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
101
Which mineral is most closely associated with the prevention of dental caries when added to water supplies?
Answer:
Fluoride
Fluoride helps prevent tooth decay by promoting the remineralization of enamel and making it more resistant to the acid produced by plaque bacteria. It is widely used in toothpaste and public water fluoridation programs.
102
What is the primary function of Vitamin K in the human body?
Answer:
Blood coagulation
Vitamin K is a critical cofactor for the synthesis of several clotting factors in the liver, including prothrombin (Factor II). Without adequate Vitamin K, the blood cannot clot properly, leading to an increased risk of hemorrhage.
103
Which of the following is considered a 'complete' protein source, containing all nine essential amino acids?
Answer:
Quinoa
While most plant-based proteins are 'incomplete' (missing one or more essential amino acids), quinoa is a notable exception. It contains a balanced profile of all nine amino acids that the human body cannot synthesize on its own.
104
A deficiency in which vitamin is the primary cause of night blindness (nyctalopia)?
Answer:
Vitamin A
Vitamin A (retinol) is essential for the formation of rhodopsin, a pigment in the retina that allows the eye to see in low-light conditions. A prolonged deficiency leads to the inability of the eyes to adapt to darkness.
105
Which macronutrient provides the highest amount of energy per gram?
Answer:
Fats
Fats are the most energy-dense macronutrient, providing approximately 9 calories per gram. In contrast, carbohydrates and proteins provide about 4 calories per gram, while fiber provides even less or none depending on its fermentability.