General Science/Everyday Science MCQs
Topic Notes: General Science/Everyday Science
MCQs and preparation resources for competitive exams, covering important concepts, past papers, and detailed explanations.
Plato
- Biography: Ancient Greek philosopher (427–347 BCE), student of Socrates and teacher of Aristotle, founder of the Academy in Athens.
- Important Ideas:
- Theory of Forms
- Philosopher-King
- Ideal State
11
Which 'valvular' lesion is associated with a 'Mid-systolic click' followed by a late systolic murmur?
Answer:
Mitral Valve Prolapse (MVP)
MVP occurs when the mitral valve leaflets bulge into the left atrium during contraction. The 'click' is caused by the sudden tensing of the chordae tendineae as the valve prolapses.
12
Which marker is most likely to be elevated in 'Medullary Thyroid Cancer'?
Answer:
Calcitonin
Medullary thyroid cancer arises from the parafollicular C-cells of the thyroid, which produce calcitonin. Therefore, serum calcitonin is a sensitive marker for both diagnosis and monitoring.
13
Which imaging modality is the gold standard for diagnosing a 'Subarachnoid Hemorrhage' in the acute phase?
Answer:
Non-contrast CT Head
A non-contrast CT scan is the first-line and highly sensitive test for acute subarachnoid hemorrhage, appearing as hyperdense (white) areas in the subarachnoid spaces.
14
What is the diagnostic significance of a 'Positive Babinski Sign' in an adult?
Answer:
Upper Motor Neuron lesion
In an adult, the upward movement of the big toe (fanning) upon stimulation of the sole is abnormal and indicates damage to the corticospinal tract (an Upper Motor Neuron lesion).
15
Which condition is characterized by 'currant jelly stools'?
Answer:
Intussusception
Intussusception occurs when one part of the intestine slides into another. The 'currant jelly' appearance of the stool is caused by a mixture of mucus and blood from the compromised intestinal lining.
16
Which physical finding is associated with 'Primary Biliary Cholangitis' (PBC)?
Answer:
Anti-Mitochondrial Antibodies (AMA)
While not a physical finding, AMA is the hallmark diagnostic marker for PBC. Physical signs can include pruritus (itching), jaundice, and xanthomas (cholesterol deposits under the skin).
17
Which diagnostic test is used to confirm 'Pernicious Anemia' by checking for specific antibodies?
Answer:
Anti-Intrinsic Factor Antibody
Pernicious anemia is an autoimmune condition where the body attacks parietal cells or intrinsic factor. Testing for anti-intrinsic factor antibodies is highly specific for this diagnosis.
18
What is the primary cause of 'Acromegaly' in adults?
Answer:
Growth Hormone-secreting Pituitary Adenoma
Acromegaly is caused by an overproduction of Growth Hormone (GH) after the epiphyseal plates have closed. This is almost always due to a benign tumor of the pituitary gland.
19
Which screening test is recommended for 'Colorectal Cancer' beginning at age 45 for average-risk individuals?
Answer:
Fecal Occult Blood Test or Colonoscopy
Colonoscopy is considered the gold standard for both detection and prevention (via polyp removal). Stool-based tests like FIT or gFOBT are also effective screening options.
20
Which clinical finding is most suggestive of 'Left Heart Failure' rather than Right?
Answer:
Pulmonary Crackles (Rales)
Left heart failure causes blood to back up into the pulmonary circulation, leading to pulmonary congestion and crackles. Right heart failure causes blood to back up into the systemic circulation, leading to edema and JVD.