Junior Health Inspector 2018 Official Paper — Kerala PSC PYQ Practice with Answers
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Paper details
- Paper code: junior-health-inspector-45-2018-ol
- Format: Full previous year paper — PYQ practice with answers
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Preview questions (5)
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Question 51 Public Health
The minimum recommended concentration of free residual chlorine is:
Correct answer: D. 0.5 mg/l for one hour
Correct answer (Option D):\nFor effective disinfection of drinking water under normal conditions, public health guidelines recommend a minimum concentration of 0.5 mg/l of free residual chlorine after a contact time of at least one hour. This ensures destruction of pathogenic bacteria and provides a safeguard against subsequent contamination. Option D is correct.\n\nWhy others are wrong:\nOptions A, B, and C provide incorrect combinations of chlorine concentration and contact time that do not match standard drinking water treatment parameters.\n\nStudy tip:\nDuring epidemics or emergencies, the target residual chlorine level is typically doubled to 1.0 mg/l to handle increased organic loads.
Question 52 Public Health
All are correct about boiling of water except:
Correct answer: D. It offers residual protection
Correct answer (Option D):\nBoiling water does not offer any residual protection. Once the water cools down, it is highly susceptible to re-contamination if stored in unsterile or open containers. Therefore, this statement is the correct exception. Option D is correct.\n\nWhy others are wrong:\nOption A is correct because a rolling boil for 10 to 20 minutes kills bacteria, spores, and cysts. Option B is correct because boiling precipitates calcium bicarbonate, removing temporary hardness. Option C is correct because driving out dissolved gases alters the taste of the water.\n\nRemember:\nUnlike boiling, chemical disinfection methods like chlorination leave a residual concentration that continues to protect water over time.
Question 53 Public Health
All are true about zero dose OPV except:
Correct answer: D. OPV is given after diluting with sterile water
Correct answer (Option D):\nOral Polio Vaccine (OPV) is a liquid, ready-to-use formulation. It must never be diluted with sterile water or any other fluid, as doing so destroys its potency. This makes Option D the false statement and the correct exception. Option D is correct.\n\nWhy others are wrong:\nOption A is true because the standard dosage is two drops. Option B is true because the 'Zero Dose' is administered at birth or within the first 15 days of life. Option C is true because it is administered orally.\n\nStudy tip:\nThe zero dose of OPV aims to overcome maternal antibodies and ensure early intestinal immunity against poliovirus.
Question 54 Public Health
Concurrent disinfection is:
Correct answer: A. Application of disinfective measures as soon as infectious material discharged from the body
Correct answer (Option A):\nConcurrent disinfection is the immediate application of disinfection measures to infectious materials (like stools, urine, sputum, soiled linen) as soon as they are discharged from the patient's body during the course of an active illness. This practice minimizes the spread of pathogens in the immediate environment. Option A is correct.\n\nWhy others are wrong:\nOption B defines terminal disinfection, which is performed after the patient has recovered, died, or been discharged. Options C and D refer to generalized environmental sanitation and basic surgical preparation, respectively.\n\nRemember:\nConcurrent disinfection is vital for containing highly contagious enteric diseases like cholera and typhoid within healthcare setups.
Question 55 General Science
The most common greenhouse gas which is contributing to global warming is:
Correct answer: B. Carbon dioxide
Correct answer (Option B):\nCarbon dioxide ($CO_2$) is the most dominant anthropogenically produced greenhouse gas. Due to the massive scale of fossil fuel combustion and widespread deforestation, its cumulative volume in the atmosphere contributes the largest percentage share to global warming compared to other trace gases. Option B is correct.\n\nWhy others are wrong:\nOption A (Methane) has a higher global warming potential per molecule but is present in much smaller concentrations. Options C and D are highly potent but exist in trace quantities, making their overall volumetric contribution smaller.\n\nRemember:\nWhile water vapour is technically the most abundant greenhouse gas in the atmosphere overall, carbon dioxide is the primary driver of human-induced climate change.
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