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
31
Which test is considered the most reliable for diagnosing 'Acute Myocardial Infarction' within the first 6 hours?
Answer:
Troponin I
High-sensitivity Troponin assays can detect myocardial injury within 2–4 hours of symptom onset. While an ECG may show ST-elevation (STEMI), troponins are necessary to diagnose Non-ST-elevation MI (NSTEMI).
32
Which condition is characterized by 'painless hematuria' in an older adult smoker?
Answer:
Bladder Cancer
Painless gross hematuria in an older patient, especially with a smoking history, is highly suspicious for malignancy of the urinary tract (bladder or renal cell carcinoma) until proven otherwise.
33
What is the characteristic 'chest pain' description for 'Pericarditis'?
Answer:
Sharp pain that improves when leaning forward
Pericarditic pain is typically pleuritic (sharp and worse with breathing), but characteristically it is relieved by sitting up and leaning forward, which reduces the pressure of the heart against the pericardium.
34
Which diagnostic test is used to measure 'Glomerular Filtration Rate' (GFR) most accurately in clinical practice?
Answer:
Creatinine Clearance
While estimated GFR (eGFR) is commonly used based on serum creatinine, a 24-hour urine collection for Creatinine Clearance provides a more direct (though cumbersome) measurement of renal filtration function.
35
Which physical finding is associated with 'Chronic Liver Disease' and high estrogen levels?
Answer:
Spider Angiomas
Spider angiomas, palmar erythema, and gynecomastia in men are physical signs of cirrhosis caused by the liver's inability to metabolize estrogen properly.
36
A 'Positive Coombs Test' (Direct Antiglobulin Test) is used to diagnose which type of anemia?
Answer:
Autoimmune Hemolytic Anemia
The direct Coombs test detects antibodies or complement proteins that are already bound to the surface of red blood cells, indicating an immune-mediated destruction of those cells.
37
Which infectious agent is the most common cause of 'Urinary Tract Infections' (UTIs)?
Answer:
Escherichia coli
E. coli, a bacterium commonly found in the lower gastrointestinal tract, is responsible for approximately 75–95% of uncomplicated urinary tract infections.
38
The 'Urea-to-Creatinine Ratio' is often elevated (>20:1) in which type of Acute Kidney Injury (AKI)?
Answer:
Prerenal AKI
In prerenal AKI (caused by decreased blood flow to the kidney), the kidney's tubule function is intact, allowing for increased reabsorption of urea relative to creatinine, resulting in a high ratio.
39
Which laboratory finding is typical for 'Addison's Disease' (Primary Adrenal Insufficiency)?
Answer:
Hyponatremia and Hyperkalemia
Addison's disease involves the loss of aldosterone and cortisol. Loss of aldosterone leads to sodium wasting (hyponatremia) and potassium retention (hyperkalemia), often accompanied by low blood pressure.
40
In the diagnosis of 'COPD', what is the significance of the 'Alpha-1 Antitrypsin' test?
Answer:
To identify a genetic cause of early-onset emphysema
Alpha-1 antitrypsin deficiency is a genetic disorder that can cause lung disease (emphysema) and liver disease. It should be suspected in young patients who develop COPD without a significant smoking history.