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
21
Which organ system provides the body's framework and protects internal organs?
Answer:
Skeletal
The skeletal system includes all bones and joints. It provides leverage for movement, a structure for muscle attachment, and shields vital organs like the brain, heart, and lungs.
22
Which part of the ear is responsible for maintaining equilibrium and balance?
Answer:
Semicircular canals
The semicircular canals in the inner ear contain fluid and hair cells that detect head movement and rotation, sending signals to the brain to maintain balance.
23
The structural protein that makes up hair and nails is:
Answer:
Keratin
Hard keratin is the primary component of hair and nails, providing them with rigidity and resistance to decay and environmental damage.
24
What is the primary function of the thymus gland?
Answer:
Mature T-lymphocytes
The thymus is most active during childhood and adolescence. It 'trains' T-cells to identify pathogens and prevents them from attacking the body's own tissues.
25
Which hormone is produced by the ovaries and is responsible for female secondary sex characteristics?
Answer:
Estrogen
Estrogens stimulate the development of breasts, wider hips, and the distribution of body fat characteristic of females, and they play a key role in the menstrual cycle.
26
The central nervous system is protected by three layers of membranes called:
Answer:
Meninges
The meninges consist of the dura mater (outer), arachnoid mater (middle), and pia mater (inner). They protect the brain and spinal cord and contain cerebrospinal fluid.
27
Which organ produces the majority of the body's digestive enzymes?
Answer:
Pancreas
The pancreas secretes a cocktail of enzymes into the small intestine that break down all major food groups: proteins (trypsin), carbohydrates (amylase), and fats (lipase).
28
Which blood type is known as the 'Universal Donor'?
Answer:
Type O
Type O blood (specifically O negative) lacks A and B antigens on the surface of red blood cells, meaning it can be given to patients of any blood type without causing an immediate immune reaction.
29
The primary site of gas exchange in the lungs is the:
Answer:
Alveoli
The alveoli provide a massive surface area (approximately 70-100 square meters) and a very thin membrane that facilitates the rapid diffusion of O2 and CO2.
30
What is the function of the sebaceous glands in the skin?
Answer:
Produce oil (sebum) to lubricate skin and hair
Sebaceous glands are exocrine glands that secrete sebum. Sebum helps waterproof the skin, keep it supple, and possesses mild antibacterial properties.