Q. If a vaccine reduces the risk of infection by 75%, what is the probability of infection after vaccination if the initial probability of infection is 0.2? (2020)
A.
0.05
B.
0.1
C.
0.15
D.
0.2
Solution
The probability of infection after vaccination = Initial probability × (1 - reduction) = 0.2 × (1 - 0.75) = 0.2 × 0.25 = 0.05.
Q. If a vaccine reduces the risk of infection by 75%, what is the probability of infection after vaccination if the initial probability of infection is 0.1? (2020)
A.
0.025
B.
0.075
C.
0.1
D.
0.5
Solution
The new probability of infection after vaccination = Initial probability × (1 - reduction) = 0.1 × (1 - 0.75) = 0.1 × 0.25 = 0.025.
Q. In a clinical trial, 60% of patients showed improvement after treatment. If 150 patients were treated, how many patients are expected to show improvement? (2022)
Q. In a study, 60% of patients with a certain disease reported fatigue. If 50 patients were surveyed, how many would you expect to report fatigue? (2022)
A.
20
B.
30
C.
40
D.
50
Solution
Expected number of patients reporting fatigue = 50 × 0.6 = 30.
Q. In a study, 60% of patients with a certain disease were found to have a specific symptom. If 150 patients were studied, how many patients had the symptom? (2023)
A.
60
B.
90
C.
75
D.
100
Solution
Number of patients with the symptom = 60% of 150 = 0.6 × 150 = 90.
Q. In a study, 80% of patients with a certain disease showed improvement after treatment. If 50 patients were treated, how many patients are expected to show improvement? (2023)
Q. What is the probability of a person being diagnosed with a disease if the prevalence of the disease in a population is 2% and the test for the disease has a sensitivity of 90% and a specificity of 95%? (2021)
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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