📝 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 student standing upright depends on continuous activity of antigravity muscles. Which spinal mechanism mainly supports this resting postural activity?
Options:
Golgi tendon inhibition
Stretch reflex loop
Pain withdrawal arc
Flexor reflex pattern
Cortical motor planning
Correct Answer:
Stretch reflex loop
Explanation:
Resting muscle tone is mainly maintained by the stretch reflex through muscle spindle input, Ia afferents, and alpha motor neuron activation.
MCQ 2
Question:
During maintenance of tone, gamma motor neuron activity is most important because it:
Options:
Inhibits alpha motor neurons
Contracts extrafusal fibers
Maintains spindle sensitivity
Blocks sensory afferents
Suppresses tendon reflexes
Correct Answer:
Maintains spindle sensitivity
Explanation:
Gamma motor neurons contract intrafusal fibers, keeping muscle spindles taut and responsive during posture and movement.
MCQ 3
Question:
A patient has brisk knee jerk, ankle clonus, and increased resistance during rapid passive movement. Which physiological change best explains these findings?
Options:
Reduced Ia afferent discharge
Excessive cerebellar inhibition
Hyperexcitable stretch reflexes
Failure of neuromuscular transmission
Loss of muscle spindle receptors
Correct Answer:
Hyperexcitable stretch reflexes
Explanation:
UMN lesions remove descending inhibitory control, making spinal stretch reflexes hyperexcitable and producing spasticity and clonus.
MCQ 4
Question:
A lesion damages anterior horn cells at the lumbar level. Which combination of findings is most expected in affected muscles?
Options:
Spasticity with clonus
Flaccidity with wasting
Rigidity with tremor
Ataxia with hypotonia
Weakness with hyperreflexia
Correct Answer:
Flaccidity with wasting
Explanation:
Anterior horn cells are lower motor neurons. Their damage causes denervation, flaccidity, reduced reflexes, and marked wasting.
MCQ 5
Question:
A patient develops weakness after corticospinal tract damage, but the peripheral nerve supply to muscle remains intact. Which finding is most consistent with this lesion?
Options:
Fasciculations
Marked wasting
Reduced tone
Extensor plantar response
Absent tendon reflexes
Correct Answer:
Extensor plantar response
Explanation:
Corticospinal tract damage produces UMN signs, including Babinski response, hyperreflexia, and spasticity after the acute phase.
MCQ 6
Question:
After acute traumatic spinal cord injury, a patient initially shows absent tendon reflexes below the lesion. Which explanation is most appropriate?
Options:
Permanent anterior horn loss
Temporary spinal circuit inactivity
Selective dorsal column injury
Primary cerebellar dysfunction
Peripheral nerve degeneration
Correct Answer:
Temporary spinal circuit inactivity
Explanation:
Spinal shock causes transient loss of reflex, motor, sensory, and autonomic function below the lesion due to sudden loss of descending input.
MCQ 7
Question:
A patient with chronic spinal cord lesion has increased lower limb tone after an earlier flaccid phase. What explains this clinical transition?
Options:
Recovery of cortical control
Return of spinal reflex excitability
Regeneration of pyramidal tract
Destruction of muscle spindles
Improved peripheral nerve conduction
Correct Answer:
Return of spinal reflex excitability
Explanation:
After spinal shock, reflex circuits recover but lack normal descending inhibition, leading to hyperreflexia and spasticity.
MCQ 8
Question:
In a right-sided spinal cord hemisection, which sensory deficit is expected below the lesion due to dorsal column involvement?
Options:
Left pain loss
Right vibration loss
Bilateral touch loss
Left proprioception loss
Right temperature loss
Correct Answer:
Right vibration loss
Explanation:
Dorsal column fibers ascend ipsilaterally in the spinal cord, so hemisection causes same-side loss of vibration and proprioception.
MCQ 9
Question:
A left-sided spinal cord hemisection damages the spinothalamic tract. Which deficit is most likely below the lesion?
Options:
Left vibration loss
Left motor paralysis
Right pain loss
Right proprioception loss
Bilateral LMN paralysis
Correct Answer:
Right pain loss
Explanation:
Pain and temperature fibers cross in the spinal cord and ascend contralaterally, so spinothalamic damage causes opposite-side pain-temperature loss.
MCQ 10
Question:
A patient has ipsilateral spastic weakness and loss of position sense with contralateral loss of pain below a spinal lesion. Which tract combination is mainly involved?
Options:
Corticospinal, dorsal column, spinothalamic
Vestibulospinal, rubrospinal, reticulospinal
Posterior root, anterior root, central canal
Spinocerebellar, vestibular, olivary
Dorsal column, medial lemniscus, optic tract
Correct Answer:
Corticospinal, dorsal column, spinothalamic
Explanation:
Brown-Séquard syndrome involves ipsilateral corticospinal and dorsal column loss with contralateral spinothalamic loss.
