Consider the four age pyramids given below namely A, B, C and D representing four different countries. 
Which one of them indicates the declining population?
UPSC - 2011
To determine which age pyramid indicates a declining population, we need to analyze the shape of each pyramid. A declining population is typically represented by a narrow base, indicating fewer young people, and a wider top, indicating more older individuals.
Correct Option: C) Pyramid C indicates a declining population due to its narrow base and wider top.
The following figure has four curves namely A, B, C and D. Study the figure and answer the item that follows. 
Which curve indicates the exponential growth?
UPSC - 2011
To determine which curve represents exponential growth, we need to understand the characteristics of exponential growth and analyze the curves in the diagram.
Correct Option: D) Curve D indicates exponential growth.
Directions for the following 2 questions
The following pie charts show the break up of disease categories recorded in the patients from two towns. Town A and Town B. Pie charts plot the disease categories as percentage of the total number of patients. Based on these, answer the two items that follow the charts.
Distribution of diseases in Town - A
Distribution of diseases in Town - B 
Which of the towns has a higher number of persons with Diabetes?
UPSC - 2011
Town A
Town B
Same in Town A and Town B
No inference can be drawn
To determine which town has a higher number of persons with Diabetes, we need to consider both the percentage of patients with Diabetes in each town and the total number of patients in each town. However, the total number of patients is not provided, making it impossible to draw a definitive conclusion.
Correct Option: D) No inference can be drawn
What can we say about persons with more than one disease from these graphs ?
UPSC - 2011
There are likely to be persons with more than one disease in Town A.
There are likely to be persons with more than one disease in Town B.
There are likely to be persons with more than one disease in both Towns A and B.
No inference can be drawn
The question asks us to infer the likelihood of persons having more than one disease based on two graphs (presumably showing disease prevalence in Town A and Town B). We need to analyze the information presented in the graphs to determine if there's an overlap or high prevalence of multiple diseases in either town.
Given that option B is the correct answer, it implies that the graph for Town B must have shown a cumulative prevalence of diseases that significantly exceeds 100%, thereby indicating that a substantial portion of the population is likely suffering from more than one disease.
B) There are likely to be persons with more than one disease in Town B. This option is correct because the graph for Town B (which is not provided here but is implied by the question context and correct answer) must have indicated a total disease prevalence exceeding 100% of the population. For example, if Disease 1 affects 60% of the population and Disease 2 affects 70% of the population in Town B, the total is 130%. This means that at least 30% of the population must be suffering from both diseases simultaneously.
Consider the following distance time graph. The graph shows three athletes A, B and C running side by side for a 30 km race. 
With reference to the above graph, consider the following statements:
1. The race was won by A
2. B was ahead of A up to 25 km mark.
3. C ran very slowly from the beginning.
Which of the statements given above is/are correct?
UPSC - 2011
To determine which statements are correct, we need to analyze the distance-time graph provided. The graph shows the performance of three athletes, A, B, and C, in a 30 km race.
Correct Option: B) 1 and 2 only
Directions for the following 3 items
During a party, a person was exposed to contaminated water. A few days later, he developed fever and loose motions. He suffered for some days before going to a doctor for treatment. On starting the treatment, he soon become better and recovered completely a few days later. The following graph shows different phases of the person's disease condition as regions A, B, C, D and E of the curve. Which region/regions of the curve correspond/corresponds to incubation phase of the infection?
UPSC - 2011
A only
B only
B and C
No part of the curve indicates the incubation phase
The incubation phase of an infection is the period between exposure to the pathogen and the onset of symptoms. During this phase, the pathogen is present but not causing noticeable symptoms.
Therefore, the incubation phase corresponds to region A, where there is no significant increase in bacteria count.
Correct Option: A) A only
