Q. A certain disease has a 10% chance of being transmitted from an infected person to a healthy person. If there are 50 infected individuals, what is the expected number of transmissions if each interacts with one healthy person? (2023)
Q. A certain disease has a basic reproduction number (R0) of 2. If one infected person enters a population, how many people could potentially be infected after 3 generations? (2020)
Q. A certain disease has a basic reproduction number (R0) of 3. If one infected person enters a population of 1000, how many people could potentially be infected after one generation? (2021)
A.
300
B.
600
C.
900
D.
1200
Solution
If R0 = 3, then 1 infected person can infect 3 others. Therefore, potential infections = 3 * 1 = 3 people.
Q. If a certain disease has a basic reproduction number (R0) of 3, how many people can one infected person potentially infect in a population without immunity? (2023)
A.
1
B.
2
C.
3
D.
4
Solution
If R0 = 3, one infected person can potentially infect 3 other people in a population without immunity.
Q. If a disease has a 30% chance of being transmitted from an infected person to a healthy person, what is the probability that it will not be transmitted? (2021)
A.
0.7
B.
0.3
C.
0.5
D.
0.2
Solution
The probability that the disease will not be transmitted = 1 - 0.3 = 0.7.
Q. If a disease spreads at a rate of 10% per week, what will be the total percentage of the population infected after 3 weeks, assuming no recovery? (2021)
A.
30%
B.
33%
C.
27%
D.
25%
Solution
Total infected after 3 weeks = 10% + 10% of (100% - 10%) + 10% of (100% - 20%) = 10% + 9% + 8% = 27%.
Q. If a disease spreads at a rate of 3% per week, what will be the total percentage of the population infected after 4 weeks, assuming no recovery? (2021)
A.
12.36%
B.
10.5%
C.
11.5%
D.
15%
Solution
Using the formula for compound growth: Total infected = 100 × (1 - (1 - 0.03)^4) = 100 × (1 - 0.88) = 12.36%.
Q. If a person has a 20% chance of contracting a disease and a 30% chance of recovery, what is the probability that the person will contract the disease and not recover? (2022)
A.
0.14
B.
0.06
C.
0.1
D.
0.2
Solution
Probability of contracting and not recovering = Probability of contracting × (1 - Probability of recovery) = 0.20 × (1 - 0.30) = 0.20 × 0.70 = 0.14.
Q. If a test for a disease has a sensitivity of 90% and a specificity of 95%, what is the probability of a true positive result if the prevalence of the disease is 1%? (2022)
Q. If a test for a disease has a sensitivity of 90% and a specificity of 95%, what is the probability that a person who tests positive actually has the disease, given that the prevalence is 1%? (2022)
Q. If a treatment is effective in 80% of cases, what is the probability that it will be effective for at least one out of three patients? (2023)
A.
0.512
B.
0.8
C.
0.2
D.
0.64
Solution
Probability that treatment is not effective for one patient = 1 - 0.8 = 0.2. For three patients, the probability that it is not effective for all = 0.2^3 = 0.008. Therefore, the probability that it is effective for at least one = 1 - 0.008 = 0.992.
Understanding diseases is crucial for students preparing for various exams. This topic not only forms a significant part of the syllabus but also helps in grasping essential concepts related to health and biology. Practicing MCQs and objective questions on diseases enhances your exam preparation, allowing you to tackle important questions with confidence and improve your scores.
What You Will Practise Here
Types of diseases: infectious, non-infectious, and genetic disorders
Common pathogens: bacteria, viruses, fungi, and parasites
Symptoms and diagnosis of major diseases
Preventive measures and treatment options
Key definitions and terminologies related to diseases
Diagrams illustrating disease mechanisms and transmission
Important case studies and real-life examples
Exam Relevance
The topic of diseases is frequently featured in CBSE, State Boards, NEET, and JEE exams. Students can expect questions that assess their understanding of disease classification, symptoms, and preventive measures. Common question patterns include multiple-choice questions that require students to identify pathogens, match symptoms with diseases, or select appropriate treatment options. Familiarity with these patterns can significantly boost your performance in exams.
Common Mistakes Students Make
Confusing similar diseases due to overlapping symptoms
Neglecting the importance of preventive measures in disease management
Misunderstanding the role of different pathogens in causing diseases
Overlooking key definitions and terminologies that are often tested
Failing to relate theoretical concepts to practical examples
FAQs
Question: What are some common diseases I should focus on for my exams? Answer: Focus on diseases like diabetes, hypertension, tuberculosis, and malaria, as these are frequently asked in exams.
Question: How can I effectively prepare for diseases MCQs? Answer: Regularly practice objective questions, revise key concepts, and use diagrams to visualize disease mechanisms.
Start solving practice MCQs on diseases today to test your understanding and enhance your exam readiness. Remember, consistent practice is the key to success!
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