KMU Past Paper Practice

Question:

A 24-year-old man uses the same stimulant by two different routes on separate occasions. He reports a much stronger urge to repeat the dose when the drug produces an almost immediate effect. Which property most strongly increases the reinforcing potential in this situation?

Correct Answer: Rapid delivery of the drug to the brain

Explanation: Rapid CNS delivery creates a close temporal link between drug-taking and reward, strengthening reinforcement and encouraging repeated use.

Question:

A young adult becomes markedly drowsy after taking a recreational substance at a nightclub. He develops profound sedation and depressed breathing rather than agitation or hallucinations. Which club drug best fits this presentation?

Correct Answer: GHB

Explanation: GHB is a CNS depressant; excessive exposure can cause profound sedation, impaired consciousness and respiratory depression.

Question:

A 22-year-old woman is found confused after a party. She recalls arriving at the venue but has little memory of later events. A sedative club drug acting through enhanced GABA-mediated inhibition is suspected. Which substance is most consistent with these findings?

Correct Answer: Flunitrazepam

Explanation: Flunitrazepam and related sedatives enhance GABA-mediated inhibition and can produce marked sedation, psychomotor impairment and amnesia.

Question:

A student repeatedly takes a recreational drug because of vivid perceptual changes. He stops using it without developing the marked autonomic or physical withdrawal expected with alcohol or opioids. Which substance best fits this pattern?

Correct Answer: LSD

Explanation: Hallucinogens such as LSD can be misused repeatedly but typically have much less prominent physical dependence and withdrawal than alcohol, opioids or nicotine.

Question:

A smoker who wishes to quit is prescribed a non-nicotine medicine that reduces craving through effects on catecholamine neurotransmission. Which pharmacological action best describes this drug?

Correct Answer: Inhibition of noradrenaline and dopamine reuptake

Explanation: Bupropion inhibits noradrenaline and dopamine reuptake and reduces nicotinic signalling, thereby decreasing nicotine craving and withdrawal symptoms.

Question:

A man stops smoking cigarettes and develops irritability, poor concentration and strong craving. He is offered patches as part of cessation treatment. Which principle best explains their usefulness?

Correct Answer: They provide controlled nicotine without continued tobacco exposure

Explanation: Nicotine replacement reduces withdrawal and craving while separating nicotine delivery from the harmful components and behavioural pattern of smoking.

Question:

A man drinks heavily over a short period. Once his blood ethanol concentration is high, the metabolic pathway handling most ethanol is operating near capacity. Which elimination pattern is therefore expected over the clinically relevant range?

Correct Answer: A relatively constant amount is removed per unit time

Explanation: Saturation of the major ethanol-metabolizing pathway makes elimination approximate zero-order kinetics, with a relatively constant amount removed per unit time.

Question:

Shortly after absorption, ethanol produces neurological effects because it readily reaches the brain. Which pharmacokinetic property best explains its distribution in the body?

Correct Answer: Distribution mainly through total body water

Explanation: Ethanol is a small water-soluble molecule that distributes widely through body water and readily enters the CNS.

Question:

A poorly nourished man consumes a large quantity of alcohol after prolonged fasting and later becomes confused and sweaty. His blood glucose is low. Which metabolic effect of ethanol contributes most directly to this problem?

Correct Answer: Impairment of hepatic gluconeogenesis

Explanation: Ethanol metabolism alters the hepatic redox state and can impair gluconeogenesis, making fasting or malnourished individuals vulnerable to hypoglycaemia.

Question:

A man with prolonged heavy alcohol intake develops hepatic fatty change. There is no evidence of another liver disorder. Which pharmacological-metabolic effect of ethanol most directly contributes to this early hepatic abnormality?

Correct Answer: Alteration of hepatic redox and lipid metabolism

Explanation: Ethanol oxidation alters hepatic redox balance and lipid handling, promoting triglyceride accumulation and fatty liver during chronic heavy exposure.

Question:

A severely intoxicated patient initially appeared talkative and disinhibited but later becomes deeply drowsy with slow breathing. Which interpretation best explains this progression?

Correct Answer: Increasing exposure produces progressive CNS depression

Explanation: Early apparent stimulation reflects reduced inhibition and impaired judgement; increasing ethanol exposure produces deeper CNS and eventually respiratory depression.

Question:

A psychoactive drug produces an intense effect within seconds but the rewarding effect fades rapidly. The user consequently takes repeated doses during the same session. Which combination most strongly promotes this pattern?

Correct Answer: Rapid onset with short-lived reinforcement

Explanation: Rapid reward strongly reinforces drug-taking, while a short duration encourages repeated dosing to reproduce the desired effect.

Question:

A person repeatedly uses a psychoactive substance mainly because of a strong psychological desire and established habit. Marked physical withdrawal is not a dominant feature when the substance is stopped. Which older pharmacological term best describes this pattern?

Correct Answer: Habituation

Explanation: Habituation is an older term for repeated use driven mainly by psychological desire or habit, with less prominent physical dependence and withdrawal.

Question:

Two recreational substances have very different mechanisms: one is a stimulant with prominent monoamine effects and the other is a CNS depressant. Both are nevertheless described as “club drugs.” What is the best explanation for this classification?

Correct Answer: The term reflects the recreational setting and pattern of use

Explanation: “Club drug” is a social-use category rather than a pharmacological class; substances within it may have very different mechanisms and toxicities.

Question:

A competitive shooter uses a drug before an event to reduce hand tremor and sympathetic symptoms. During training he develops a slow pulse and reduced exercise tolerance. Which drug group has most likely been misused?

Correct Answer: Beta blockers

Explanation: Beta blockers can reduce tremor and sympathetic activity but may cause bradycardia, hypotension and reduced exercise tolerance.

Question:

An athlete with a painful knee injury uses a substance to suppress pain and continues competing despite worsening tissue damage. Which type of drug misuse best explains why the injury may progress unnoticed?

Correct Answer: Opioid analgesic use to mask pain

Explanation: Opioids may allow continued activity by masking pain, potentially worsening an existing injury while also creating a risk of dependence.

Question:

A bodybuilder uses a hormone to change body composition and enhance anabolic effects. He later develops metabolic abnormalities and musculoskeletal complaints. Which performance-enhancing substance is most consistent with this pattern?

Correct Answer: Growth hormone

Explanation: Growth hormone may be misused for anabolic and body-composition effects, but excessive use can produce metabolic and musculoskeletal adverse effects.

Question:

During examination of a person suspected of narcotic intoxication, the physician notes altered consciousness, abnormal pupils and changes in vital signs. These findings suggest a toxidromic pattern but are not specific for one drug. What is the most appropriate interpretation?

Correct Answer: The findings guide suspicion but require supporting evidence

Explanation: Toxidromic findings help direct investigation but are not sufficiently specific to establish a particular substance, dose or medico-legal conclusion by themselves.

Question:

A forensic team is planning toxicological sampling in a suspected drug-related case. The available questions include recent exposure, possible poisoning and postmortem interpretation. Which principle should primarily determine the choice of biological specimen?

Correct Answer: The specific forensic question being investigated

Explanation: Specimen selection depends on what must be established, such as recent exposure, poisoning or postmortem drug interpretation.

Question:

A previously reliable employee becomes increasingly preoccupied with obtaining and using a psychoactive substance. He stops attending social activities, neglects work responsibilities and spends most of his time planning the next opportunity to use the drug. Which psychological effect of dependence is best demonstrated?

Correct Answer: Narrowing of interests around drug-seeking behaviour

Explanation: Dependence may progressively shift attention and behaviour toward obtaining and using the substance while occupational, social and family responsibilities are neglected.