MCQ 11
Question:
A spinal cord lesion produces LMN signs at the level of injury and UMN signs below it. What best explains this mixed pattern?
Options:
Local anterior horn damage with tract interruption
Bilateral cerebellar cortex degeneration
Peripheral nerve injury with intact cord
Isolated dorsal root ganglion damage
Pure neuromuscular junction failure
Correct Answer:
Local anterior horn damage with tract interruption
Explanation:
At the lesion level, anterior horn cells or roots may be damaged causing LMN signs; below the lesion, descending tract interruption causes UMN signs.
MCQ 12
Question:
In paraplegia due to spinal cord disease, which finding most helps localize the lesion to the cord rather than isolated muscle disease?
Options:
General fatigue
Sensory level
Mild headache
Joint stiffness
Reduced appetite
Correct Answer:
Sensory level
Explanation:
A sensory level on the trunk strongly suggests spinal cord involvement because sensory tracts are interrupted below a segmental level.
MCQ 13
Question:
A patient with paraplegia also has urinary retention and bilateral sensory loss below the umbilicus. Which structure is most likely involved?
Options:
Cerebellar hemisphere
Spinal cord pathways
Facial motor nucleus
Optic radiation
Cochlear nerve
Correct Answer:
Spinal cord pathways
Explanation:
Motor, sensory, and autonomic dysfunction together strongly suggest spinal cord involvement rather than a purely peripheral or cranial lesion.
MCQ 14
Question:
Which cause of paraplegia requires urgent recognition because delay may lead to irreversible cord damage?
Options:
Simple muscle strain
Spinal cord compression
Mild peripheral neuropathy
Benign postural fatigue
Transient joint stiffness
Correct Answer:
Spinal cord compression
Explanation:
Cord compression from trauma, tumor, abscess, disc, or tuberculosis is an emergency because prolonged compression may cause permanent paraplegia.
MCQ 15
Question:
A patient has sudden right-sided weakness involving face, arm, and leg with brisk reflexes. Which site best explains this pattern?
Options:
Left cerebral motor pathway
Right anterior horn cells
Left peripheral nerves
Right dorsal columns
Left cauda equina roots
Correct Answer:
Left cerebral motor pathway
Explanation:
Stroke affecting the motor cortex or internal capsule causes contralateral UMN weakness, commonly involving face, arm, and leg.
MCQ 16
Question:
In ischemic stroke, failure of ATP-dependent ion pumps first leads to which cellular consequence?
Options:
Neuronal swelling
Muscle denervation
Spindle rupture
Axonal remyelination
Synaptic regeneration
Correct Answer:
Neuronal swelling
Explanation:
Reduced oxygen and glucose decrease ATP, causing ion pump failure, sodium-water influx, cellular swelling, and neuronal injury.
MCQ 17
Question:
Hemorrhagic stroke produces neurological deficit mainly through bleeding and:
Options:
Muscle spindle activation
Tissue compression
Peripheral nerve rupture
Posterior root stimulation
Gamma neuron facilitation
Correct Answer:
Tissue compression
Explanation:
Bleeding forms a hematoma that compresses brain tissue, raises pressure, reduces perfusion, and damages neurons.
MCQ 18
Question:
A patient has spastic paraplegia with exaggerated reflexes, but no fasciculations. Which pathway is most likely damaged?
Options:
Corticospinal tract
Anterior horn cell
Peripheral motor nerve
Neuromuscular junction
Muscle fiber membrane
Correct Answer:
Corticospinal tract
Explanation:
Spastic paraplegia with hyperreflexia reflects UMN pathway damage, especially corticospinal tract involvement.
MCQ 19
Question:
Which feature most strongly supports lower motor neuron involvement rather than upper motor neuron involvement?
Options:
Clonus
Babinski sign
Marked fasciculation
Increased tone
Brisk reflexes
Correct Answer:
Marked fasciculation
Explanation:
Fasciculations occur due to spontaneous activity of damaged lower motor neurons and are typical of LMN lesions.
MCQ 20
Question:
A spinal cord lesion interrupts descending control but leaves the reflex arc structurally intact. Which clinical outcome is most likely after the acute phase?
Options:
Areflexia with fasciculations
Spasticity with hyperreflexia
Flaccidity with denervation
Ataxia with nystagmus
Rigidity with resting tremor
Correct Answer:
Spasticity with hyperreflexia
Explanation:
When descending control is lost but the spinal reflex arc remains intact, reflexes become exaggerated, producing UMN signs after spinal shock resolves.
📌 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.