AIIMS/ NEET-PG 2017 Community Medicine MCQs 11-20

Q-11. A test has high false positive rate in a community, true is
a) High specificity
b) High sensitivity
c) High prevalence
d) Low prevalence

Answer: Low prevalence
Explanation:
In a population with a low prevalence of a particular disease it is likely that most of the positive results in a screening program for that disease would be falsely positive.

Q-12. Weight of Indian reference man in kg
a) 55
b) 60
c) 50
d) 45

Answer: 60
Explanation:
Reference Body Weights of Indians
Employed for Computing RDA, 2009:
Adult man:
Age-18-29 years
Reference Body Weight (kg)-60.0
Adult woman:
Age: 18-29 years
Reference Body Weight (kg)-55

Q-13. Chlorine demand of water is measured by
a) Horrock’s apparatus
b) Chlorimeter
c) Double pot
d) Berkfeld filter

Answer: Horrock’s apparatus
Explanation:
Horrock’s apparatus is designed to find out the dose of bleaching powder (chlorine) required for disinfection of water.

Q-14. Which of the following diseases is not included in “Vision 2020 – Right to Sight” immediate goals?
a) Trachoma
b) Epidemic conjunctivitis
c) Cataract
d) Onchocerciasis

Answer: Epidemic conjunctivitis
Explanation:
VISION 2020 programmes use an integrated approach to eliminating the main causes of avoidable blindness by the year 2020 based on three core strategies

  1. Human Resource Development
  2. Infrastructure Development
  3. Disease Control.
    Disease Control:
    Cataract
    Trachoma
    Onchocerciasis (River Blindness)
    Refractive error and low vision care
    Childhood blindness
    Vision 2020 has identified certain conditions which require immediate attention in India. These are cataract, childhood blindness, refractive errors and low vision, corneal blindness, diabetic retinopathy and glaucoma.

Q-15. Which of the following statements about lepromin test is not true?
a) It is negative in most children in first 6 months of life
b) It is a diagnostic test
c) It is an important aid to classify type of leprosy disease
d) BCG vaccination may convert lepra reaction from negative to positive

Answer: It is a diagnostic test
Explanation:
Lepromin reaction:
The test is not a diagnostic test.
The test has been generally accepted as a useful tool in evaluating the immune status of leprosy patients.
The test is also of great value in estimating the prognosis in cases of leprosy of all type.
BCG vaccination is capable of converting the lepra reaction from the negative to positive in large population of individuals.

Q-16. Disease not transmitted by lice is
a) Relapsing fever
b) Trench fever
c) Q- fever
d) Epidemic typhus

Answer: Q- fever
Explanation:
Diseases transmitted by lice:
Relapsing fever
Trench fever
Epidemic typhus
Pediculosis
Diseases transmitted by soft ticks:
Q- Fever
Relapsing fever

Q-17. Chikungunya is transmitted by
a) Aedes
b) Culex
c) Mansonoides
d) Anopheles

Answer: Aedes
Explanation:
Aedes born diseases:
Dengue fever
Chikungunya fever
Rift valley fever
Yellow fever

Q-18. In a study following interpretation are obtained; satisfied, very satisfied, dissatisfied which type of scale is this?
a) Nominal
b) Ordinal
c) Interval
d) Ratio

Answer: Ordinal
Explanation:
Statistical data:
Qualitative data:
Qualitative data can be arranged into categories that are not numerical.
These categories can be physical traits, gender, colors or anything that does not have a number associated to it as they cannot be measured.
The qualitative data can be placed on two scales:
Nominal: Qualitative data can be arranged into categories such as male/ female, black/ white etc.
Ordinal: Qualitative data can be arranged into categories that can be rank ordered (Students may be ranked in grades A/B/C).
Quantitative data:
Have magnitude and can be measured.
The quantitative data can be measured on two scales:
Interval
Ratio scale

Q-19. Treatment of choice for sputum positive pulmonary tuberculosis detected in first trimester of pregnancy
a) Defer till second trimester
b) Start cat I immediately
c) Start cat II immediately
d) Start cat III immediately

Answer: Start cat I immediately
Explanation:
Sputum positive pulmonary tuberculosis→ (Cat I)
First line drug can be safely used in pregnancy except streptomycin (Oto-toxicity)
Second line drugs are not recommended in pregnancy.
Breast feeding is not contraindicated in women using ATT.

Q-20. Safe disposal of mercury is
a) Collect carefully and recycle
b) Controlled combustion
c) Treatment with chemicals
d) Deep burial

Answer: Collect carefully and recycle
Explanation:
Mercury-containing items should be treated as hazardous materials and should not be thrown in the garbage and liquid mercury should never be poured down the drain.
All mercury-containing items should be recycled.