10 - AIIMS november 2002 community medicine mcqs - part 4

15q: as per the world health organization guidelines, iodine deficiency disorders are endemic in a community if the prevalence of goiter in school age children is more than ?

a. 1 %
b. 5 %
c. 10 %
d. 15 %

answer b. 5 %

16q: a 46 year old female presented at the eye OPD in a hospital. Her vision in the right eye was 6/60 and in the left eye is 3/60. under the national programme for control of blindness, she will be classified as ?

a. socially blind
b. low vision
c. economically blind
d. normal vision

answer b. low vision

17q: the visual acuity used as a cut off for differentiating “normal” from “abnormal” children in the school vision screening programme in India is ?

a. 6/6
b. 6/9
c. 6/12
d. 6/90

answer b. 6/9

18q: when a diagnostic test is used in series mode then ?

a. sensitivity increases but the specificity decreases
b. specificity increases but the sensitivity decreases
c. both sensitivity and specificity decreases
d. both sensitivity and specificity increases

answer b. specificity increases but the sensitivity decreases

19q: the active immunity offered by tetanus toxoid is effective in nearly ?

a. 25 % of patients
b. 50 % of patients
c. 75 % of patients
d. 100 % of patients

answer d. 100 %

9 - AIIMS november 2002 community medicine mcqs - part 3

11q: prevalence of a disease :

a. is the best measure of the disease frequency in etiological studies
b. can only be determined by a cohort study
c. is the number of new cases in a defined population
d. describes the balance between incidence,mortality and recovery

answer d. describes the balance between incidence,mortality and recovery

12q: in a controlled trial to compare two treatments , the main purpose of randomization is to ensure that :

a. the two groups will be similar in prognostic factors
b. the clinician does not know which treatment the subjects will receive
c. the sample may be referred to a known population
d. the clinician can predict in advance which treatment the subjects will receive

answer a. the two groups will be similar in prognostic factors

13q: a randomized trial comparing the efficacy of two drugs showed a difference between the two with a p value of less than 0.005. in reality however the two drugs do not differ . this is therefore an example of ?

a. type 1 error ( alpha error )
b. type 2 error ( beta error )
c. 1- alpha
d. 1- beta

answer a. type 1 error ( alpha error )

14q: the number of patients required in a clinical trial to treat a specific disease increases as :

a. the incidence of the disease decreases
b. the significance level increases
c. the size of the expected treatment effect increased
d. the drop out rate increases

answer d. the drop out rate increases

8 - AIIMS november 2002 community medicine mcqs - part 2

6q: all of the following statements are true about DPT vaccine except ?

a. it should be stored in deep freezer
b. exposure to direct sunlight, when in use should be avoided
c. store stocks are needed for three months at PHC level
d. half-used vials should not be put back into the cold chain after the session

answer a. it should be stored in deep freezer

7q: the preferred public health approach to control non-communicable diseases is ?

a. shift the population curve of risk factors by a population based approach
b. focus on high risk individuals for reduction of risk
c. early diagnosis and treatment of identified cases
d. individual disease based vertical programmes

answer a. shift the population curve of risk factors by a population based approach

8q: all of the following are true for occupational lead poisoning except ?

a. inhalation is the most common mode of absorption
b. lead in blood and urine provide quantitative indicators of exposure
c. average blood is more important than number of subjects with blood levels above threshold
d. basophilic stippling is a sensitive parameter of hematological response

answer c. average blood is more important than number of subjects with blood levels above threshold

9q: in community needs assessment approach , as part of the reproductive and child health programme, the targets for various health activities are set at the level of ?

a. community
b. sub-center
c. primary health centre
d. district

answer d. district

10q: in a case control study of a suspected association between breast cancer and the contraceptive pill . all of the following are true statements except ?

a. the control should come from a population that has the same potential for breast cancer as the cases
b. the control should exclude women known to be taking the pill at the time of survey
c. all the controls need to be healthy
d. the attributable risk of breast cancer resulting from the pill may be directly measured

answer d. the attributable risk of breast cancer resulting from the pill may be directly measured