✅ Correct Answer C) Ligation of sphenopalatine artery
👉 In this question, the patient presents with epistaxis.
👉 Pinching did not relieve it, and he continued to bleed after nasal packing.
👉 Ligation of arteries: First, the sphenopalatine artery, also known as the artery of epistaxis, is ligated.
👉 If surgery fails, embolization should be performed.
10. Which type of reaction is the Schultz-Dale phenomenon?
A) Type I hypersensitivity reaction
B) Type II hypersensitivity reaction
C) Type III hypersensitivity reaction
D) Type IV hypersensitivity reaction
✅ Correct Answer is A) Type I hypersensitivity reaction
👉 Schultz-Dale phenomenon:
👉 Type I hypersensitivity reaction.
👉 It describes in-vitro contraction of smooth muscles that have been exposed to antigens, demonstrating immediate hypersensitivity reaction in some human and animal tissues.
🔹 Clinical Pearls 💡
- 👉 Corneal endothelium maintains corneal clarity and hydration.
- 👉 Rovsing sign indicates pain referral in acute appendicitis.
- 👉 Selenite F broth is key for Salmonella/Shigella enrichment.
🔹 Final Notes
That’s it for Part 4 of the Medcrux MCQ Series.
Keep practicing — MCQs with explanations and clinical pearls are an efficient way to prepare smartly for your exams.
👉 Looking for more resources?
Check out Part 1 of Medcrux MCQs, Part 2, Part 3, or my other blog 👉 Mediflips 📚💉
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