Q. 1
Medical Sciences
Difficulty: Easy
(1 Mark)
Under the Expanded Programme on Immunization (EPI) in Pakistan, which vaccine is administered at birth along with OPV-0 and Hepatitis B?
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Step-by-Step Explanation & Concept Rationale
At birth, infants in Pakistan receive BCG (intradermal, against tuberculosis), Oral Polio Vaccine (OPV-0), and the birth dose of Hepatitis B vaccine.
Q. 2
Medical Sciences
Difficulty: Easy
(1 Mark)
The Pentavalent vaccine in Pakistan's EPI schedule provides combined protection against which five infectious diseases?
💡
Step-by-Step Explanation & Concept Rationale
Pentavalent vaccine immunizes against Diphtheria, Pertussis (whooping cough), Tetanus, Hepatitis B, and Haemophilus influenzae type b (Hib), administered at 6, 10, and 14 weeks.
Q. 3
Medical Sciences
Difficulty: Easy
(1 Mark)
Which vector is responsible for the transmission of Dengue virus, Chikungunya, and Zika virus in Pakistan?
💡
Step-by-Step Explanation & Concept Rationale
Aedes mosquitoes (primarily Aedes aegypti) are day-biting vectors that breed in clean, artificial water collections and transmit Dengue, Yellow fever, Chikungunya, and Zika.
Q. 4
Medical Sciences
Difficulty: Medium
(1 Mark)
In epidemiology, the proportion of truly diseased individuals who test positive on a screening test is termed:
💡
Step-by-Step Explanation & Concept Rationale
Sensitivity represents true-positive rate: the ability of a screening test to correctly identify individuals who actually possess the disease [TP / (TP + FN)].
Q. 5
Medical Sciences
Difficulty: Medium
(1 Mark)
Which epidemiological study design is best suited for investigating rare diseases or diseases with long latency periods?
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Step-by-Step Explanation & Concept Rationale
Case-control studies identify individuals with the disease (cases) and without (controls) and look backwards for exposure; they are economical and ideal for studying rare conditions.
Q. 6
Medical Sciences
Difficulty: Easy
(1 Mark)
Maternal Mortality Ratio (MMR) is standardly defined in public health statistics as maternal deaths per how many live births?
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Step-by-Step Explanation & Concept Rationale
The Maternal Mortality Ratio is calculated as the number of resident maternal deaths resulting from the pregnancy process per 100,000 live births during a specified year.
Q. 7
Medical Sciences
Difficulty: Medium
(1 Mark)
In municipal water purification, what is the recommended minimum free residual chlorine level required at the consumer's tap after 30 minutes of contact time?
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Step-by-Step Explanation & Concept Rationale
WHO and national drinking water standards prescribe a minimum free residual chlorine concentration of 0.5 mg/L (ppm) after at least 30 minutes of contact time at pH < 8.0.
Q. 8
Medical Sciences
Difficulty: Easy
(1 Mark)
Which of the following describes 'Cold Chain' in public health practice?
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Step-by-Step Explanation & Concept Rationale
The vaccine cold chain is a continuous network of refrigerators, cold boxes, and icepacks ensuring potent vaccines are kept between +2°C and +8°C from factory to administration.
Q. 9
Medical Sciences
Difficulty: Medium
(1 Mark)
The definitive diagnostic test for pulmonary tuberculosis endorsed by the WHO for rapid detection of Mycobacterium tuberculosis and rifampicin resistance is:
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Step-by-Step Explanation & Concept Rationale
GeneXpert MTB/RIF is an automated real-time PCR assay providing simultaneous detection of Mycobacterium tuberculosis and rifampicin-resistance mutations within two hours.
Q. 10
Medical Sciences
Difficulty: Easy
(1 Mark)
In Pakistan, the Lady Health Worker (LHW) Programme primarily operates at which level of the healthcare delivery system?
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Step-by-Step Explanation & Concept Rationale
Initiated in 1994, Pakistan's Lady Health Workers operate at the grassroots primary community tier, providing basic maternal, child, family planning, and immunization outreach services.
Q. 11
Medical Sciences
Difficulty: Easy
(1 Mark)
The primary reservoir of infection for Poliovirus in nature is:
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Step-by-Step Explanation & Concept Rationale
Poliovirus infects only human beings; there is no animal reservoir or long-term carrier state, making global eradication biologically feasible.
Q. 12
Medical Sciences
Difficulty: Easy
(1 Mark)
Which index measures the number of infant deaths (<1 year of age) per 1,000 live births in a given year?
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Step-by-Step Explanation & Concept Rationale
Infant Mortality Rate (IMR) is a fundamental indicator of population health and socio-economic development, calculated per 1,000 live births.
Q. 13
Medical Sciences
Difficulty: Medium
(1 Mark)
Oral Rehydration Salt (ORS) solution recommended by the WHO for acute watery diarrhea has an osmolarity of approximately:
💡
Step-by-Step Explanation & Concept Rationale
The reduced-osmolarity WHO ORS formulation has total osmolarity of 245 mOsm/L (75 mmol/L Na+, 75 mmol/L glucose), reducing stool output and vomiting.
Q. 14
Medical Sciences
Difficulty: Easy
(1 Mark)
In occupational health, pneumoconiosis caused by long-term inhalation of crystalline silica dust in stone carvers, miners, and quarry workers is termed:
💡
Step-by-Step Explanation & Concept Rationale
Silicosis results from inhalation of fine silica dust, producing nodular pulmonary fibrosis and markedly predisposing to active tuberculosis (silicotuberculosis).
Q. 15
Medical Sciences
Difficulty: Easy
(1 Mark)
Which prevention level is illustrated by immunizing children against measles through the EPI program?
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Step-by-Step Explanation & Concept Rationale
Primary prevention takes action prior to the onset of disease, removing possibility that a disease will occur (e.g., active immunization).
Q. 16
Medical Sciences
Difficulty: Easy
(1 Mark)
Which measure of disease occurrence represents the number of NEW cases occurring in a population during a specified period of time?
💡
Step-by-Step Explanation & Concept Rationale
Incidence quantifies the rate of development of new cases in a population initially at risk, while prevalence measures total existing cases at a given time.
Q. 17
Medical Sciences
Difficulty: Medium
(1 Mark)
The primary vector for the transmission of cutaneous and visceral Leishmaniasis in Pakistan is the female:
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Step-by-Step Explanation & Concept Rationale
Phlebotomine sandflies (such as Phlebotomus sergenti in cutaneous leishmaniasis) transmit the protozoan parasite Leishmania.
Q. 18
Medical Sciences
Difficulty: Easy
(1 Mark)
Directly Observed Treatment, Short-course (DOTS) is the internationally recognized strategy for the control of:
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Step-by-Step Explanation & Concept Rationale
DOTS is the cornerstone of the WHO Global Tuberculosis Programme, ensuring patient compliance by direct observation of medication intake.
Q. 19
Medical Sciences
Difficulty: Easy
(1 Mark)
Which contraceptive method provides dual protection by both preventing pregnancy and reducing transmission of Sexually Transmitted Infections (STIs) including HIV?
💡
Step-by-Step Explanation & Concept Rationale
Latex barrier condoms are the only contraceptive method clinically proven to offer concurrent protection against unintended pregnancy and STIs/HIV.
Q. 20
Medical Sciences
Difficulty: Easy
(1 Mark)
What is the primary indicator utilized by public health authorities to assess the bacteriological safety and fecal contamination of drinking water?
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Step-by-Step Explanation & Concept Rationale
E. coli is the universal indicator organism for fecal pollution in water because it is an obligate inhabitant of the human and warm-blooded animal intestine.
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