📝 Step 5 — KMU Past Papers & Exam Learning

This section contains KMU-style past paper questions designed to strengthen conceptual understanding. Focus on understanding explanations rather than memorizing answers.

🎯 How to Study KMU Past Papers

• Read the question carefully.
• Think about the answer before looking.
• Read the explanation slowly.
• Understand the reasoning behind the correct answer.
• Revise difficult questions again.

MCQ 1

Question:
A patient has gradual narrowing of the left internal carotid artery but remains neurologically stable for some time. Which anatomical arrangement best explains this compensation?

Options:
Direct venous drainage from cerebral cortex
CSF flow through ventricular system
Arterial anastomosis at base of brain
Sympathetic supply to cerebral vessels
Lymphatic drainage of meninges

Correct Answer:
Arterial anastomosis at base of brain

Explanation:
The Circle of Willis provides collateral arterial communication between anterior and posterior cerebral circulations, which may compensate during gradual arterial narrowing.

MCQ 2

Question:
During dissection of the brain base, an arterial circle is seen surrounding the optic chiasma and infundibulum. Which vessel contributes to its posterior part?

Options:
Anterior communicating artery
Middle cerebral artery
Ophthalmic artery
Superior cerebellar artery
Posterior cerebral artery

Correct Answer:
Posterior cerebral artery

Explanation:
The posterior cerebral arteries form the posterior part of the Circle of Willis and connect with the internal carotid system through posterior communicating arteries.

MCQ 3

Question:
A vascular lesion damages the lateral surface of the left cerebral hemisphere. Which clinical finding is most consistent with this territory?

Options:
Right leg weakness more than arm
Left leg weakness more than arm
Right face and arm weakness
Bilateral lower limb weakness
Left visual loss only

Correct Answer:
Right face and arm weakness

Explanation:
The lateral cerebral hemisphere is mainly supplied by the middle cerebral artery and contains face and upper limb motor areas.

MCQ 4

Question:
A patient develops sudden right lower limb weakness with relative sparing of the face and arm. The most likely cortical territory involved is supplied by which artery?

Options:
Middle cerebral artery
Posterior cerebral artery
Anterior choroidal artery
Anterior cerebral artery
Posterior communicating artery

Correct Answer:
Anterior cerebral artery

Explanation:
The anterior cerebral artery supplies the medial surface of the hemisphere, where the lower limb area of the motor cortex is located.

MCQ 5

Question:
A small infarct produces severe contralateral weakness of face, arm, and leg. Which anatomical feature best explains the severity of this deficit?

Options:
Condensation of descending fibers in internal capsule
Wide separation of cortical motor neurons
Bilateral supply of spinal anterior horns
Segmental distribution of cranial nerve nuclei
Diffuse arrangement of cerebellar pathways

Correct Answer:
Condensation of descending fibers in internal capsule

Explanation:
The internal capsule contains compact corticospinal and corticobulbar fibers, so a small lesion can produce dense hemiplegia.

MCQ 6

Question:
A lesion of the corticospinal tract above the pyramidal decussation causes weakness on the opposite side. Which anatomical fact explains this finding?

Options:
Motor cortex has bilateral limb control
Cerebellar pathways control voluntary power
Most pyramidal fibers cross in lower medulla
Anterior horn cells cross in spinal cord
Sensory fibers cross in cerebral cortex

Correct Answer:
Most pyramidal fibers cross in lower medulla

Explanation:
Most corticospinal fibers decussate in the lower medulla; therefore, lesions above this level produce contralateral motor weakness.

MCQ 7

Question:
A patient has sudden hemiplegia with increased tendon reflexes developing after the acute phase. Which pathway is primarily involved?

Options:
Spinothalamic tract
Dorsal column pathway
Vestibulospinal tract
Reticulospinal tract
Corticospinal tract

Correct Answer:
Corticospinal tract

Explanation:
Stroke affecting the corticospinal pathway produces upper motor neuron weakness with increased tone and exaggerated reflexes after the acute phase.

MCQ 8

Question:
A stroke patient has sudden visual field loss without prominent limb weakness. Which vascular territory is most likely involved?

Options:
Anterior cerebral artery
Posterior cerebral artery
Middle cerebral artery
Anterior communicating artery
Lenticulostriate arteries

Correct Answer:
Posterior cerebral artery

Explanation:
The posterior cerebral artery supplies the occipital lobe, including the visual cortex, so lesions commonly produce visual field defects.

MCQ 9

Question:
A hypertensive patient suddenly develops severe headache, vomiting, and reduced consciousness with focal neurological deficit. Which mechanism best explains this presentation?

Options:
Slow cortical degeneration
Reversible synaptic fatigue
Meningeal venous congestion
Bleeding with pressure effect
Peripheral nerve demyelination

Correct Answer:
Bleeding with pressure effect

Explanation:
Hemorrhagic stroke causes bleeding into or around brain tissue, leading to tissue compression, raised intracranial pressure, and neurological deficits.

MCQ 10

Question:
A patient with atrial fibrillation develops sudden neurological deficit. Which process most likely produced the cerebral lesion?

