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
51
The primary function of white blood cells (leukocytes) is to:
Answer:
Protect the body against pathogens
White blood cells are the cells of the immune system. They include neutrophils, lymphocytes, monocytes, eosinophils, and basophils, all working to identify and eliminate foreign substances and infections.
52
Which part of the brain controls vital involuntary functions such as heart rate and breathing?
Answer:
Medulla oblongata
The medulla oblongata is part of the brainstem. It contains autonomic centers that regulate heart rate, blood pressure, and the rhythm of breathing.
53
Which of the following is an example of an exocrine secretion of the pancreas?
Answer:
Digestive enzymes
The pancreas has both endocrine and exocrine functions. Its exocrine function involves secreting pancreatic juice (containing enzymes like amylase, lipase, and proteases) into the duodenum via the pancreatic duct.
54
Which endocrine gland regulates sleep-wake cycles through the production of melatonin?
Answer:
Pineal gland
The pineal gland, located in the brain, secretes melatonin in response to darkness. This hormone helps regulate the body's internal clock (circadian rhythm).
55
The tough, outer protective layer of a bone is called the:
Answer:
Periosteum
The periosteum is a dense fibrous membrane covering the surface of bones. it contains blood vessels and nerves that nourish the bone and provides attachment points for tendons and ligaments.
56
Which organ is responsible for the detoxification of various metabolites and the synthesis of plasma proteins?
Answer:
Liver
The liver is a vital metabolic organ that processes nutrients, breaks down toxins (like alcohol and drugs), and produces essential proteins like albumin and clotting factors.
57
What is the primary role of the hemoglobin molecule in red blood cells?
Answer:
Transport oxygen
Hemoglobin is an iron-containing protein that binds to oxygen molecules in the lungs and releases them in the tissues. It also helps transport some carbon dioxide back to the lungs.
58
Which heart valve is located between the left atrium and the left ventricle?
Answer:
Bicuspid (Mitral) valve
The mitral valve (or bicuspid valve) has two flaps. It allows blood to flow from the left atrium into the left ventricle and prevents backflow during ventricular systole.
59
In the urinary system, the tubes that carry urine from the kidneys to the bladder are the:
Answer:
Ureters
The ureters are two thin tubes that use peristaltic contractions to move urine from the renal pelvis of the kidneys down to the urinary bladder for storage.
60
Which part of the eye contains the photoreceptors (rods and cones)?
Answer:
Retina
The retina is the innermost, light-sensitive layer of the eye. Rods are sensitive to low light levels, while cones are responsible for color vision and high-acuity tasks.