Options:
Embolus lodging in cerebral artery
Inflammation of cerebral cortex
Compression by enlarged ventricle
Rupture of venous sinus
Failure of CSF absorption

Correct Answer:
Embolus lodging in cerebral artery

Explanation:
Atrial fibrillation can produce thrombi in the heart that embolize to cerebral arteries and cause ischemic stroke.

MCQ 11

Question:
A man with long-standing hypertension develops a small deep cerebral infarct. Which vessels are commonly implicated in such lesions?

Options:
Dural venous sinuses
Superficial cortical veins
Small penetrating arteries
Choroid plexus vessels
External carotid branches

Correct Answer:
Small penetrating arteries

Explanation:
Hypertension commonly damages small penetrating arteries supplying deep brain structures such as the internal capsule.

MCQ 12

Question:
A patient develops sudden aphasia with right face and arm weakness. Which arterial territory best explains this combination?

Options:
Right anterior cerebral artery
Right posterior cerebral artery
Left posterior communicating artery
Right vertebral artery
Left middle cerebral artery

Correct Answer:
Left middle cerebral artery

Explanation:
The dominant middle cerebral artery supplies language areas and lateral motor cortex controlling the opposite face and upper limb.

MCQ 13

Question:
Which preventive approach best targets the common vascular mechanism shared by hypertension, diabetes, smoking, and dyslipidemia?

Options:
Increasing CSF production
Reducing endothelial injury
Stimulating cerebral cortex
Improving cranial nerve reflexes
Increasing venous pressure

Correct Answer:
Reducing endothelial injury

Explanation:
Major vascular risk factors promote endothelial injury, atherosclerosis, thrombosis, and vessel wall damage; prevention reduces these processes.

MCQ 14

Question:
A patient presents with acute hemiplegia. Before giving antithrombotic treatment, which investigation is most important to exclude bleeding?

Options:
Serum calcium level
Chest radiograph
Urine routine examination
Non-contrast CT brain
Pulmonary function test

Correct Answer:
Non-contrast CT brain

Explanation:
CT brain is commonly used early to distinguish hemorrhagic stroke from ischemic stroke before treatment decisions.

MCQ 15

Question:
Which patient has the strongest modifiable risk profile for future cerebrovascular disease?

Options:
A smoker with uncontrolled hypertension and diabetes
A young adult with corrected myopia
A student with seasonal allergic rhinitis
A patient with healed skin infection
A person with mild dental caries

Correct Answer:
A smoker with uncontrolled hypertension and diabetes

Explanation:
Hypertension, diabetes, and smoking are major modifiable risk factors that increase vascular injury and stroke risk.

MCQ 16

Question:
A patient with sudden weakness is found to have very low blood glucose. Why is this test important in suspected stroke?

Options:
It confirms hemorrhagic stroke
It identifies a stroke mimic
It localizes cortical infarction
It measures carotid stenosis
It detects aneurysm rupture

Correct Answer:
It identifies a stroke mimic

Explanation:
Hypoglycemia can produce neurological symptoms resembling stroke and should be checked early in acute neurological deficit.

MCQ 17

Question:
A patient with left internal capsule involvement develops right-sided weakness. Which additional deficit may occur if corticobulbar fibers are affected?

Options:
Right lower facial weakness
Left lower limb sensory loss only
Bilateral visual field loss
Right cerebellar tremor only
Left hearing loss only

Correct Answer:
Right lower facial weakness

Explanation:
Corticobulbar fibers pass through the internal capsule; supranuclear involvement can produce contralateral lower facial weakness.

MCQ 18

Question:
Which statement best integrates Circle of Willis anatomy with clinical stroke protection?

Options:
It drains venous blood from cortex
It produces cerebrospinal fluid
It guarantees equal flow in all arteries
It prevents all embolic strokes
It may provide alternate arterial flow

Correct Answer:
It may provide alternate arterial flow

Explanation:
The Circle of Willis provides potential collateral arterial flow, but protection depends on its completeness and the speed of occlusion.

MCQ 19

Question:
A patient has sudden right hemiplegia due to a lesion in the left cerebral hemisphere. Which principle best explains the side of weakness?

Options:
Ipsilateral cortical representation
Bilateral supply of motor cortex
Contralateral pyramidal control
Segmental spinal inhibition
Cerebellar motor initiation

Correct Answer:
Contralateral pyramidal control

Explanation:
Most corticospinal fibers cross in the medulla, so cerebral hemisphere lesions produce motor deficits on the opposite side.

MCQ 20

Question:
A public health program aims to reduce first-ever stroke in a community. Which strategy is most appropriate?

Options:
Screening adults for raised blood pressure
Treating spasticity after hemiplegia
Providing speech therapy after aphasia
Managing contractures after paralysis
Rehabilitating chronic stroke survivors

Correct Answer:
Screening adults for raised blood pressure

Explanation:
Primary prevention focuses on identifying and controlling risk factors before stroke occurs; hypertension screening is a key strategy.

📌 Important Exam Strategy

KMU examinations often test integrated understanding rather than isolated facts. Focus on linking anatomy, embryology, histology, and clinical concepts when reviewing questions.

✅ Revision Tip

If you can explain the reason behind the correct answer without looking at notes, your concept is strong.